A Study on the Damage by Measuring Electrical Resistance in Tensile Tests

The stress-strain relation is typically used to obtain mechanical properties, such as tensile strength, yield stress, and elongation. The stress-strain relation is particularly important in the forming process design using engineering software such as finite element analysis. Recently, damage and material softening by damage has been frequently used in the analysis of plastic deformation. To consider the damage softening, the stress-strain relation of a pure material without damage should be used in the analysis. However, the mechanical properties obtained by the simple tensile test are not the pure properties of the material, but those that reveal internal defects, such as voids, inside the material. In this study, to obtain the stress-strain relation of a pure material without damage was obtained by correcting the measured stress-strain relation using the electric resistance change during the plastic deformation.