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Paper Abstracts of 2010 FENDT
Source:    Publish Time: 2012-01-28 22:49   1840 Views   Size:  16px  14px  12px
【WZ001】Making Codes for Advanced UT MethodsZheng zhenshun, Edward GinzelMaterials Research InstituteAbstract: Advanc

【WZ001】Making Codes for Advanced UT Methods
Zheng zhenshun, Edward Ginzel
Materials Research Institute
Abstract: Advances in ultrasonic testing over the past 10-20 years include the use of Time of Flight Diffraction and Phased array ultrasonic testing. In spite of a nearly 20 year long presence in the industry, these advances are still often not being used even thought they are superior in many ways to the traditional manual UT techniques. The reason they are under-used is primarily due to a lack of codes and standards that engineers can draw on. This presentation will point out some of the issues and illustrate a variety of recent developments in ASTM codes that attempt to address this short-coming.
【WZ002】Recent Progress in Laser ultrasonic Multi-detectors Receivers for non destructing evaluation
A. Wartelle1, B. Pouet1, S. Breugnot1, Bai Xiaobao2
1Bossa Nova Technologies, 2Matrix U/E Technology Inc.
Abstract: New laser interferometric schemes were recently introduced in order to fully take advantage of possibilities offered by laser-based ultrasonic (LBU) inspection and to broaden their integration into industrial inspection systems and laboratories setups. First, we will present the recent advances on a fiberized LBU receiver optimized for industrial applications. We will show an example of results with thickness monitoring on moving sample using zero group velocity Lamb wave resonance. Secondly, we will present the latest progress in a LBU laboratory receiver, with the development of an adaptive interferometer able to measure simultaneously both in-plane and out-of-plane displacements. Advantages of this receiver for the study of ultrasound propagation will be demonstrated with mapping of in-plane and out-of-plane displacements generated by a thermo-elastic laser source.
Keywords: Speckle, ultrasound, quadrature, two-wave mixing, interferometer, laser.
【WZ003】The research of inspection technology for the safety weld of steam generator in radiation
Zhao Lei, Cao Zhijun, Ye Feng, Wang Jiaxu, Mei Yijun, Zhang Tiehui
(Cgnpc Inspection Technology Corporation, Suzhou 215004, china)
Abstract: The safety weld of steam generator located in the SG (steam generator) room, it is an area of high dose level. The pipeline has a major diameter and thick tube skin, and it’s a cast. So it’s hard to inspect with other NDT methods, such as ultrasound. We choose radiation to detect the weld, it only need to place the radioactive source in the right position, then the inspector can leave, when the exposure is ended, he can go into the SG room and take out the film. During the process, the inspectors don’t need to stay in the room too long, and we can evaluate the quality of the weld through the film, so it’s more adaptive than ultrasound. The article describes the main points of inspecting the safety weld with RT method, it is proved the correctness and reliability by the practice in the Ling Ao Nuclear Power Station, and we express the improved methods and views for the testing in service at last.
Keywords: Nuclear Power Station, The safety weld of steam generator, radiation testing, γ-ray
Cai Hongsheng
(Henan Electric Power Research Institute)
Abstract: This paper discussed about the modal of ultrasonic guided waves characteristic in the thick-walled pipe, the guided wave probe was selected, we selected the probe test frequency and tuning angle. Experiments were carried out on pipe samples and the result shown that the method was feasible. This method can effectively detect the inside and outside surface notch with 1.5mm depth and 0.2mm width, and Ultrasonic guided wave inspection is much more efficient than traditional point-by-point examination.
Keywords: Ultrasonic Guided wave, thick-walled pipe, high frequency
【WZ005】Feasibility test research of pressure vessel On-stream inspection
Cao Huai-xiang, Yuan Tao, Wang Chun-mao, Zhu Wei-guo
Abstract: With the improving of technology advancement and enterprise management level, The enterprise need pressure vessel non-shutdown on-stream inspection technology urgently. This article analysis the research and the application of On-stream inspection engineering, and the request of inspection standard to pressure vessel On-stream inspection in domestic and abroad, Introduced pressure vessel On-stream inspection technology research and feasibility test research results, Pointed out that uses the emerging inspection technology (AE, TOFD etc.) and the traditional inspection method to inspect pressure vessel On-stream can evaluate pressure vessel security, and Safeguard pressure vessel safety.
Keywords: pressure vessel, On-stream inspection, AE, TOFD
【WZ006】 ECT Technology Applied to Large-scale Shaft Forgings of Testing
Chen Jingui
(Xiamen IDEA Electronic Technology Co.,LTD 361008 )
Abstract: A method of non-destructive testing - Eddy current testing technology, it is a better method to solve large-scale surface defects shaft forgings rapid production testing, in-service inspection, beyond magnetic particle testing and penetrant testing methods. The ECT principle of detection, program implementation, and evaluation on flaw judge, such as defects in detail.
