摘要
利用Matlab的优化函数改进了表征应力应变法的优化条件,并优化了表征应力应变法的计算流程,同时利用改进的弹塑性方程对屈服强度σy、应变硬化指数n和弹性模量E三个参数同时进行优化,从而确定了材料的力学性能参数,之后采用球形压痕表征应力应变法对P91钢的力学性能进行测试,并与单轴拉伸试验结果进行对比。结果表明:与单轴拉伸的试验结果相比,采用球形压痕表征应力应变法测得P91钢力学性能的精度较高,最大偏差值为12.11%。
Matlab optimization function was used to improve optimization conditions of representative stress-stain method and optimize calculation flow of representative stress-true stain method, and yield strength ey, strain hardening exponent n and elastic modulus E three parameters were simultaneously optimized by using improved elastoplastic equation. Thus the mechanical property parameters were determined. Then the mechanical properties of P91 steel were tested by ball indentation representative stress-strain method and compared with uniaxial tensile tesl results. The results show that compared with uniaxial tensile test results, the mechanical properties of Pgl tested by ball indentation representative stress-stain method had high accuracy and the maximum deviation was 12.11%.
出处
《机械工程材料》
CSCD
北大核心
2017年第9期106-110,共5页
Materials For Mechanical Engineering
