Abstract
In order to consider the fatigue crack propagation behavior at root area of one side fillet welding joints which were adopted to the construction machine such as the hydraulic shovel, fatigue tests and the numerical simulation was carried out. Fatigue tests were carried out with the force ratio of 0.05 and the frequency of 20 Hz using one side fillet welding joints. Numerical simulation was conducted using S-FEM program. Observation result of the fatigue crack propagation indicated the welding joints hardly had the fatigue crack initiation life. Therefore, it is thought the approach of the fracture mechanics is useful for the fatigue life evaluation of the one side fillet welding joints. When fatigue test results were compared with the simulation results, no accordance was recognize between them. It is thought that this disagreement is caused by the shape of the initial crack, multiple cracks, and the distance between each crack.
