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 strengthσy ,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 test results.The results show that compared with uniaxial tensile test results,the mechanical properties of P91 tested by ball indentation representative stress-stain method had high accuracy and the maximum deviation was 12.11％.
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