An explicit cohesive element combining cohesive failure of the adhesive and delamination failure in composite bonded joints
An explicit cohesive element combining cohesive failure of the adhesive and delamination failure in composite bonded joints
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DOI：
10.1016/j.compstruct.2016.03.009
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发表时间：
2016-06
影响因子：
6.3
通讯作者：
J. Neumayer;H. Koerber;R. Hinterhölzl
中科院分区：
文献类型：
--
作者：
J. Neumayer;H. Koerber;R. Hinterhölzl
在碰撞模拟中，分层会显著改变粘接接头的机械性能。提出了一种内聚单元，可以在全尺寸结构水平上模拟胶接接头中的分层失效。该方法的原理是计算整个厚度的被粘体的应力解析内的凝聚力的元素表示的完整的胶粘剂的凝聚行为。通过基于应力的相互作用准则，可以检测被粘物中的分层。分层破坏是由一个适应的凝聚力定律实现的，新的凝聚力单元通过一个单搭接接头的几何形状进行了数值验证。结果表明，良好的相关性与传统的凝聚力区建模时，发生的粘合剂的内聚破坏。该模型能较好地预测分层的发生，并能较保守地近似计算接头强度。改进了模型的收敛性。数值效率高，能够代表粘合剂的内聚失效和结构水平上的分层失效。
Delaminations can change the mechanical behaviour of bonded joints significantly in crash simulations. A cohesive element is presented that enables the simulation of delamination failure in bonded joints on a full scale structural level. The principle of the approach is to compute the through thickness stresses of the adherends analytically within the cohesive element representing the cohesive behaviour of the complete adhesive. Via a stress based interaction criterion it becomes possible to detect delamination in the adherends. The delamination failure is implemented by an adaptation of the cohesive law.The new cohesive element is validated numerically by a single lap joint geometry. The results show good correlation with a conventional cohesive zone modelling when cohesive failure of the adhesive occurs. It can well predict the delamination initiation and approximates the joint strength conservatively. The convergence behaviour of the model is improved. The numerical efficiency is high and enables a representation of both cohesive failure of the adhesive and delamination failure on a structural level.