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An Investigation into the Influence of Interrupted Loading in Improving the Stretch-Flangeability of Dual Phase Steel

Defect and Diffusion Forum(2022)

Indian Institute of Technology Madras | National Institute of Standards and Technology (NIST)

Cited 5|Views6
Abstract
Materials resistance to edge failure during sheet metal flanging operations is known as stretch-flangeability. It is one of the important concerns in the current automotive sector. Stretch flangeability of sheet metal is estimated by hole expansion test and commonly it is represented by hole expansion ratio (HER). The objective of the present work is to comprehend the hole expansion deformation behavior of DP600 steel. Firstly, finite element analysis was performed to understand the stress state at the edge during the hole expansion test. Thereafter, the effect of stress relaxation was studied by conducting hole expansion tests (HET) in monotonic and interrupted mode. Considerable improvement in the HER was observed. The HER was found to increase with the pre-strain. The combined effect of friction and stress relaxation played a crucial role in delaying the edge failure, resulting in the enhanced HER.
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要点】:本文研究了中断加载对提高双相钢DP600在金属板材翻边操作中的抗边缘失效性能(即延展翻边性)的影响,发现中断加载显著提高了孔洞扩张比(HER),揭示了摩擦和应力松弛的复合作用对延缓边缘失效的重要性。

方法】:采用有限元分析研究了孔洞扩张测试中边缘的应力状态,并通过单调与中断模式下的孔洞扩张测试研究了应力松弛的效果。

实验】:通过孔洞扩张测试(HET)研究了DP600钢的孔洞扩张变形行为,在预应变作用下HER有所增加,实验结果表明摩擦和应力松弛的复合效应有助于提高HER。