Keywords: Non-destructive Testing, Shaft Forgings, Eddy Current Testing, Magnetic Particle Testing, Penetrant Testing
【WZ007】Electromagnetic detection of high-speed railway in China
DING Song1, WANG Ping1, TIAN Gui-yun1, 2 , WANG Hai-tao1
(1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016;2. School of Electrical, Electronic and Computer Engineering, Merz Court, University of Newcastle upon Tyne, Newcastle, NE1 7RU, UK)
Abstract: high-speed railway electromagnetic detection defect stress
Abstract: The oblique cracks are most dangerous in high speed railway, and most difficult to be detected. In this paper electromagnetic techniques are used to solve this problem. By means of simulation and experimentation of rail sample, the relationship between the electromagnetic response of rail head material under excitation and the situation of defects and stress in the surface and subsurface is researched. The model also contains the variables of different feature of defects in the material and stress of the material. Based on the results of simulation, a Yoke and 3D magnetic sensor array is formed and PMFL,PEC effects are measured to get the feature of defects while the magnetic memory effect and Barkhausen noise are measured to get the information of stress formulation in a non-contact way.
【WZ008】Edge detect method on cylindrical shells
HU Mei-e, WU Jian-hua
(Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China)
Abstract: An image processing method has been established in this study, which can be used to automatically process the photographic image of the inner surface and obtain the characteristic parameters, in the detonation experiments of metal cylindrical shells. The M-H operator is employed for the edge detection on the image. A double line edge output method is proposed to avoid the edge cross connection problem. The continuous close edge, which can describe the contour curve of inner surface, is obtained. The automatic extraction method and equivalent radius measure method on the contour curve of inner surface are studied. The application results show that the method can fast obtain the quantitative physical parameters, such as the equivalent radius of inner surface.
Keywords: image process, edge detect, metal cylindrical shell, high speed photography
【WZ009】Analysis of NDT Quality Control In Lifting Machinery Manufacturing
Ji Liming
Wuxi Branch,Jiangsu Province Special Equipment Safety Supervision Inspection Institute
Abstract: Due to working environments and undergoing various type of repeated loading, the weld quality of the main loaded structural components of the lifting machinery may affect directly the safety of their operation. The application of the NDT may fairly guarantee the weld quality, so it is of great importance to strengthen the NDT quality control in lifting machinery manufacturing.
Keywords: lifting manufacture NDT quality control
【WZ010】The Simulation of Using Phase Array Technology to Inspect Complex Structure Weld
Jiang Yunxi,Shan Lianqi
Matrix U/E Technology Inc.
Abstract: Thanks to the advanced technology and imaging function, phase array UT technology has widely used for inspecting complex structure weld. But phase array technology can't estimate the origin of the signal and the position, so CIVA simulation tools can be used to analyze the result from phase array UT inspection, and this module can be used to prove the inspection procedure and defect analyses.
Keywords: Complex Structure Weld, Ultrasound phase array, Simulation
【WZ011】Ultrasonic Characteristics of ductile iron
Jin Cui-e, Lu Chao, Chen Mou-chai, Lu Min-hui
(Key Laboratory of Nondestructive testing, Ministry of Education, Nanchang Hangkong University, 330063, Jiangxi Nanchang, China P.R.,330063)
Abstract: Focuses on the sound propagation characteristics of ductile iron and ultrasound features of ductile iron deficiencies. First with the general testing method for testing the selected parts to see whether there is defect feature to follow, then use the scanning system of Feature-Scan [1] to scanning the work-piece, to see whether its characteristics is the same as previous features or not. Using the ultrasound F -scanning detection system to achieve the two-dimensional ultrasound amplitude attenuation of measured specimen, and the imaging of velocity of the F-scan, we can indirectly measure and evaluate the elastic modulus of the materials increase by ultrasound attenuation and the plan of velocity distribution ,then evaluate the mechanical properties and defect characteristics [2] of ductile iron.
Keywords: ductile iron; ultrasound; characteristics; experiment
【WZ012】Emergency Rescue Decision Assistant System Based on GIS for Natural Gas Pipeline
DING Shou-Bao1, LIU Fu-Jun1,*, KONG Shuai1, LING Zhang-Wei1, Hu Dong-Ming1, Qian Ji-Ren2, LI Zi-Li3
(1. Zhejiang Province Special Equipment Inspection and Research Institute, Hangzhou, 310020, China)
(2. Zhejiang Natural Gas Development Co., Ltd, Hangzhou 310006, China)
(3. College of Transport & Storage and Civil Engineering, China University of Petroleum, Dongying, 257061, China)
Abstract: As one vital lifeline project, the natural gas pipeline is attached much importance. For the key technical problems which threat the safety of the natural gas pipeline, the corresponding research work including the offset mechanism and safety evaluation, the optical fiber warning system and leakage inspecting box, and the diffusion forecasting technology, was carried out. Based on GIS platform, all above research results as well as the SCADA monitoring system, the maintenance vehicles location by GPS, the IP telephone and vedio, the regional broadcasting, and the SMS, were integrated. At last, the emergency rescue decision assistant system based on GIS for natural gas pipeline was established. This system has a good ability of emergency response, command and control, it provides a useful tool to assurance the operate safety of the natural gas pipeline.
