Effect of gauge length on uniaxial deformation-energy components of copper and brass sheets

摘要

Deformation-energy components of copper and brass sheets have been studied by the uniaxial tensile testing of different test pieces having various gauge lengths. The total energy required to tear the specimens was assumed to be composed of elastic, uniform plastic and tearing or post-uniform deformation regimes. The total and elastic energy values were obtained directly from the load-extension curves for each specimen. Tearing and uniform plastic energy values were calculated by plotting the total energy divided by the specimen cross-sectional area against the initial gauge length of the specimens. In this plot, a straight line is obtained the slope of which gives the summation of the elastic and plastic energy per unit volume and its intercept gives the value of tearing energy. The results indicate that while the elastic and plastic energy ratios increased with increasing gauge length the tearing energy ratios showed a decreasing trend. The experimental energy ratios have been compared with theoretical ones obtained from the basic equations of uniaxial deformation.