标题： 多尺度分析及在接触腐蚀环境下的粘接搭接接头寿命预测 显示英文标题

标题： Multiscale analysis and lifetime prediction of adhesive lap joints in contact with aggressive environments

摘要： 我们制定了一种多尺度模型，用于描述杂质依赖的粘合层内聚断裂。 该模型考虑了三个尺度：i) 在原子尺度上，断裂由原子间分离控制，分离的热力学取决于温度和杂质浓度；ii) 中尺度由粘合层中大量原子平面的集体响应特征，导致强度与厚度有关；此外，杂质从环境中吸收并通过粘合层扩散；iii) 在宏观尺度上，我们关注在静态载荷和恶劣环境作用下的搭接接头。 在此情景下，我们获得了以下封闭形式的解析解：粘合层强度与厚度的关系；边缘裂纹长度（如果有的话）随时间的变化；接头的寿命；以及接头强度随预暴露时间的变化关系。 总体而言，该理论能够很好地捕捉实验观察到的趋势。 最后，我们讨论了如何基于原子计算对模型进行表征，这为系统探索新的材料规范开辟了道路。 显示英文摘要

摘要： We formulate a multiscale model of adhesive layers undergoing impurity-dependent cohesive fracture. The model contemplates three scales: i) at the atomic scale, fracture is controlled by interatomic separation and the thermodynamics of separation depends on temperature and impurity concentration; ii) the mesoscale is characterized by the collective response of a large number of interatomic planes across the adhesive layer, resulting in a thickness-dependence strength; in addition, impurities are uptaken from the environment and diffuse through the adhesive layer; and iii) at the macroscale, we focus on lap joints under the action of static loads and aggressive environments. Within this scenario, we obtain closed form analytical solutions for: the dependence of the adhesive layer strength on thickness; the length of the edge cracks, if any, as a function of time; the lifetime of the joint; and the dependence of the strength of the joint on time of preexposure to the environment. Overall, the theory is found to capture well the experimentally observed trends. Finally, we discuss how the model can be characterized on the basis of atomistic calculations, which opens the way for the systematic exploration of new material specifications.