The strength of the adhesively bonded step-lap joints for different step numbers
The strength of the adhesively bonded step-lap joints for different step numbers
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DOI：
10.1016/j.compositesb.2014.06.023
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发表时间：
2014-12-01
影响因子：
13.1
通讯作者：
Akpinar, Salih
中科院分区：
文献类型：
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作者：
Akpinar, Salih
承受静态拉伸载荷的粘合单搭接接头的搭接区域边缘处产生的剥离应力对接头的损坏具有深远的影响。搭接区域边缘处形成的应力值的减小或这些应力转移到搭接区域的中间部分会增加接头的强度。在这项研究中，通过保持所有测试样品的粘合面积相同，对单搭接接头 (SLJ)、一级搭接接头 (OSLJ) 和三阶搭接接头 (TSLJ) 承受拉伸载荷的机械性能进行了实验和数值检验。在用于实验研究的样品中，使用AA2024-T3铝合金作为粘合剂，同时分别应用柔性粘合剂SBT9244和刚性粘合剂DP460。对三种不同接头类型进行实验研究后，考虑胶粘剂和被粘物的几何非线性和材料非线性，采用三维有限元方法对接头进行应力分析。结果，观察到一步式搭接几何形状减少了重叠区域边缘处产生的应力集中，而三步式搭接几何形状的降幅最大。此外，应力值的减少量支持实验获得的接头承载能力的增加。 (C) 2014 Elsevier Ltd. 保留所有权利。
Peel stresses developing at the edges of the overlap area of the adhesively bonded single lap joints subjected to static tensile loading have a profound effect on the damage of the joint The reduction in the stress values formed at the edges of the overlap area or the transfer of these stresses to the middle part of the overlap area increase the strength of the joint. In this study, mechanical properties of the single lap joint (SLJ), one step lap joint (OSLJ) and three step lap joint (TSLJ) subjected to tensile loading were examined experimentally and numerically by keeping the bonding area same for all samples examined. In the samples produced for experimental study, AA2024-T3 aluminum alloy was used as adherent, while a flexible adhesive SBT9244 and a stiff adhesive DP460 were applied separately. After experimental studies on the three different joint types were conducted, stress analyses in the joints were performed with a three-dimensional finite element method by considering the geometrical non-linearity and the material non-linearities of the adhesive and adherend. As a result, it was observed that one-step lap geometry reduces the stress concentration developing at the edges of the overlap area while the highest decrease occurred in the three-step lap geometry. Additionally, the amount of reduction in the stress values supports the increase in the experimentally obtained load carrying capacity of the joint. (C) 2014 Elsevier Ltd. All rights reserved.