A study on the effect of stress concentration factor determined by 3D-ESPI system on the fatigue life

초록

Fatigue life estimated by the theoretical stress concentration factors are, in general, considerably different from test results. And in calculation stress concentration factor, it is very difficult to include actual geometry and material property which are the notch processing conditions, imperfections or defects of materials such as pososities, inclusions and casting defects, etc. Therefore, the paper deals with the experimental method to find out the more exact stress concentration factors by measuring the strain distributions on each specimen by 3D-ESPI system. Then the fatigue lives are cpmpared between theoretical calculations by 3D-ESPI system and test results.