ABSTRACT

The market requirements impose searching for new joining solutions, which must be simple and effective. Adhesive joints are currently used, for example in the automotive and aeronautical industries, since welding is not possible in many cases and because drilling the base materials is not required. To analyse adhesive joints, the Finite Element Method (FEM) is increasingly used. The Extended Finite Element Method (XFEM) is able to predict crack growth and joint strength in adhesive structures. However, there are still not many case studies about its suitability. On the other hand, hybrid joints, which combine spot-welding with adhesive bonding, are being increasingly used in different industries. This study has the purpose of validating the XFEM to predict the performance of T-peel hybrid joints between DIN C45E steel adherends under tensile loads. A comparison is made with spot-welded and adhesive joints. Three adhesives are tested (Araldite® AV138, Araldite® 2015 and Sikaforce® 7752). Different damage initiation and growth criteria, and also damage law shapes, were evaluated for strength and dissipated energy predictions. The joints’ performance was found to highly vary between adhesives and bonding method, and the XFEM analysis is accurate for specific modelling conditions.

摘要

市场要求要求寻找新的连接解决方​​案，这些解决方案必须简单有效。目前在例如汽车和航空工业中使用粘合接头，因为在许多情况下无法进行焊接并且不需要对基材进行钻孔。为了分析粘合接头，越来越多地使用有限元法 (FEM)。扩展有限元法 (XFEM) 能够预测粘合剂结构中的裂纹扩展和接头强度。然而，关于其适用性的案例研究仍然不多。另一方面，将点焊与粘合剂结合在一起的混合接头正越来越多地用于不同行业。本研究旨在验证 XFEM 以预测 DIN C45E 钢粘附体之间的 T 型剥离混合接头在拉伸载荷下的性能。对点焊和粘合接头进行了比较。测试了三种粘合剂（Araldite® AV138、Araldite® 2015 和 Sikaforce® 7752）。针对强度和耗散能量预测评估了不同的损伤起始和增长标准，以及损伤规律形状。发现接头的性能在粘合剂和粘合方法之间存在很大差异，并且 XFEM 分析对于特定的建模条件是准确的。