含裂纹损伤钢构件力学参数的有限元模拟及灵敏度分析

Finite element simulation and sensitivity analysis of mechanical parameters of steel components with crack damage

以含裂纹损伤钢构件为研究对象开展拉伸试验,通过有限元分析研究了相对裂纹长度对含裂纹损伤钢构件的力学参数的影响,发现含裂纹损伤钢构件的剩余极限强度和屈服强度均随着相对裂纹长度的逐渐增加近似线性减小,断后伸长率随着相对裂纹长度的增加非线性减小。引入不同强度钢材的屈强比,提出不同强度含裂纹损伤钢构件相关力学参数的计算公式,将其计算值与试验值进行对比,两者结果基本贴合,验证了所提出公式的准确性与适用性;在此基础上,将相对裂纹长度变化对其相关力学参数的影响进行了灵敏度分析。

The tensile test was carried out on the steel component with crack damage which was taked as the research object,and the influence of the relative crack length on the mechanical parameters of the steel component with crack damage was aalyzed and studied by finite element analysis.It is found that the residual ultimate strength and yield strength of the steel component with crack damage decrease approximately linearly with the gradual increase of the relative crack length,and the elongation after fracture decreases nonlinearly with the increase of the relative crack length.The yield ratio of steel with different strengths was introduced,and the calculation formula of the relevant mechanical parameters of steel components with crack damage of different strengths was proposed.The calculated values were compared with the experimental values,and the results of them are basically consistent,which verifies the accuracy and applicability of the proposed formula.On this basis and the sensitivity analysis was conducted on the influence of relative crack length on its related mechanical parameters was analyzed.