Keywords: Long distance pipeline; Emergency rescue; Optical fiber warning; Leakage inspecting box; GIS
【WZ013】Research on the Real-time Calculation of Gas Leakage and Diffusion and Hazards Prediction of Fire and Explosion for Nature Gas Pipeline
LIU Fu-Jun1,*, LING Zhang-Wei1, KONG Shuai1, Hu Dong-Ming1, Qian Ji-Ren2, LI Zi-Li3
(1. Zhejiang Province Special Equipment Inspection and Research Institute, Hangzhou 310020, China)
(2. Zhejiang Natural Gas Development Co., Ltd, Hangzhou 310006, China)
(3. College of Transport & Storage and Civil Engineering, China University of Petroleum, Dongying 257061, China)
Abstract: The leakage and diffusion of nature gas could lead to fire and explosion. It is meaningful to research the methods for real-time gas diffusion calculation and hazardous areas predication. Considering the effect of wind, using the revised Gaussian plume model, diffusion concentration distribution of gas was calculated fast and the comparison result showed that the accuracy of the revised Gaussian plume model was significantly better than that of the Gaussian model. Moreover, the hazardous effect of fire and explosion was analyzed. A fire and explosion hazards analysis system was developed. Using this system, the hazardous areas could be predicted, safe guarantee for rescue could be achieved and the hazards of fire and explosion could be reduced. At last, using an explosion case, the effectiveness of the evaluation models was checked in the aspect of the hazard of shock wave of explosion and the hazard of thermal radiation. The checking result showed that evaluation models for diffusion calculation and hazards predication were effective.
Keywords: Nature gas pipeline; Leakage; Diffusion; Fire; Explosion; Hazards prediction
【WZ014】Development of a GPRS-based Leak Detection Device for Pipe Pushing
Crossing Part of Nature Gas Pipeline
LIU Fu-Jun1,*, KONG Shuai1, LING Zhang-Wei1, HU Dong-Ming1, QIAN Ji-Ren2, LI Zi-Li3
(1. Zhejiang Province Special Equipment Inspection and Research Institute, Hangzhou 310020, China)
(2. Zhejiang Natural Gas Development Co., Ltd, Hangzhou 310006, China)
(3. College of Transport & Storage and Civil Engineering, China University of Petroleum, Dongying 257061, China)
Abstract: There would be a sealed space, called culvert box, between the nature gas pipeline and the culvert pipe when the nature gas pipeline crossing highways, railways and rivers using the pipe pushing crossing construction technology. In order to deal with the problem of leak detection and monitoring for these culvert boxes, which were located in the filed and scattered, a GPRS-based leak detection device was developed with the characteristics of low power, long life and high sensitivity. The device was powered by batteries, using DSP as the main controller, using methane sensors to detect nature gas leakage, transferring data through GPRS. The device was applied in the Hangzhou-Ningbo pipeline of Zhejiang nature gas pipeline. The results of the application show that the GPRS-based leak detection device can fulfill the function of online-monitoring and warning for the culvert boxes of the natural gas pipeline.
Keywords: Nature gas pipeline; Pipe pushing crossing; Leak detection; GPRS
【WZ015】The simulation video of ultrasonic inspection of reactor pressure vessel
Lv Tianming1, Lee Ming1, Chen Huaidong1, Wang Yanchen2, Xu Weike1
(1 CGNPC inspection technology limited company, Suzhou, 215004
2 Chong Qing You Dian University, Chong Qing, 400065)
Abstract: As the important equipment of guaranteeing the cooling of fuel element and the second barrier of preventing the diffusing of radioactivity, reactor pressure vessel plays a very important role in the nuclear security aspect. This paper describes the detailed execution process of simulation video of ultrasonic inspection of reactor pressure vessel. The simulation video can enhance the training effect of ultrasonic inspection of reactor pressure vessel; improve the reliability of ultrasonic inspection of reactor pressure vessel, accordingly improve the level of security function of nuclear power plant.
Keywords: nuclear power plant, reactor pressure vessel, ultrasonic inspection, simulation video
【WZ016】The ultrasonic testing of reactor pressure vessel closure stud
Ma Guanbing, Xiao Xuezhu, Shan Hongbing, Yuan Shuxian, Ye xin
CGNPC inspection technology limited company, Suzhou, 215004
Abstract: As an important component of nuclear devices, reactor pressure vessel closure studs need to be examined during pre-and in-service inspection according to RSEM. The inspection equipment is a complicated system including mechanical devices, controlling devices and UT inspection devices. This paper focuses on introducing the scope of the reactor pressure vessel closure studs by UT, selected probes, scanning pattern, and the calibration & verification, used equipments, acquisition and analysis system.
