双相钢在塑性变形中塑性功向热能的转变

研究了在较低应变速率(0.00067s~(-1))下,双相钢试样静态拉伸过程中塑性功向热能的转变规律。在对静态拉伸过程能量分布分析的基础上,建立了传热模型,对室温下拉伸过程试样标距内材料的温度进行了数值求解。利用红外测像仪测量了拉伸过程中试样表面的温度,通过比较模拟值与实测值求得了β值(塑性功向热能转变系数)。真应变大于0.02时,β值随应变增加而上升较小,β值可以取0.93。

Conversion of Plastic Work to Heat during Plastic Deformation of DP Steel

The process about mechanical energy of plastic deformation tranforms into heat has been investigated, as it is carried at low strain rate（0. 00067s^-1 ） when static stretching. Based on the analysis of energy distribution at static stretching, a heat transfer model is established and solved by using the explicit finite volume method. The β coefficient is obtained by comparing the temperature calculated and the temperature measured by Infra Red Thermometer during static stretching. The result shows that the β coefficient is considered to be 0.93, as it almost doesn＇t increase when the true strain is more than 0.02.