IMPROVEMENT METHOD FOR FRETTING FATIGUE STRENGTH AND CRACK DETECTION METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To improve fretting fatigue strength by controlling a surface pressure itself as a cause of fretting. ;SOLUTION: In this improvement method, while detecting a surface pressure between members for generating fretting fatigue by a piezoelectric sensor 11, an output voltage is applied to a piezoelectric actuator 14 based on the detected value of the piezoelectric sensor and control is performed so as to add external pressure for minimizing surface pressure fluctuations as one of the causes of fretting fatigue. Thus, surface pressure fluctuations are minimized and fatigue strength is improved.;COPYRIGHT: (C)1999,JPO