含分层损伤复合材料层合板剩余压缩强度研究

Study of Residual Compression Strength of Composite Laminates with Delamination

准确预测含分层损伤层合板的剩余压缩强度，对复合材料具有十分重要的意义。本文基于层合板一阶剪切理论，建立了一种考虑复合材料多种损伤的含分层层合板刚度退化模型，通过数值算例分析了分层屈曲临界载荷与材料强度极限的关系以及刚度退化对含分层层合板前后屈曲行为的影响。

Predicting residual compression strength of composite laminates with delaminatio n is a very important research subject for Engineering composite structure desig ners. Based on first order shear deformation theory and Von-Karman large deformation expressions, a modified stiffness degradation model for laminates with multi-damages is established in this paper. From some typical numerical examples, the relationship between buckling load and material strength is investigated, and the effect of stiffness degradation on the pre-buckling and post-buckling behavior of delaminated laminates is also discussed with the present model. The numerical model, method and corresponding discussion conclusions would be useful for designers of composite engineering structures.