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Dr. Jeffrey T. Fong

 A New Approach to Real-Time-NDE-Based and Fatigue-Model-Assisted Maintenance Decision Making


Jeffrey T. Fong

Applied & Computational Mathematics Division

National Institute of Standards & Technology

Gaithersburg, MD 20899, U.S.A.


         Recent advances in structural health monitoring of critical equipment or system have given engineers a large amount of NDE data as a function of time.  For example, when a small crack is detected and the component or structure is still functioning without breaking, it is now possible to monitor the crack and measure its rate of growth in real time.  In this talk, we will present a new approach to estimating, with uncertainty, the remaining life of the cracking component or structure using the real-time NDE-based crack-growth-rate information.  Since the real-time crack-growth-rate information is obtained from an individual component or structure, similar to the health-monitoring-data of a human patient, the prediction of our fatigue life model, also with uncertainty, is necessarily component-specific.  This has the advantage that our approach is applicable to either a new or an aging component.  Significance and limitations of this new approach to engineer’s ability to monitor critical equipment or system and make maintenance decisions based on real-time NDE data are also presented.

Biographical Sketch of Speaker: 

   Dr. Jeffrey T. Fong has been Physicist and Project Manager at the Applied and Computational Mathematics Division, Information Technology Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD, since 1966.  He was educated at the University of Hong Kong (B.Sc., Engineering, first class honors, 1955), Columbia University (M.S., Engineering Mechanics, 1961), and Stanford (Ph.D., Applied Mechanics and Mathematics, 1966). 

    Prior to 1966, he worked as a design engineer (1955-63) on numerous power plants (hydro, fossil-fuel, nuclear) at Ebasco Services, Inc., in New York City, and a teaching & research assistant (1963-66) on engineering mechanics at Stanford University. 

During his 40+ years at NIST, he has conducted research, provided consulting services, and taught numerous short courses on mathematical and computational modeling with uncertainty estimation for fatigue, fracture, high-temperature creep, nondestructive evaluation, electromagnetic behavior, and failure analysis of a broad range of materials ranging from paper, ceramics, glass, to polymers, composites, metals, semiconductors, and biological tissues. 

    A licensed professional engineer (P.E.) in the State of New York since 1962 and a chartered civil engineer in the United Kingdom and British Commonwealth (A.M.I.C.E.) since 1968, he has authored or co-authored more than 100 technical papers, and edited or co-edited 17 national or international conference proceedings.  He was elected Fellow of ASTM in 1982 and Fellow of ASME in 1984.  In 1993, he was awarded the prestigious ASME Pressure Vessels and Piping Medal.   Most recently, he was honored at the 2014 International Conference on Computational & Experimental Engineering & Sciences (ICCES) with the Lifetime Achievement Award.