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基于层合板Mindlin一阶剪切变形理论,研究了多处分层损伤对复合材料层合板固有特性的影响规律。根据一般分层模型,并采用线性接触模型模拟分层区域上、下子板的相互作用,建立含多个椭圆内埋型分层损伤平面编织层合板自由振动分析有限元模型。通过典型算例分析,讨论了椭圆分层区域长轴与试件纵向夹角对平面编织层合板固有频率的影响。结果表明,对于内埋型分层损伤,表面分层与中间分层对固有频率的影响区别很小;分层区域的长轴与试件纵向夹角越大,损伤对固有频率的影响越大。
Based on the Mindlin first-order shear deformation theory of laminates, the influence of multiple delamination damage on the inherent properties of the composite laminates was studied. According to the general stratification model, the linear contact model was used to simulate the interaction between upper and lower sublayers in the stratified zone. The finite element model of free vibration analysis of flat braided laminate with multiple elliptical buried stratified damage was established. The influence of the long axis of ellipse layered region and the longitudinal angle of specimen on the natural frequency of planar braided laminate is discussed through a typical example analysis. The results show that the influence of surface stratification and middle stratification on the natural frequency is insignificant for the buried stratified damage. The larger the included angle between the long axis of the stratified zone and the longitudinal direction of the specimen, the greater the impact of damage on the natural frequency .