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贴补复合材料层合板在压缩载荷作用下的屈曲破坏强度及其损伤演化过程对于复合材料结构修理具有重要意义。本文基于应变和黏聚区模型(CZM)建立了贴补复合材料层合板的渐进损伤分析模型,引入复合材料与胶层的损伤判据和刚度退化方案,计算了结构屈曲强度。数值仿真结果和实验数据吻合较好,验证了模型的有效性。基于该模型,采用非线性有限元方法研究了压缩载荷下双面贴补复合材料层合板的屈曲损伤演化过程,并讨论了补片参数对结构屈曲强度的影响。研究结果表明:双面贴补复合材料层合板屈曲后,处于拉伸和压缩状态下的铺层中的损伤程度存在差异;增大补片直径与厚度可以在一定程度上提高双面贴补复合材料层合板的屈曲强度。
The buckling failure strength and damage evolution process of composite laminates under compressive loading are of great significance to the structural repair of composite materials. Based on the strain and cohesion zone model (CZM), a progressive damage analysis model of composite laminates is established. The damage criterion and stiffness degeneration scheme are introduced to calculate the buckling strength of composite laminates. The numerical simulation is in good agreement with the experimental data, which verifies the validity of the model. Based on the model, the nonlinear finite element method was used to study the buckling damage evolution of the double-sided composite laminates under compressive loading. The influence of the parameters of the patch on the buckling strength was also discussed. The results show that the degree of damage in the ply under tension and compression is different after the buckling of the double-faced ply composite laminates, and the increase of the diameter and thickness of the ply can improve the adhesion of the double- Buckling strength of plywood.