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원천(Cheon Won),김진우(Jin-woo Kim),이동우(Don-woo Lee),송정일(Jung-il Song) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
Residual stress and fatigue crack propagation behavior of the Grade A mild steel cut by plasma cutting technique for the ship structural material are evaluated by experiments and finite element analysis (FEA). After applied the loads of 0%, 50%, 80% yield strength on each plasma cutting specimen, residual stresses were gauged through the strain changes. Then, these experimental results are compared with the FEA results. Fatigue crack propagation behavior was estimated through the fatigue test performed under R=-1 and 5Hz sine wave repeated load. The constants of paris equation are found from crack growth ratio and changes of stress intensity factor.