具有分层损伤的不同加筋形式复合材料层合板的后屈曲性态研究

基于板的一阶剪切理论和V on-K arm an大挠度理论,分别推导了复合材料层合板和层合梁的几何非线性有限元列式,提出了含嵌入分层的复合材料加筋层合板在受压缩载荷作用下的后屈曲有限元分析方法,对在板厚方向具有不同分层位置的加筋板结构进行了有限元数值分析,研究了不同的加筋方式及筋的分布对具有分层损伤的复合材料加筋层合板的后屈曲性态的影响,所得结果对确定在压缩载荷作用下含损伤复合材料加筋层合板的剩余承载能力具有参考价值。

Study on postbuckling behavior of delaminated composite plastes with different stiffeners

The postbuckling behavior of stiffened composite plates with delamination damage under uniform compression is investigated by finite element method.The linear and non-linear finite element formulae for both laminated face and stiffeners are constructed on the basis of the Mindlin first order shear effect theory and Von-Karman non-linearity deformation assumption,and a finite element code is developed.In numerical examples,the influences of the distribution of the stiffeners,the location of the delamination and the boundary conditions of the composite stiffened plates upon postcbuckling behavior of the composite stiffened plates are discussed.The numerical results show that postbuckling behavior of stiffened composite plates with delamination is much more complicated.The method and conclusions provided in the paper are useful for engineers of composite structure.