Fatigue Crack Growth, Coalescence Behavior and Its Simulation on Multi-Surface Cracks

복수 표면피로균열의 성장합체거동과 시뮬레이션에 관한 연구

In this paper, fatigue tests were carried out to study the behavior of growth and coalescence of multi-surface cracks which were initiated at the semi-circular surface notches, and a simulation program was developed to predict their growth and coalescence behavior. By comparing the experimental result with those of the simulation based on SPC(surface point connection), ASME and BSI(British Standards Institution) conditions, we tried to enhance the reliance and integrity of structures. This shows that the simulation result has utility for fatigue life prediction.