Considering the aerospace sector, the use of adhesively bonded joints is constantly increasing over the last decades. Due to its lightweight and capability of joining various materials with different coefficient of thermal expansion, this joining technique offers many benefits over conventional methods like rivets, screws and welding. On the other hand, structural adhesives consists of polymer chains that can be severely affected by the environment. An example of such an environmental effect is the interaction of the polymer chains of the adhesive with ionizing radiation in space. Nevertheless in the literature, the influence of ionizing radiation on the mechanical properties of epoxides is covered but not well understood. The present work describes a method of determining the stiffness of an adhesively bonded single lap joint (SLJ) using closed form solution equations. This analytical approach is compared with a numerical model. The mechanical properties of the adhesive in both models is degraded due to irradiation, based on experiments conducted by the European Organization for Nuclear Research (CERN). The results show that the degradation of the mechanical properties of the adhesive layer has a significant influence on the joint stiffness. This effect increases with growing adhesive layer thickness. Comparing the results with a finite element model, it is shown that the developed calculation scheme overestimates the stiffness of the SLJ. This is caused by the neglection of bending stresses within the adherends.

中文翻译：

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空间部门退化单搭接接头的简化刚度分析——比较分析和有限元分析

考虑到航空航天领域，胶粘接头的使用在过去几十年中不断增加。由于其重量轻且能够连接具有不同热膨胀系数的各种材料，这种连接技术与铆钉、螺钉和焊接等传统方法相比具有许多优点。另一方面，结构粘合剂由聚合物链组成，会受到环境的严重影响。这种环境效应的一个例子是粘合剂的聚合物链与空间电离辐射的相互作用。然而，在文献中，电离辐射对环氧化物机械性能的影响被涵盖但并未得到很好的理解。目前的工作描述了一种使用封闭形式求解方程确定胶粘单搭接接头 (SLJ) 刚度的方法。将该分析方法与数值模型进行比较。根据欧洲核研究组织 (CERN) 进行的实验，两种模型中粘合剂的机械性能都会因辐照而降低。结果表明，胶层力学性能的退化对接头刚度有显着影响。这种效果随着粘合剂层厚度的增加而增加。将结果与有限元模型进行比较，表明开发的计算方案高估了 SLJ 的刚度。这是由于忽略了被粘物内的弯曲应力造成的。将该分析方法与数值模型进行比较。根据欧洲核研究组织 (CERN) 进行的实验，两种模型中粘合剂的机械性能都会因辐照而降低。结果表明，胶层力学性能的退化对接头刚度有显着影响。这种效果随着粘合剂层厚度的增加而增加。将结果与有限元模型进行比较，表明开发的计算方案高估了 SLJ 的刚度。这是由于忽略了被粘物内的弯曲应力造成的。将该分析方法与数值模型进行比较。根据欧洲核研究组织 (CERN) 进行的实验，两种模型中粘合剂的机械性能都会因辐照而降低。结果表明，胶层力学性能的退化对接头刚度有显着影响。这种效果随着粘合剂层厚度的增加而增加。将结果与有限元模型进行比较，表明开发的计算方案高估了 SLJ 的刚度。这是由于忽略了被粘物内的弯曲应力造成的。基于欧洲核研究组织 (CERN) 进行的实验。结果表明，胶层力学性能的退化对接头刚度有显着影响。这种效果随着粘合剂层厚度的增加而增加。将结果与有限元模型进行比较，表明开发的计算方案高估了 SLJ 的刚度。这是由于忽略了被粘物内的弯曲应力造成的。基于欧洲核研究组织 (CERN) 进行的实验。结果表明，胶层力学性能的退化对接头刚度有显着影响。这种效果随着粘合剂层厚度的增加而增加。将结果与有限元模型进行比较，表明开发的计算方案高估了 SLJ 的刚度。这是由于忽略了被粘物内的弯曲应力造成的。