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中文摘要：
根据腐蚀产物化学特性和板壳理论，建立搭接件接触面腐蚀厚度与枕垫应力定量关系的数学模型。在此基础上，利用非线性有限元软件MSC．Marc分析枕垫应力对搭接结构完整性的影响。分析时考虑螺栓与孔壁间的非线性接触、摩擦、干涉配合、材料损失、枕垫应力及几何非线性等因素影响。模拟结果表明，搭接件的最大应力点位置随腐蚀水平的增加而变化，腐蚀初期和腐蚀量大于4％时，搭接件应力对枕垫应力比较敏感。随着腐蚀程度的加重，内表面裂尖应力强度因子随之增大，而外表面裂尖应力强度因子随之减小。另外，分析腐蚀对搭接件的影响时，只考虑蒙皮厚度的变化，而不考虑枕垫应力得出的结果是保守和危险的。计算结果和结论可作为该类结构损伤容限设计的参考依据。
英文摘要：
According to chemical characterization of corrosion products and theory of panel, the mathematical model is developed that correlate the amplitude of the pillowing stress of lap joints to the degree of corrosion inside the joint. Based on mathematical model, the three-dimensional（3-D）finite element（FE）model of bolted joint has been developed using the non-linear finite element code MSC Marc. More Issues such as the friction between the joint parts, and pre-stress, and material loss, and pillowing stress et al are taken into account. The results show that corrosion pillowing can significantly increase the stress in lap joint. The stress of lap joint is sensitive to pillowing stress in early corrosion or corrosion level is higher than 4%. The stress intensity factors for the crack edge along the faying surface increased as the pillowing increased while the crack edge along the outer surface decreased. In addition, the analyses show that the locations of maximum stress of lap joint will change with the material loss increasing. Simulating the effect of corrosion on lap joint only by reducing the panel thickness will result in no conservative life estimates if corrosion pillowing is ignored. The simulated results may be serving as reference for damage tolerance design of the similar structures.
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