SHPB試験に基づいた鉄基形状記憶合金性管継手の軸方向強度評価

抄録

Fe-28Mn-6Si-5Cr alloy is a kind of shape memory alloys. Its shape memory effect is lower than that of Ni-Ti alloy. On the other hand, the alloy has superior machinability and weldability. In addition, the mechanical property is almost the same before and after the shape recovered. Therefore, it is considered that the alloy is applied to the structural elements such as a pipe joint. However, it is considered that the pipe joint is loaded at various deformation rates. In the past study, axial strength is estimated by the quasi-static test. However, it is difficult to find a research work which consider higher deformation rate. Thus, it is important to estimate the strength of pipe joint at high deformation rate. In this study, a push-out test is performed based on the SHPB method. In addition, the impact joint strength is defined by the strength when circumferential strain of the joint starts decreasing.