A method for calculating damage evolution in adiabatic shear band of titanium alloy

来源期刊：中国有色金属学报(英文版)2009年第5期

论文作者：王学滨

文章页码：1280 - 1285

Key words：adiabatic shear band; damage variable; titanium alloy; nonlocal theory; JOHNSON-COOK model; strain-hardening; strain rate

Abstract: A method for calculating the evolution of the local damage variable at the adiabatic shear band (ASB) center was proposed. In the present method, the JOHNSON-COOK model and the nonlocal theory were adopted, and the damage variable formula applicable for the bilinear (linearly elastic and strain-softening) constitutive relation was further generalized to consider the plastic deformation occurring in the strain-hardening stage. Aiming at Ti-6Al-4V, the effect of strain rate on the evolution of the local damage variable at the ASB center was investigated. In addition, a parametric study was carried out, including the effects of strain-hardening exponent, strain rate sensitive coefficient, thermal-softening exponent, static shear strength, strain-hardening modulus, shear elastic modulus, work to heat conversion factor, melting temperature and initial temperature. The damage extent at the ASB center in the radial collapse experiment was assessed. It is found that at higher strain rates the damage in the ASB becomes more serious at the same average plastic shear strain of the ASB.

基金信息：the Doctor Startup Foundation of Liaoning Province, China