Dr. Hayashi's title of Doctor of Engineering research is X-ray Study on Fatigue Fracture Behavior of Aluminium. In the research, effect of crystal orientation on fatigue crack initiation life, directionality of fatigue strength in cold-rolled aluminium, grain size dependence of fatigue strength and crack growth, effect of test temperature on fatigue strength, fatigue crack growth in cold-rolled and stretched aluminium, etc, were studied. When Dr. Hayashi was working at Mechanical Engineering Research Laboratory, Hitachi Ltd., he studied and developed fatigue crack initiation life prediction...