Keywords: reactor pressure vessel closure stud, ultrasonic test, probe, acquisition and analysis
【WZ019】Using Low Frequency Surface Wave for Rail Surface Inclined Crack Detection Method Research
MEN Ping1, 2 LU Chao1 ZHANG Zai-dong1 ZHAO Jun-yan2
(1.Key Lab of Nondestructive Testing (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China;
2. 92601 Troops of People's Liberation Army Navy, Zhanjiang 524009, China)
Abstract: Using the finite element numerical simulation method, simulate rail surface crack and the surface wave scatter in the crack and wave conversion, using the surface wave spectrum method for quantitative analysis of crack. Machining crack on the test block and 60Kg/m of rail respectively to verify the simulation results. Surface breaking cracks has a low-pass effect for the surface wave; high frequency surface wave cutoff frequency is inverse proportional to the depth of the crack.
Keywords: numerical simulation, surface breaking crack, low-pass effect, cut-off frequency
【WZ020】Quantitative NDT of Cracking for Hydro-Reactor Flange Sealed Groove
QiangTianPeng1, ChenYongQiang2, XiaoXiong3, WangYuLin2, ZhuYong2, Yi ChenLi2
Pressure Vessel Inspection Center of Jinlin Petro-chemical Corporation, Nanjing, 210033
JangSu Province Special Equipment Safety Supervision Inspection Institute, Nanjing, 210003
Jiangsu Zhongte Chuangye Inspection Co., Ltd,, Nanjing, 210014
Abstract: The quantitative NDT of flange sealed groove cracking is researched through the TOFD ultrasonic testing technique.
The Sensitivity reached 5×1mm (length multiplied by height),The measurement error of cracking height less than 0.5mm. The technology can be used to inspect flange sealed grooves in most dimensions and materials.
Keywords: Flange sealed groove, TOFD ultrasonic testing, quantitative NDT of Cracking
【WZ021】Investigation on Location Quantification of Defects inside Butt Welds in Small Diameter Tubes Based on Parallax
Sun Chao-ming, Tang Guang-ping, Wang Zeng-yong
(Institute of Machinery Manufacturing Technology, CAEP, Mianyang, 621900, China)
Abstract: To quantify the defects’ location inside butt welds in small diameter (Φ8mm) tubes, parallax method was investigated. The quantification method was found after image analysis on the testing results, and the factors correlated with measurement precision of defects’ location were analyzed. The results showed that the defects’ location could be calculated with enough precision to meet the requirement after taking certain techniques, which include setting properly marks on the tubes, adopting projective magnification techniques.
Keywords: Butt Welds,Parallax,Defects’ location,Quantification
【WZ022】Denoising by ICA in pulsed magnetic flux leakage signals
Cui Lidong1, Wang Haitao1, Sun Hailong1, Zhang Ying1, Tian Guiyun1.2
1 College of Automation Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing , 210016, China
2 Newcastle University Upon Tyne, UK
Abstract: As a combination of magnetic flux leakage method and pulsed eddy current method, pulsed magnetic flux leakage test (PMFL) has shown its potential advantages, which distinguished itself from other traditional NDT methods. However, the signal detected by PMFL measurement is so weak that the leakage magnetic field could be easily interfered by external noise from background. In this paper, we will shed light on the so called independent component analysis (ICA)and introduce its effectiveness on de-noising procedure. Related experimental results will be discussed afterwards.
Keywords: PMFL; ICA; noise elimination; FastICA
【WZ023】The Research on Phased Array Ultrasonic Testing System Technology Based on Signal-channel Simulation
Zhen SHI1, Haitao WANG1, Jilong CHENG1, Guiyun Tian1, 2
(1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, China 2. School of Electrical, Electronic and Computer Engineering, Newcastle University, UK)
Abstract: Ultrasonic phased array testing technology is an advanced ultrasonic non-destructive testing technology. Ultrasonic phased array technology can achieve flexible, controllable synthesized ultrasound beam and freely control the focus point position by exciting each element of ultrasonic array transducer with independent phase delay. Based on the synthesis of phased array focusing approach using signal-channel simulation experiment, a 16-element array, single-channel ultrasonic signal acquisition and processing of experiment system is designed. Test experiments are carried out with this system and defect block. The result of experiment is fitting the actual defects. Results show: this method can achieve the effect of phased array focusing, which greatly improved the detection signal noise ratio and sensitivity, also verify the ultrasonic phased array testing method is feasible. Through the experimental test defect detection, contrast focusing and non-focusing detection experiment results shows that phased array technology can improve the defect detection capability.
