抄録
This paper deals with the effect of reinforcement shape factor on the stress intensity factor (KI) at the tip of a nonpropagating crack at the toe by using a Boundary element method. As micro-cracks exist in the welded joint, the fatigue strength of welded joint is determined by the propagating condition of nonpropagating cracks.
The following conclusions were derived from the numerical results of KI and the investigation of the shape of reinforcement made by shielded metal arc welding and CO2 gas welding; (1) The micro-crack does not affect KI; (2) The toe radius considerably influences KI; (3) The reinforcement angle affects KI; (4) The height and width of reinforcement do not affect KI.
