摘要
实验测试了酸洗汽车结构钢QSt E系列热轧钢板不同方向(与轧向分别成0°、45°和90°)的单向拉伸力学性能,获得了其各向异性屈服行为。依据Hill48、Hill90和Barlat89各向异性屈服准则及其参数计算方法,分别建立了QSt E系列钢种的各向异性屈服模型,并将模型预测的不同方向屈服应力及r值与实验结果进行对比分析。结果表明,经优化后的参数求解方法可很好的同时预测单向屈服应力和r值。在r值的预测能力上,不论r值呈抛物线型变化还是单调递增变化,Hill48屈服准则均能很好的预测,Hill90屈服准则仅能很好的预测单调递增变化的情况,而Barlat89屈服准则对两种情况下的预测能力均较弱。
The uniaxial tensile mechanical properties of the QSt E series hot-rolled steel sheets( pickled automotive structural steel) in different directions( with rolling directions of 0°,45° and 90° respectively) were experimentally tested,and anisotropy yield behavior was gained. According to the anisotropic yield criteria of Hill48、Hill90 and Barlat89 and parameter calculation method,the anisotropic yield models of QSt E series steel were established respectively. Meanwhile,the experiment results were compared with the yield stress in different directions and r values predicted by the model. The results show that the optimized solving method of parameters can predict the yield stress and r values simultaneously very well. In the prediction capability of r values,Hill48 yield criterion can predict well regardless of the parabolic or monotonic incremental change of r value,and Hill90 yield criterion can only predict the monotonically increasing variation well,and Barlat89 yield criteria is weak in predicting the two cases.
引文
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