Keywords: ultrasonic phased array, phased array focusing, echo signal, signal synthesis
【WZ024】The Research of Ultrasonic Nondestructive Testing Based on Synthetic Aperture
Zhen SHI1, Haitao WANG1, Li ZHEN1, Xiaoyuan JIA1, Shaohua YIN1, Guiyun TIAN1, 2
(1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, China 2. School of Electrical, Electronic and Computer Engineering, Newcastle University, UK)
Abstract: Ultrasonic imaging detecting technique plays a very important role in the field of nondestructive testing in modern industry and it has become an important method for quantitative detecting. Nowadays ultrasound imaging technique is developed to enhance resolution power. The resolution power in sound and image has become one of the important performance indexes in evaluating ultrasound imaging system. But it is contradictive between the detective depth and high resolution when we take use of ultrasonic to detective object. In other words, it will get lower detective depth with high frequency ultrasonic system and it also will get lower resolution with low frequency ultrasonic system. Through the discussion in SAR imaging principle, imaging algorithm and orientation distinguish etc., we get a theoretic result that imaging resolution is just related with aperture and no related with Pulse frequency. It is also tell us the feasible of applying the SAR theory in NDT system. Emission signal, LFM signal and chirp signal directional was simulated throng MATLAB. The simulations concerned are also presented.
Keywords: Nondestructive Testing (NDT), Synthetic Aperture, Matlab, Signal Simulation
【WZ025】Research on accumulation mechanism of Metal Magnetic Memory
Liu Ping1, Wang Haitao1, Tian Guiyun1,2 Wang Ping1, Yao Entao1, Yang Yarong1
1 School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016
2 Newcastle University Upon Tyne, UK
Abstract: The advantage of Metal Magnetic Memory can achieve early detection and assessment of ferromagnetic materials. However, its lack of a unified theory and lack of the quantitative methods, so this technology has not been recognized. In order to further understand the generation and accumulation mechanism, the ferromagnetic specimen(Q235) under cyclic loading is undertaken. This paper discusses the technology of metal magnetic memory combined with the Magnetic Barkhausen noise. The result show that the side of metal magnetic memory signal waveform is asymmetry and the peak is larger, often has an Uneven distribution of the organizational structure, the peak and the stress will obviously changed after cyclic loading. According to the change of distribution of the magnetic field under cyclic loading, it offers a foundation for studying the relation between the signal of metal magnetic memory and stress concentration.
Keywords: Metal Magnetic Memory; Cyclic Loading; Magnetic Barkhausen Noise
【WZ026】Application of Barkhausen Noise to Measure the Stress of Ferromagnetic Materials
Yarong Yang1, Ping Wang1, Guiyun Tian1,2, Entao Yao1, Haitao Wang1, Deqiang Zhou1
(1College of Automation Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016,China
2 College of Electrical, Electronic and Computer Engineering, Merz Court, University of Newcastle Upon Tyne, UK)
Abstract: The surface stress of A3 steel with different thickness was measured through four points bending, and the correlation of the surface stress with Barkhausen noise and the different features (RMS, peak voltage, counts, envelope) of Barkhausen signal was researched. In the range of elastic limit, the feature of Barkhausen signal increases with the increase of tensile stress, and decreases with the increase of compressive stress. The different thickness of specimen has an impact on BN signal- The results show an overall upward trend with the thickness.
Keywords: Barkhausen, stress, four points bending
【WZ027】A Method for Quantitatively Evaluating Thickness of Elastic Plates Using High-overtone Bulk Acoustic Resonance
WANG Yu-ran, ZHANG Hui, ZHANG Shu-yi
Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China
Abstract: For the structures composed of elastic plates and the piezoelectric patches, based on the relations between the resonant frequency of the structure with high-overtone bulk acoustic resonance and the thickness of elastic plate, a quantitative method to measure the thickness of elastic plates is presented. In the structure, the resonant mode with the maximum effective electromechanical coupling factor k2 eff(max) has a high efficiency in exciting ultrasonic wave. Therefore, the ultrasonic wave of the unique mode can be used as detection signals to improve the signal-noise ratio. However, the distribution of the mode in the resonant spectrum changes with the acoustic impedance ratio between the elastic plate and the piezoelectric patch. According to Mason transmission line model, the corresponding calculated results show that, when the acoustic impedance ratio is less than 0.6, the order number of the mode with k2 eff(max) is equal to the order number of the first normal region in the spacing of parallel resonance frequency (SPRF); but when the acoustic impedance ratio is larger than 1.5, the order number of the mode with k2 eff(max) is equal to the order number of the first transition region in SPRF. The ultrasonic waves at both regions can be used as the detection signals to measure the elastic plate thickness variations. The method has a high sensitivity of 500Hz/1μm, so it can be used in nondestructive evaluations for thickness, thickness variations and the surface conditions of the elastic plates.
