Investigation into wall wrinkling in deep drawing process of conical cups
Investigation into wall wrinkling in deep drawing process of conical cups
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DOI：
10.1016/j.jmatprotec.2011.05.026
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发表时间：
2011-11
影响因子：
6.3
通讯作者：
M. Shafaat;Mahmoud Abbasi;M. Ketabchi
中科院分区：
文献类型：
--
作者：
M. Shafaat;Mahmoud Abbasi;M. Ketabchi
起皱现象是板料成形过程中的主要极限失效形式之一。通过实验和数值模拟研究了圆锥杯试验中杯体侧壁区域的起皱现象。本文提出了一种新的挠度函数，并采用Hosford和Hill-1948屈服准则，研究了材料各向异性对各向同性、法向各向异性和平面各向异性条件下塑性变形的影响。据观察，霍斯福德屈服准则的应用导致更好地预测的蠕变开始。还发现，随着有效应力的增加，预测结果和实验数据之间的一致性在开始的蠕变改善。此外，实验数据与使用建议的偏转函数的预测之间也取得了良好的一致性。
Wrinkling phenomenon has been one of the major limiting failure modes in sheet metal forming processes. Wrinkling phenomenon in sidewall area of the cup formed in the conical cup test was considered both experimentally and numerically. A new deflection function is developed in this research and the effects of material anisotropy on the onset of wrinkling are studied using Hosford and Hill-1948 yield criteria under isotropy, normal anisotropy and planar anisotropy conditions. It was observed that application of Hosford yield criterion resulted in better prediction of wrinkling onset. It was also found that as the effective stress increases, consistency between predicted results and experimental data at the onset of wrinkling improves. Also, a good agreement between experimental data and predictions using proposed deflection function is obtained.