Applicability of Hardening Models for Automobile Steel Sheets
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摘要: 以DX56D+Z、HC220BD+Z、HC420LA、HC420/780DP汽车钢板为研究材料，分别使用Ludwik、Swift、Hockett-Sherby、Voce、Swift-Hockett-Sherby和Swift-Voce硬化模型对单向拉伸试验获取的流动应力和塑性应变进行拟合，对比分析了6种硬化模型的拟合精度；以HC420/780DP钢板为例，分析了6种硬化模型对大应变范围（颈缩点后）内流动应力的拟合效果。结果表明：在塑性变形阶段，Hockett-Sherby硬化模型所描述的流动应力增长方式与试验结果最为接近，拟合的流动应力与实测结果的重合度最高；采用6种硬化模型外推得到HC420/780DP钢在大应变范围内流动应力的差异较大，Swift-Hockett-Sherby和Swift-Voce混合模型拟合自由度更高，拟合效果更好。Abstract: With DX56D+Z, HC220BD+Z, HC420LA and HC420/780DP automobile steel sheets as research materials, flow stresses and plastic strains obtained by uniaxial tensile testing were fitted by Ludwik, Swift, Hockett-Sherby, Voce, Swift-Hockett-Sherby and Swift-Voce hardening models, and the fitting accuracy of the six hardening models was compared and analyzed. With HC420/780DP steel sheet as an example, the fitting effect of the six hardening models was analyzed for predicting flow stresses in a large strain range (after necking).The results show that in the plastic deformation stage, the growth mode of flow stresses described by Hockett-Sherby hardening model was the closest to the test results, and the fitted flow stresses coincided with the measured results at the highest degree. The difference of flow stresses in the large strain range of HC420/780DP steel obtained by extrapolation with the six hardening models was relatively large. Swift-Hockett-Sherby and Swift-Voce mixed model had higher degrees of freedom of fitting, and had more significant fitting effect.
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Keywords:
- automotive steel sheet /
- flow stress /
- hardening model /
- data fitting
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