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Investigation of thick sheet AHSS springback in combined bending under tension

机译:拉伸作用下厚板AHSS回弹研究

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摘要

In this paper, we investigate the springback behavior of several advanced high-strength sheet steels (TRIP, Dual-Phase, ferrite-bainite) with thicknesses up to 4 mm. Samples were tested by means of the bending-under-tension (BUT) test. The BUT has been extensively applied, in the literature, to relatively thin (1 mm and thinner) sheet metals for automotive applications; the applicability of several guidelines from the literature was investigated in this work in the context of thick advanced high strength steel (AHSS) sheets and using a sample width of 12 mm. The monotonic decrease of springback as back force increased was confirmed for this category of sheet steels, and a general trend for the non-linear influence of the tool radius was observed. With the selected sample width, the effect of the secondary curvature was negligible. Conclusions and simple guidelines are drawn from the analysis with industrial sheet forming applications in mind.
机译:在本文中,我们研究了几种厚度高达4 mm的高级高强度钢板(TRIP,双相,铁素体-贝氏体)的回弹行为。样品通过弯曲下弯曲(BUT)测试进行测试。在文献中,BUT已广泛应用于汽车应用中相对较薄(1毫米或更薄)的钣金。在这项工作中,在厚的高级高强度钢板(AHSS)的情况下,使用12 mm的样品宽度,研究了文献中的几项准则的适用性。对于这种类型的钢板,已经证实了随着反作用力的增加,回弹的单调减少,并且观察到了刀具半径的非线性影响的总体趋势。对于选定的样本宽度,二次曲率的影响可以忽略不计。从分析中得出结论和简单指南,并考虑到了工业板材成形的应用。

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