アルミニウム鋳造合金の大規模疲労シミュレーション

抄録

We have addressed the mechanism of fatigue crack initiation in cast aluminum alloys. To numerically simulate the actual mechanical condition around the crack initiation site, the finite element model has to include a lot of inclusions along with micro and macro pores and material surface. We are trying to realize this kind of large-scale image-based finite element analysis by using the synchrotron CT and voxel finite element techniques. The finite element model of AC4CH-T6 cast aluminum alloy was constructed and its fatigue simulation of ten cycles loading was carried out. From the comparison of the experiment and the simulation, we found that the silicon particle in the crack initiation site underwent a high stress concentration and a low geometrical constraint leading to a gradual increase in the stress.