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Jwo Pan Named SAE Fellow
The Society of Automotive Engineers has named Professor Jwo Pan a fellow. Pan was one of 32 members who earned the designation in 2006. The membership grade of fellow honors those who have made a significant impact on society's mobility technology through research, innovation or creative leadership.
Pan was recognized for his fundamental contributions to fracture mechanics, fatigue and plasticity theories that are critical to the design and manufacturing of sheet stamping, durability prediction, crash simulation, and spot weld fatigue and separation for the automotive industry.
He has recently developed failure criteria for automotive crankshafts. For many years, the auto industry has been using deep fillet rolling to induce compressive residual stresses near stress concentration sites to increase crankshaft fatigue life. But too much rolling can lead to lower fatigue resistance. For at least the past 50 years, according to Pan, the industry has relied on technicians visually inspecting crankshaft fillets for the presence of bubbles, the tell-tale sign of fractures, during bending fatigue testing.
Pan and his students used finite element computations and experimental correlations to determine and validate the residual stresses near the fillets and final failure of crankshafts. Their results indicated that the widely accepted four-bubble failure criterion is too conservative, and they have proposed new failure criteria. Based on Pan’s theoretical framework, engineers at DaimlerChrysler have validated the new failure criteria experimentally and automated bending fatigue tests, saving significant labor costs and time.
In work supported by Ford Motor Company, Pan developed failure criteria for spot welds under combined loading conditions, which has been generalized for spot welds under dynamic complex, multi-axial loading conditions for implementation into commercial finite element codes for crash simulations. A typical passenger vehicle relies on between 3,000 and 5,000 spot welds to join sheet metal parts. Damage to the spot welds impacts driver perception of the vehicle’s ride and also impacts vehicle safety, particularly during a crash.
Ford will be incorporating the new criteria into product design in the near future, according to Pan. A German SAE spot weld committee is already using his analytical and computational solution to study spot weld fatigue. Currently Pan and his group are investigating the failure and fatigue mechanisms of friction spot welds in aluminum sheets based on different processing parameters for manufacturing processing for the auto industry.
Pan is a co-author of a book entitled Fatigue Testing and Analysis, published by Elsevier in 2005. He completed a second book entitled Mechanics Modeling Sheet Metal Forming, that will be published by SAE later this year.
He says he is honored by achieving the rank of SAE fellow. He is grateful to his industry co-investigators “for bringing me these difficult, unresolved engineering problems. I am happy that our rigorous approach to solving practical problems will have a long-term impact on engineering practices in the automotive industry.”