ABSTRACT

Strength prediction of bonded joints remains a challenging task made even further complicated for hybrid joints in which adhesive is supplemented by mechanical fasteners. The present paper complements a series of experimental investigations on hybrid joints combining adhesive bonding with pre-tensioned bolts on galvanised and coated steel substrates, and considering two adhesives. The paper starts with modelling the strength of the bonded connection under the simultaneous action of tensile and compressive normal stresses, and shear. It then presents how these data are moulded into appropriate failure criteria and used the latter as input data for a subsequent full probabilistic finite element analysis. Following the paths of Weibull and subsequent researchers, joint capacity is predicted with reasonable accuracy for a dozen different combinations of substrates, adhesive, and pre-tension level – for which, on average, an accuracy slightly below 10% has been achieved. The results deliver meaningful insights into the subtle relationship between adhesive bonding, mechanical fastening, failure criteria, and resulting predictions methods.

摘要

粘合接头的强度预测仍然是一项具有挑战性的任务，对于其中粘合剂由机械紧固件补充的混合接头来说更加复杂。本文补充了对混合接头的一系列实验研究，将胶粘剂与镀锌和涂层钢基材上的预张紧螺栓结合起来，并考虑了两种粘合剂。本文首先对在拉伸和压缩正应力以及剪切同时作用下的粘合连接的强度进行建模。然后介绍如何将这些数据塑造成适当的失效标准，并将后者用作后续全概率有限元分析的输入数据。沿着 Weibull 和随后的研究人员的路径，对于基材、粘合剂和预张力水平的十几种不同组合，以合理的准确度预测接头承载力——平均而言，准确度略低于 10%。结果为粘合剂粘合、机械紧固、失效标准和由此产生的预测方法之间的微妙关系提供了有意义的见解。