応力三軸度を考慮した破壊シミュレーションの鋳鉄材料の動的貫通試験への適用

抄録

The casing of a rotating machine is required to contain the fragments when the rotating body is broken. The purpose of this study is to clarify the material model for the fracture simulation, which can be applied to the evaluation of containment capability of casing made of cast iron with low ductility. The dynamic penetration test of the FCD 450 plate showed that the fracture mode changed, and the absorbed energy increased as the bullet velocity increased. As a result of the reproduction analysis using Modified Johnson-Cook law considering the stress triaxiality in the fracture strain, it was found that the dependence of the fracture mode and the absorbed energy on the bullet velocity could be explained and the absorbed energy could be reproduced within an accuracy of ± 20%.