ABSTRACT

In the present paper, the strength and interfacial properties of square-wave joints under tension are analyzed. By using the bilinear cohesive zone model, three main factors in practice, including geometric parameters, preexisting defects and mismatches, are considered. It is found that the strength and fracture toughness of the joints can be improved by proper adjustment of geometric parameters of the joint. What is more, the length of defect has a great influence on the mechanical properties of the adhesive joints, different from the defect’s location. Compacting adherends tightly during glue consolidation, making the bonding part as symmetrical as possible and introducing some protuberances on square-wave plug are found to be helpful to improve the joints’ mechanical behavior. The findings should be useful for the design of square-wave joints and the assessment of mechanical properties of adhesive joints in practical and potential applications.

摘要

本文分析了受拉方波接头的强度和界面特性。通过使用双线性内聚区模型，在实践中考虑了三个主要因素，包括几何参数、预先存在的缺陷和不匹配。研究发现，通过适当调整接头的几何参数，可以提高接头的强度和断裂韧性。此外，缺陷的长度对粘接接头的力学性能有很大的影响，不同于缺陷的位置。发现在胶水固结过程中将被粘物紧密压实，使粘合部分尽可能对称，并在方波塞上引入一些突起有助于改善接头的机械性能。