SUS304製薄板試験片に生じる特異な変形挙動の三次元FE解析

抄録

In a tensile test of a thin sheet specimen made of SUS304 at low strain rate, anomalous deformation behaviour accompanied with generation and propagation of an X-shaped region with higher strain can be observed in a later stage of deformation after maximum force point. Some past studies have considered the anomalous deformation behaviour is caused by strengthening because of strain-induced martensitic transformation (SIMT), however, the mechanism of the generation and propagation is still unclear. Since SUS304 indicates complicated deformation behaviour due to SIMT, a numerical simulation is necessary to clarify the mechanism. In this study, a 3D finite element analysis with a consideration of initial imperfection on yield of austenite is performed for the tensile test at low strain rate using a sheet specimen made of SUS304 by including a modified damage model.