耐热不锈钢X8CrNi25-21介观尺度材料本构建模与仿真
发布时间：2019-05-21 13:14
【摘要】：针对耐热不锈钢X8CrNi25-21的材料特性,基于弹塑性力学理论和位错动力学对经典的Johnson-Cook(JC)本构模型进行修正,引入位错塞积理论,并在本构中考虑晶粒尺寸和晶体取向等微观参数,建立了基于尺度效应的耐热不锈钢X8CrNi25-21介观尺度材料响应行为本构模型.通过采用介观尺度非标准件,并利用热处理工艺改变材料的晶粒尺寸,开展准静态拉伸实验、动态霍普金森压杆实验进行介观尺度材料测试,建立了晶体尺寸与介观尺度材料塑性变形与断裂行为特征的变化规律,并最终确定了耐热不锈钢X8CrNi25-21介观尺度材料本构模型各参数值.
[Abstract]:According to the material properties of heat-resistant stainless steel X8CrNi25-21, the classical Johnson-Cook (JC) constitutive model is modified based on elastic-plastic mechanics theory and dislocation dynamics, and the dislocation plug product theory is introduced. Considering the microscopic parameters such as grain size and crystal orientation, the response behavior model of heat-resistant stainless steel X8CrNi25-21 mesoscopic material based on scale effect is established. By using mesoscopic non-standard parts and heat treatment process to change the grain size of the material, quasi-static tensile test and dynamic Hopkinson compression bar test were carried out to test the mesoscopic material. The variation of plastic deformation and fracture behavior of mesoscopic materials with crystal size and mesoscopic scale materials was established, and the parameters of the constitutive model of heat-resistant stainless steel X8CrNi25-21 mesoscopic materials were finally determined.
【作者单位】： 北京理工大学先进加工技术国防重点学科实验室;北京电力设备总厂有限公司;
【基金】：国家自然科学基金资助项目(51375050)
【分类号】：TG142.71
[Abstract]:According to the material properties of heat-resistant stainless steel X8CrNi25-21, the classical Johnson-Cook (JC) constitutive model is modified based on elastic-plastic mechanics theory and dislocation dynamics, and the dislocation plug product theory is introduced. Considering the microscopic parameters such as grain size and crystal orientation, the response behavior model of heat-resistant stainless steel X8CrNi25-21 mesoscopic material based on scale effect is established. By using mesoscopic non-standard parts and heat treatment process to change the grain size of the material, quasi-static tensile test and dynamic Hopkinson compression bar test were carried out to test the mesoscopic material. The variation of plastic deformation and fracture behavior of mesoscopic materials with crystal size and mesoscopic scale materials was established, and the parameters of the constitutive model of heat-resistant stainless steel X8CrNi25-21 mesoscopic materials were finally determined.
【作者单位】： 北京理工大学先进加工技术国防重点学科实验室;北京电力设备总厂有限公司;
【基金】：国家自然科学基金资助项目(51375050)
【分类号】：TG142.71
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