Expert Details

Expert in Mechanical and Electrical Design and Failure Analysis

Expert ID: 722077 California, USA

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Expert has used applied mechanics in a wide variety of design and failure analysis cases. In some cases, analysis requires a heat transfer and energy balance to determine the applied damping as well as an assessment of structural integrity of all components.

He has performed dynamic analyses on many devices and structures. For example, he designed dampers for the Golden Gate Bridge. Further examples include luggage carts on trains for the cart manufacturer, rolling of cars, trucks and wheelchairs in accidents, the lifting and setting of twelve 10-inch diameter pipes at once using a hooking crane, analysis of medical implants, and assessment of the Golden Gate Bridge movement in an earthquake. Our most advanced dynamic analysis software will create a video of the resulting dynamics for observation as well as output the resulting loads, stresses, and strains.

He has performed fracture assessments on pipes (including the Alaska pipeline), vessels, columns, airplane and helicopter engine parts as well as many other components. His company has the capability to develop simple models for use by their customers to perform sophisticated elastic plastic finite element assessments including mechanical, thermal, and residual stress loads. He is an expert in API 579, Fitness-For-Service evaluations.

Expert has experience assisting in the design of a wide variety of machinery and equipment. Examples include: machines for making cans and filling bottles; damping devices for shaker tables, bridges, towers, and computer-making machines; aircraft engine components, and testing equipment for medical devices, refinery equipment, and material evaluation.

Mechanical joining can be accomplished in a wide variety of ways: bolts and screws, welding, brazing and soldering, and a wide variety of glues and adhesives. He has a great deal of experience designing connections, evaluating connection failures and testing joints in his laboratory.

Stress and strain analysis for unusual situations is a specialty. He has assisted Lawrence Livermore Laboratory in assessing the stresses and strains in explosion containment vessels (he assembled and installed the high-speed strain data acquisition system) and determined the residual stresses in nuclear waste containers. He has assisted the U.S. Navy in evaluating the stresses, strains, and temperatures in submarine components and assisted virtually all the oil companies in evaluating the stresses, strains, and temperatures in pipes (high temperature, gauged, vibrating, etc.), vessels, pumps, turbines, and other operating equipment.

Statics is usually the first assessment method applied to a mechanical or structural device that has failed, tipped over, or been involved in a collision or impact. A "free-body-diagram" is developed to balance and determine loads and moments. In a dynamic analysis, the acceleration/deceleration forces of the various masses involved are added to the same equations. Expert has worked on several cases involving the tip-over of cranes, wheelchairs, forklifts, and scaffolding.


Expert conducted an investigation and determination of a refinery explosion. He assemble a 2-D time line of possible scenarios. He analyzed process equipment remains, and determined that a compressor house explosion buckled an erroded pipe causing it to rupture and released a flammable hydrocarbon at high temperature and pressure.Static and dynamic computer model of an aircraft engine connecting rod showed preload torque was inadequate, allowing the bolted connection to flex and resulting in a fatigue failure.Tests of wall heaters for a California utility revealed why the heat exchangers were cracking and exposing tenants to carbon monoxide.Assessment of automobile roof crush tests showed why the windshield must remain attached to prevent roof structural collapse.

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 - Hayward, California

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Year Degree Subject Institution
Year: 1993 Degree: Ph.D. in Mechanical Engineering Subject: Mechanical/Electrical Design Institution: University of California at Berkeley
Year: 1981 Degree: M.S. in Mechanical Engineering Subject: Material Behavior Institution: University of California at Berkeley
Year: 1980 Degree: B.S. in Mechanical Engineering Subject: Material Behavior Institution: Michigan Technical University

Work History

Years Employer Title Department Responsibilities
Years: 1990 to Present Employer: Undisclosed Title: Principal Department: Responsibilities: Expert's responsibilities are mechanical and electric engineering consultation and company management.
Years: 1978 to 1989 Employer: Chevron corp Title: Engineer Department: Engineering Department Responsibilities: He performed design and analysis of process equipment.

Government Experience

Years Agency Role Description
Years: 2000 to Present Agency: Lawrence Livermore Labs Role: Measure strains during explosion Description: Expert sets up and measures 32 channels of strain gage data. Samples are gathered at 50,000 samples per second on all channels during explosion tests.
Years: 1999 to 1999 Agency: Lawrence Livermore Labs - Yucca Mountain Role: Measure residual stress in nuclear waste caskets Description: He determined residual stresses in prototype nuclear waste caskets.
Years: 1998 to 1998 Agency: U.S. Navy Role: Assess bearings on submarine Description: He assessed bearings on a submarine drive system.

International Experience

Years Country / Region Summary
Years: 1989 to 1993 Country / Region: Canada Summary: He determined the cause of the SynCrude refinery fire.
Years: 1999 to 2000 Country / Region: Kuwait Summary: Assessment of Kuwait National Oil Company refinery coke drums.

Career Accomplishments

Associations / Societies
Expert is a member of ASME and the Vibration Institute
Licenses / Certifications
He is a licensed Professional Engineer in mechanical engineering.
Publications and Patents Summary
He is the authour of a patent and seven publications.

Fields of Expertise

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