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Springback After the Lateral Bending of T-Section Rails of Work-Hardening Materials

机译:工质材料T形钢轨横向弯曲后的回弹

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This paper studies the springback after the lateral bending of T-section rails, considering the work-hardening materials. A linear-hardening model and an elastic-plastic power-exponent hardening model of the material are adopted and compared with the real experimental stress-strain curve obtained from the uniaxial tension tests. The analytical formulas for the springback and residual curvatures are given. The numerical results indicate that the material hardening directly affects the accuracy of springback prediction compared with the experimental results. Besides, springback prediction is not sensitive to hardening parameters in the beginning of elastic-plastic bending deformation. Although there is an apparent yield stage in the true stress-strain curve, the adopted hardening models can achieve an allowable relative error, if hardening parameters are properly selected.
机译:本文考虑了工作硬化材料,研究了T形钢轨横向弯曲后的回弹。采用材料的线性硬化模型和弹塑性幂指数硬化模型,并将其与从单轴拉伸试验获得的实际实验应力-应变曲线进行比较。给出了回弹和残余曲率的解析公式。数值结果表明,与实验结果相比,材料硬化直接影响回弹预测的准确性。此外,回弹预测在弹塑性弯曲变形开始时对硬化参数不敏感。尽管在真实的应力-应变曲线中有一个明显的屈服阶段,但是,如果正确选择了硬化参数,则采用的硬化模型可以实现允许的相对误差。

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