Plastic bending of adhesive-bonded sheet metals
Plastic bending of adhesive-bonded sheet metals
复制标题
粘合金属板的塑性弯曲
DOI：
10.1016/s0924-0136(01)00637-9
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发表时间：
2001
影响因子：
6.3
通讯作者：
F. Yoshida
中科院分区：
文献类型：
--
作者：
M. Takiguchi;F. Yoshida
粘接正成为金属板工业中流行的连接技术之一，因为它具有优于诸如焊接和扩散连接的其他技术的一些优点，例如，任何不同的金属都很容易粘合在一起，并且存在于两个金属片之间的粘合剂层可以起到减振的作用。通常，压制成形的金属板元件在组装的最后阶段被接合在一起。然而，如果能够将粘合剂粘结的平板金属压制成形为最终产品，则从高生产率的观点来看，这将是一种极好的技术。本文通过V形弯曲实验研究了胶接金属板料的塑性弯曲。在V形弯曲中遇到的一个严重问题是弯曲引起的粘合剂层的大的横向剪切变形，这导致弯曲板的几何缺陷（所谓的“鸥翼”弯曲），并且在某些极端情况下，它导致板的分层。实验观察和弹塑性应力分析表明，大的剪切变形仅在V形弯曲的最后阶段才迅速发展。因此，建议对粘接金属板进行空气弯曲操作，以将粘接层的剪切变形抑制在可接受的限度内。
Adhesive bonding is becoming one of the popular joining techniques in sheet metal industries, since it has some advantages over other techniques such as welding and diffusion bonding, e.g., any dissimilar metals are easily adhesive-bonded together, and the adhesive layer existing between the two sheet metals can play the role of vibration damping. Usually, press-formed sheet metal elements are jointed together at the final stage of assembly. However, if it could be possible to press-form adhesive-bonded flat sheet metals into the final products, this would be an excellent technique from the viewpoint of high productivity. In the present work, the plastic bending of adhesive-bonded sheet metals was investigated by performing V-bending experiments. A serious problem encountered in the V-bending was bending-induced large transverse shear deformation of the adhesive layer, which leads to geometrical imperfection of the bent sheets (so-called ‘gull-wing’ bend), and in some extreme cases, it causes the delamination of the sheet. It was found both from experimental observations and from elasto-plastic stress analysis that the large shear deformation progresses rapidly only at the final stage of V-bending. Consequently, the air-bending operation for adhesive-bonded sheet metals is recommended for suppressing the shear deformation of the adhesive layer to within an acceptable limit.