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In certain materials, the yield point appears clearly ; in other materials, it is indistinct. Using an intelligent universal test machine, the yield point is measurable even in materials with an indistinguishable yield point. The test machine used in this study can measure stress, strain and time simultaneously. Heretofore, the boundary of plasticity and elasticity has been denoted as the elasticity-plasticity transition point (E-P point σep) to distinguish it from the yield point. In this study, the behavior of the E-P point σep of an indistinguishable-yield-point material S45C material is analyzed on the basis of the change in of the elevated tensile speed V1 increase. Experimental results were analyzed on the basis of the relationship between stress and strain due to elastic recovery (reducibility strain), and between stress and stress due to elastic recovery (reducibility stress). In this paper, we explain that the E-P point σep of S45C material in accordance with tension is based on the elastic recovery of S45C material.

nihon kikai gakkai ronbunshū. a

Relationship between Elevated Tensile Speed V1 and Elasticity-Plasticity Transition Point .SIGMA.ep of Indistinguishable-Yield-Point S45C Material Using Intelligent Universal Test Machine