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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Forming-limit strains of perforated steel sheets under biaxial stress state
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Forming-limit strains of perforated steel sheets under biaxial stress state

机译：双轴应力状态下带孔钢板的成形极限应变

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摘要

The forming-limit strains of cold-rolled steel sheets perforated with regularly arranged round-, square-, and cross-shaped holes were experimentally and theoretically estimated. Two types of hole arrangements, i.e. square and triangular patterns, were considered for each hole shape and the experimental forming-limit strains were determined using the hemispherical dome test (also known as Nakazima test). The theoretical forming-limit curves were computed using the finite element method with Hill's quadratic yield function and a plastic instability criterion determined from the external force power. By comparing the experimental results and theoretical calculations under proportional loading, the formability prediction performance of the theoretical approach was evaluated. It was found that although the approach is not applicable for the triangular array of cross-shaped holes, it can achieve partially acceptable prediction for the other cases.
机译：从实验和理论上估计了穿孔有规则排列的圆形，方形和十字形孔的冷轧钢板的成形极限应变。对于每种孔形状，考虑了两种类型的孔排列，即正方形和三角形图案，并使用半球形圆顶试验（也称为中岛试验）确定了实验成形极限应变。理论上的成形极限曲线是使用具有希尔二次屈服函数和根据外力确定的塑性不稳定性准则的有限元方法计算的。通过在比例载荷下比较实验结果和理论计算，评估了该理论方法的可成形性预测性能。已经发现，尽管该方法不适用于十字形孔的三角形阵列，但是对于其他情况，它可以实现部分可接受的预测。

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