Keywords: Elastic plate; Thickness testing; High-overtone bulk acoustic resonance; Effective electromechanical coupling factor
This work is supported by National Natural Science Foundation of China (No. 10774074) and Research Fund for the Doctoral Program of Higher Education of China (No. 20090091120048).
【WZ029】Numerical Simulation of Electromagnetic Acoustic Testing Signals with Consideration of Electromagneto-mechanical Coupling Effect
Wenjing Wu, Cuixiang Pei, Zhenmao Chen
MOE Key Laboratory for Strength and Vibration, Xian Jiaotong University,Xi’an, 710049 China
Abstract: To clarify the influence of the electromagneto-mechanical coupling effect due to the additional electric field induced by the velocity effect on the simulated EMAT signals, a numerical code with consideration of the coupling effect is developed in this paper by introducing the v×B term to the governing equation of eddy current problem. In practice, the reduced vector potential (Ar) method and a step by step time integration algorithm are adopted with the finite element method for the simulation. The feature of the simulated EMAT signals and the propagation pattern of the simulated ultrasonic wave demonstrate that the algorithm and the corresponding numerical code are efficient. To investigate the influence of the coupling effect, EMAT signals of different conditions are simulated by using both the codes with and without the coupling effect considered. By comparing the numerical results of amplitude, Lorentz force, etc., it is demonstrated that the coupling term does not give significant influence on the EMAT signals. In practical application, with the coupling term ignored is reasonable. As an example of application, the numerical simulation of EMAT for thermal barrier coatings (TBC) is conducted by using the developed numerical code.
Keywords: EMAT, Electromagneto-mechanical coupling, Numerical simulation, FEM
【WZ030】Analysis of Lamb Wave Propagation Modes In Adhesive Plates And Signal Processing
Xia mei-ling, Lu Chao, Che fei
(Key Lab of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China)
Abstract: In this paper, a finite element method was used to investigate the lamb wave propagation in aluminum adhesive joints. Using 2D-FFT to recognize the modes, the simulation results were compared with the theoretical results. The experiment results show that the simulation is accurate and effective. It is approved that the lamb wave propagation is multi-mode and dispersion .The method of 2D-FFT can effectively identify the Lamb wave modes, the test results agree well with the results of the finite element analysis
Keywords: lamb; finite element; two-dimension Fourier transform; experiment
【WZ031】The effective method for internal-calibration of Non-Destructive Test instruments
Xie Changhuan
Shenzhen Institute of Special Equipment Inspection and Test, GuangDong
Abstract: To ensure the accurate of Non-Destructive Testing data and assure the reliable of Non-Destructive testing results , to avoid the risk of Non-Destructive testing responsibility, need to assure the internal calibration effectually, to meet the traceability of Non-Destructive testing instruments.
Keywords: Non-Destructive test instruments traceability internal-calibration
【WZ032】Based on alternating signal uniform strong magnetic field value simulation
Xu Wenzhang1.2 Chen Min1
Key Laboratory of Nondestructive Testing (Ministry of Education), Nanchang Hangkong University,Nanchang, 330063, China
2. 82016 Troops of People's Liberation Army Navy, Guangzhou 510380, China)
Abstract: One finite element numerical simulation model is built basing on the single rectangular coil which carries alternating signal, after its electromagnetic field distribution is analyzed in detail, which has analyzed does not have the flaw in the steel plate surface and the interior in the situation. The steel plate surface and in superficial thin layer air magnetic field distributed situation are studied, the perfect induction field is studied, the preliminary determination result is whether accurate, then withdraws a series of data in the specific way, further confirms the result reliability and the accuracy. Finally will produce this topic the research conclusion as well as to the ACFM technology in the future forecast.
Keywords: Alternating current field measurement technique Finite element numerical simulation Single rectangular coil
【WZ033】Some Problems in Ultrasonic Testing
XU Yun-Lai
(Yuncheng Yunheng Measure & Control Electrical Equipment Co Ltd, Yuncheng 044000, China)
Abstract: Aiming at three problems we encountered in Ultrasonic Testing, These three problems are respectively random replacement of couplant, surface coating as well as ignoring of the calibration and rechecking. In order to the importance of ultrasonic testing personnel, avoid missed and false as well as the reliability of ultrasonic test results, according to JB/T4730.3-2005 and GB11345-1989, These three problems was introduced.
