In real practice, adhesively bonded structures are usually exposed to cyclic environmental conditions. However, cyclic ageing processes are relatively unexplored. The aim of this study is to consider the effect of cyclic ageing on the rate of water uptake and the drying process in an epoxy-based adhesive. Fick’s law was considered to estimate the water diffusion coefficients for the ageing and the drying steps at different cycles. Different cyclic ageing times have been considered in the ageing procedure. Dogbone shape specimens were also manufactured and subjected to cyclic aging to investigate the tensile properties of the tested adhesive as a function of aging cycles. The gravimetric results showed that the rate of water uptake and drying is mainly a function of the level of water uptake of the first ageing cycle. Tensile test results showed that the maximum water content increases with each subsequent ageing cycle. It was also found that the Young’s modulus and the tensile strength of the adhesive decreased significantly after the initial ageing cycle, but all subsequent ageing cycles have considerably less influence on the mechanical properties of the adhesive.

在实际实践中，粘合结构通常会暴露在循环的环境条件下。但是，循环老化过程还没有被开发出来。这项研究的目的是考虑循环老化对环氧基胶粘剂的吸水率和干燥过程的影响。考虑了菲克定律来估计不同循环下老化和干燥步骤的水扩散系数。在老化过程中考虑了不同的循环老化时间。还制造了犬骨形样品并进行了循环老化，以研究所测试的粘合剂的拉伸性能与老化周期的关系。重量分析结果表明，水分吸收和干燥的速率主要是第一衰老周期的水分吸收水平的函数。拉伸试验结果表明，最大水含量随每个随后的老化周期而增加。还发现，在初始老化循环后，粘合剂的杨氏模量和拉伸强度显着降低，但是所有随后的老化循环对粘合剂的机械性能的影响都较小。