复合材料单钉接头三维逐渐损伤破坏分析

针对纤维增强复合材料螺栓双盖板接头, 发展了面内静拉伸三维逐渐损伤模型。并对损伤累积过程中出现的四种基本损伤机理类型(纤维断裂、纤维-基体剪切、基体开裂、分层) 及其之间的相互关联性进行了分析模拟, 并能成功预测其接头层合板静拉伸强度、破坏模式及损伤与扩展的整个过程。同时用参数化设计方法, 对任意铺层、任意尺寸单钉接头进行建模, 使分析工作更加方便。用本模型计算的结果与文献 4 ]提供的9 种不同铺层尺寸接头实验结果进行了比较分析, 对比结果非常令人满意。 

THREE-DIMENSIONAL PROGRESSIVE DAMAGE ANALYSIS OFSINGLE FASTENER JOINTS IN COMPOSITE LAMINATES

A three-dimensional progressive damage model was developed for predicting the damage accumulation of bolted double-lap joints in fibre-reinforced plastics under in-plane tensile loading. The model is capable of simulating the four damage mechanisms and the correlation among them that are fibre breakage, fibre-matrix shearing, matrix cracking and delamination, which is also capable of assessing the ultimate tensile strength of the joints and of simulating the whole process of failure initiation, propagation and catastrophic failure of the structure. The parametric method was also used for bolted joints in laminated composites with arbitrary lay-ups and geometries. Nine different joints were used to predict the ultimate strength of the joints and analyze damage progression. An excellent agreement was found between the analytical predictions and the experimental data of the document.