Keywords: Ultrasonic Testing;Calibration and Rechecking;reliability
【WZ034】Simulation and Experimentation Research on New Pulsed Eddy Current Sensor
BinFeng Yang, YuFeng Zhao, Weisi Zhang
(Institute of Telecommunication Engineering, Air Force Engineering University, Xi’an 710077)
Abstract: Due to the sensor structure of traditional pulsed eddy current (PEC), a reference signal must be subtracted from total transient response signal to get the flaw information, the process of difference may bring errors. A new PEC sensor is proposed, which do not need to difference processing by changing the distribution of exciting magnetic field. The principle of new sensor is analyzed firstly, then, the performance of the sensor is validated by simulation and experiment method, the agreement between theory and experiment shows that the present sensor is valid.
Keywords: Pulsed eddy current; Sensor; Crack defect; Quantification
【WZ035】NDT Used to Detect Cable Based on X-ray Digital Imaging System
CHEN Hui,YAO En-tao
(College of Automation Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing ,210016,china)
Abstract: The coating of the bridge cable is a bit thick. It’s difficult to overcome the shortcomings of low efficiency and lift-off effect applied the methods of ultrasound and magnetic flux leakage when we detect the corrosion and fracture on line. Aimed to overcome the limitation of the present technology, a detection method based on x-ray digital imaging technology is put forward in this paper. It made use of portable x-ray digital detector to acquire images along the cable. By programming with MATLAB software, the algorithms of x-ray image pre-processing were studied. It calculated the size and location of the defect by the methods of identification, extraction and area size of corrosion defect.
Keywords: x-ray; cable; image processing; defect detection
【WZ036】Exciting Source for Electromagnetic Acoustic Transducer Based on AD9851
Jin-Zhe, Yao En-tao, Sun Ri-ming, Wang-Ping
(College of Automation Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing ,210016,china)
Abstract: Considering the special requirements of high drive current and high frequency of the coils used for electromagnetic ultrasonic inspection system for rail stress, A DDS technology-based electrical power source for excitation of Electromagnetic Acoustic Transducers (EMAT) is presented. We designed a new type of digital power taking DDS chip AD9851 and Single Chip Microcomputer (SCM) AT89S52 as the signal generator, under the control of SCM, the pulse frequency, numbers of pulse can be adjusted, and the initial phase is stable; In order to solve the problem of short circuit, the control signal is isolated and amplified, using full-bridge inverter circuit, meeting the system design requirements.
Keywords: EMAT; DDS technology; Full-bridge inverter circuit; Power amplification
【WZ037】The Application of γ-ray techniques for pipe joint
Zhang Changzheng
Abstract: Omitted.
Keywords: γ-ray radiographic techniques exposure piping joint
【WZ038】A Multi-frequency Inversion Algorithm and Its Application to the Quantitative NDE of Cracks in Welding Zone of a Lattice Sandwich Metallic Plate
Dongli ZHANG, Zhenmao CHEN
(MOE Key Laboratory for Strength and Vibration, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract: Lattice sandwich metallic plate (LSMP) is a new type of multifunctional material, which is widely used in many industry areas for its good mechanical behaviors. The material usually consists of two surface plates and an inner truss layer bonded together with welding joints. Defects such as cracks in welding joints may cause degradation of material properties and seriously influence the safety of related structures. Until now, there is no satisfactory nondestructive evaluation (NDE) method yet for the crack inspection of LSMP. An inverse scheme for crack reconstruction based on multi-frequency Eddy Current Testing (ECT) signals is put forward in this paper for the quantitative NDE of the defects in welding zone. Both measured and simulated ECT signals of a plus-point probe are used to reconstruct the profile of cracks in the welding zone. Good consistency between the reconstructed and true crack profiles demonstrated the validity and the efficiency of the new scheme for quantitative NDE of the LSMP.
Keywords: Lattice Sandwich Metallic Plate; crack; ECT; Inverse Scheme; NDE
【WZ039】DCPD Experiment for Inspection of Defects in Metallic Foam
ZHANG Jing, XIE Shejuan, CHEN Zhenmao
(MOE Key Laboratory for Strength and Vibration, Xi'an Jiaotong University, Xi'an 710049,China)
Abstract: To detect the defect and its size of the metallic foam, the nondestructive testing (NDT) experiment, which was based on the method of direct current potential drop (DCPD), was conducted in this study. During the experiment, five specimens with defects of different sizes were fabricated. Direct current was loaded to the five specimens respectively and the potentials on the middle line of the top surface of the specimens were measured. By making difference and filtering operation, the S/N ratio of the measured signals was improved. In addition, a numerical model was built to simulate the DCPD signals by using an FEM numerical code. Based on the experimental and the numerical results, two primary conclusions are obtained. The fist one is that the defect in the actual metallic foam can be detected by using DCPD technique, and the other is that the size of the defects depends on the amplitude of the potential signal, which lay a foundation for the quantitative NDT of the metallic foam.
