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 Expert  108154

Expert in Fatigue and Experimental Mechanics

Available for your Consulting and Expert Witness Needs

California (CA)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise: Listed with other top experts in: 
Expert has spent the bulk of his career in developing improved methods for predicting the fatigue life of mechanical parts. He has helped dozens of companies in designing and evaluating products for adequate fatigue performance, covering the spectrum from construction equipment to medical devices. His experience in this area has been acknowledged by his selection to be co-editor of the widely used Fatigue Design Handbook of the Society of Automotive Engineers. Over the years, he has conducted numerous fatigue tests of materials, lab specimens, and actual components. His current research emphasizes effects on residual stresses on fatigue and multiaxial fatigue.



life-prediction methodology


mechanical fatigue


structural mechanics


structural-component life-prediction methodology


tensile strength


aerial lift

Expert has over two decades of experience in both analytical and experimental techniques for determining stresses and strains caused by loadings applied to components in service. He is very knowledgeable in methods of experimental stress analysis, ranging from strain gauges to holographic interferometry. He uses these methods on a daily basis in teaching, research, and consulting. He is also experienced in the calculation of stresses using theoretical solutions and utilizes finite element codes in his work.

experimental stress analysis


strain gage


stress analysis


stress corrosion cracking


stress cracking

Having knowledge of most of the methods of experimental stress analysis, Expert teaches a course on that topic. Much of his work, especially in recent years, has been devoted to developing new methods of experimental stress analysis, particularly those using optical methods such as holography and fiber optics. He keeps current in this area of knowledge through participation in the activities of the Society for Experimental Mechanics.

strain analysis


strain measurement

Expert has devoted a significant portion of his recent work to the development of a new method based on laser holography for the determination of residual stresses created in mechanical parts by manufacturing, fabrication, and assembly processes. He is also experienced in the use of conventional methods of residual stress measurement such as material removal, hole drilling, and X-ray diffraction. He has measured residual stresses in many different types of components, including carbon and graphite prosthetic heart valves, extruded aluminum precision mirror supports, and welded steel structures. One of Expert's specialties is determination of residual stresses by various experimental methods. Over the years, he has concentrated on the use of mechanical methods but is very familiar with other approaches such as X-ray and neutron diffraction. He is involved in a project to develop and implement a new approach for determining residual stresses using holographic interferometry. Over the years, he has gathered considerable information on the effects of residual stresses on fatigue performance.

residual stress measurement


stress measurement

Expert's PhD thesis utilized fracture mechanics to predict the remaining fatigue life of components in which cracks formed either by fatigue or were initially present as small manufacturing defects. He has continued to work actively in this area and has used fracture mechanics in applications ranging from the prediction of the static fatigue (stress corrosion cracking) life of optical fibers to prediction of the life of welded structures containing various types of weld defects. He is also experienced in performing fracture mechanics tests, including crack propagation tests.

fracture mechanics


fracture stress

For over 25 years, Expert has performed fatigue life evaluations for a wide variety of mechanical components, ranging from small parts in computer disk drives to welded structure in earthmoving equipment. These evaluations have included stress-based and strain-based approaches as well as the application of fracture mechanics to the prediction of fatigue crack growth. In addition to teaching a course on fatigue design and analysis, Expert is past co-editor of the SAE Fatigue Design Handbook and keeps abreast of the latest developments in this field. His current research interests concern effects of residual stresses on fatigue and development of improved life prediction methods to handle complex states of stress of the type often encountered in service.

fatigue crack growth


metal failure


metal fatigue

Although fatigue of materials causes the vast majority of mechanical failures, other failure modes such as stress corrosion cracking, creep, fracture from overloads, surface failures such as pitting and spalling can also be the culprit. Expert is knowledgeable about these and other failure mechanisms, teaching a course covering these topics. He has also conducted a number of investigations to determine the cause of failures in mechanical devices ranging from computer disk drives to theater seats.

materials failure analysis

Expert teaches courses that cover the commonly used mechanical properties such as tensile strength, impact strength, hardness, and ductility properties. The courses emphasize how these properties can be employed in the design and structural integrity evaluations of products. He has either conducted or supervised numerous tests to determine mechanical properties and serves on committees of the American Society for Testing and Materials responsible for formulating test standards for the determination of mechanical properties.

solid mechanical property


impact resistance

Expert is knowledgeable of the material properties usually of interest in the design of mechanical components, such as yield and ultimate strengths and modulus of elasticity. In the course of his teaching and doing research and working for industrial clients, he has used material properties on virtually a daily basis for nearly three decades. He is also well acquainted with the type of tests that are typically performed to generate such properties, both through personal experience as well as participation in the activities of the American Society for Testing and Materials.

material property

Expert is familiar with the stress analysis and long-term strength characteristics of optical fibers through work done cooperatively with a major manufacturer of fiber optic devices. He is involved in one research program to develop a new type of fiber optic strain sensor and another that is exploring the use of fiber optic sensors to monitor the development of residual stresses in a graphite-epoxy composite component.

optical fiber failure

Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: San Jose, California;  San Francisco, California;  Sacramento, California;  Oakland, California;  Stockton, California;  Fremont, California;  Modesto, California;  Salinas, California;  Santa Rosa, California;  and Hayward, California.

Often requested
with this expert:

Failure Analysis of Materials
Mechanical and Electrical Design and Failure Analysis
Mechanical Design - Kinematics
Patran, Apex, Finite Element Analysis, Nastran, Metal...

Year   Degree   Subject   Institution  
1978   PhD   Mechanical Engineering   (Undisclosed University)  
1970   MS   Mechanical Engineering   (Undisclosed University)  
1968   BS   Mechanical Engineering   (Undisclosed University)  

Work History:
Years   Employer   Department   Title   Responsibilities

1978 to


(Undisclosed University)


Mechanical Engineering




1968 to 1978





Full-time employment and consulting experience in a wide variety of industrial projects-specializing primarily in testing and analysis.

Career Accomplishments:

Expert is a member of two scientific honor societies.


Expert won the Spergel Memorial Award for best paper on fiber optics technology at the 32nd International Wire and Cable Symposium. In 1994, he received the Hetenyi Award from the Society for Experimental Mechanics for the best research paper published in the journal Experimental Mechanics.

Publications and Patents Summary

Expert is past co-editor of the SAE Fatigue Design Handbook.

Selected Publications and Publishers  
 - International Journal of Fatigue  
 - Experimental Mechanics  
 - SAE Transactions  
 - American Society of Testing and Materials Special Technical Publication  

Consulting Services:
Recent Client Requests:
  • Expert in Fiber optic failure mode.
  • Expert in mechanical stress testing for consulting on Failure analysis.
  • Biomechanical test expert for consulting on real world testing of lower limb prosthetics.
  • Expert in finite element analysis and design for consulting on stress in a welded assembly.
  • Expert for consulting on Composite Plastics Pipe Failure Mechanisms.
  • Expert for consulting on Mechanical Seal Failure Analysis
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Recent Litigation Client Requests:
  • Ski lift expert for consulting on ski lift failure.
  • Expert in iintota for consulting on needed for Strain gage.
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

Additional Skills and Services:
Supplier and Vendor Location and Selection

Expert has experience locating vendors of: mechanical and materials testing labs and services and mechanical testing equipment and accessories.

He has access to the following resources: personal contacts, assorted print materials, and engineering library.


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