| The tensile deformation behavior of copper, brass, nickel silver, phosphorous bronze and cold rolled steel sheets were studied. Based on true stress-true strain curves obtained by the uniaxial tension test at a constant cross-head speed, several constitutive equations were determined utilizing the regression analysis, and applicability of these equations to describe the stress-strain behavior of the non-ferrous alloys was investigated. In the present study, a Modified Voce equation, σ= B - (B - A) exp(-nε-C) is suggested, where a new term "C" has been incorporated into the exponential term of the Voce equation. The Modified Voce equation fits best with the experimental data of the nonferrous alloys and cold rolled steel sheets tested. From detail analysis of the exponential term, the value of "C/n" is found to be equal to the amonunt of pre-strain. |
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