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综合考虑应变、应变率和温度对绝热剪切的影响,通过理论推导建立了基于J-C本构方程的绝热剪切失稳判据。以45号钢、TC4钛合金和7050航空铝合金3种不同的金属晶格材料为例,计算得出了出现锯齿形切屑的临界切削速度,并以临界切削速度为参量,以敏感度作为衡量敏感性的统一标准,进行了本构参数对绝热剪切的敏感性分析,旨在说明J-C本构参数对绝热剪切的影响大小,为材料的本构研究和工程中绝热剪切的预测提供一定的理论参考。研究结果表明:3种材料中,TC4钛合金对绝热剪切的敏感性最大;J-C本构参数对锯齿形切屑的出现皆有影响,对绝热剪切的敏感性最大的是本构参数A,次大的是硬化系数n。
Considering the effects of strain, strain rate and temperature on adiabatic shear, the adiabatic shear instability criterion based on J-C constitutive equation was established by theoretical derivation. Take 45 steel, TC4 titanium alloy and 7050 aviation aluminum alloy as examples, the critical cutting speed of sawtooth-shaped chip is calculated, and the critical cutting speed is taken as the parameter and the sensitivity is taken as the measure Sensitivity analysis of constitutive parameters on adiabatic shear is carried out to show the effect of JC constitutive parameters on the adiabatic shear, which is provided for the constitutive study of materials and prediction of adiabatic shear in engineering Certain theoretical reference. The results show that the sensitivity of TC4 titanium alloy to adiabatic shearing is the highest among all the three materials. The JC constitutive parameters have the most influence on the occurrence of sawtooth chips, and the constitutive parameters A, The second is the hardening coefficient n.