Keywords: Metallic foam; Nondestructive testing; DCPD experiment; Finite element method
【WZ040】Reliability of the Radiation Testing on the Dissimilar Metal Weld
Zhou Ta-yu, Nie Yong, Zuo Chang, Cai Jun
(China Nuclear Power Operation Technology Corporation LTD)
Abstract: Using different exposure methods, to examine the dissimilar metal weld testing samples with artificial defects (crack and the lack of fusion) by radiographic examination,and to get the examination results for the defects. Dissecting and measuring the defects sizing in testing samples, and to compare with examination results and measuring value. By using the analysis of detection/residual detection POD (a) & the signal response data POD(a), the reliability of the radiographic examination of dissimilar metal weld and the main influence factors of reliability of the radiographic examinations are evaluated. Finally, the detection probability and the detection probability curve are given.
Keywords: Radiographic Examination, Reliability, Defect Detection Probability, Probabilistic Curve
【WZ041】Reconstruction of Crack Profile Based on a Fine Numerical Model of Stress Corrosion Crack
Li Wang1, 2, Zhenmao Chen1
(1. MOE Key Laboratory for Strength and Vibration, Xi'an Jiaotong University, 28 West Xianning Road, Xi'an, 710049, China; 2.College of Science, Xi’an Posts and Telecommunications Institute, Xi’an 710121, China)
Abstract: Sizing of cracks is one of the difficult points of the quantitative nondestructive testing. For a Stress Corrosion Crack (SCC), the reconstructed crack profile is often under prediction especially for the parameter of crack depth because of the ill-posedness of the corresponding inverse problem. In this paper, a fine crack model, which consists of a group of crack zones of different conductivity value, is proposed for the numerical simulation of SCC signals based on the measured conductivity distribution of a SCC. The reconstruction precision can be effectively improved by utilizing the new crack model and a hybrid inversion scheme of the Particle Swarm Optimization (PSO) algorithm and the Conjugate Gradient (CG) method. Reconstruction results from simulated and the measured eddy current signals of an artificial SCC demonstrate that the proposed numerical model and the inverse analysis scheme are effective for the sizing of SCC.
Keywords: Stress corrosion cracks; Reconstruction; Fine numerical model; Eddy current testing
【WZ043】identification of the anamorphic wave for welding ultrasonic inspection under the nuclear pressure vessel cladding
Yu Zhe, Liu Yang
(Cgnpc Inspection Technology Corporation, Suzhou 215004, china)
Abstract: This article introduces the anamorphic wave reflection example because of the effect of cladding when using welding ultrasonic inspection under the nuclear pressure vessel cladding, and it also analysis the basic principles and characteristics of anamorphic wave under the cladding.
【WZ044】Non-Destructive Measurement of Residual Stress by Neutron Diffraction and Diffractometer´s R&D
Junhong Li, Jianbo Gao, Jizhou Li, Yuntao Liu, Dongfeng Chen
(China Institute of Atomic Energy, P. O. Box 275-30, Beijing, 102413)
Abstract: This paper briefly describes the non-destructive measurement of residual stress by neutron diffraction methods. The first neutron diffractometer dedicated to three dimensional non-destructive relatively deep residual stress measurement and analysis at CARR in China has been Researched and developed. This will provide research and experiment platform for the domestic materials science and engineering customers.
Keywords: Neutron Diffraction, Residual Stress, China Advanced Research Reactor, Residual Stress Neutron Diffractometer
【WZ045】Method for Measuring the Density of Spherical Objects by High-energy Flash X-ray Radiography
XIAO Zhi-qiang GUAN Yong-hong 
(Institute of Fluid Physics,CAEP,P. O. Box 919-101,Mianyang of Sichuan Prov. 621900,China)
Abstract: A calibration method for measuring the density of spherical objects by high-energy flash X-ray Radiography has been presented. The principle and process is described. A series of measuring experiments demonstrated that the error of density measuring had been not greater than 10%.
Keywords: Flash X-ray radiography, Spherical Objects, Density Measuring, Calibration Method
【WZ046】Study of Guided Waves Excitation in Oil Storage Tank Edge-mounted Transducers
Wang -Weibin 12, Zhanjun Feng 1, YUAN Ke-yi2, HAN Zan-dong2 ,CHEN Yi-fang2,Wun wang1
1. Petro-china Pipeline R&D Center, Langfang, Hebei, 065000
2. Key Laboratory for Advanced Materials Processing Technology, Dept. of Mech. Engineering, Tsinghua University, Beijing 100084, China
Tel: +86-0316- 2170715
Abstract: In this paper, we present the behavior of ultrasonic wave propagating along plate structures using edge-mounted transducer by dynamic photoelastic method. The conversion conditions and reasons of series of longitudinal waves and the generation of Lamb wave are also presented. We also revealed the wave front energy attenuation and the energy transportation between each wave series when the waves propagate along the plate. Through photoelastic experiment and the comparison test, the employment of higher frequency (2MHz) longitudinal edge-mounted transducer is verified to be a viable option for large plate structure defect inspection.