含损复合材料结构的损伤扩展、破坏和承载能力

Study of compressive failure mechanism and residual loaded capability for the damaged composite sandwich and stiffened structures is of extremely importance in designing and maintaining the composite engineering structures. If without considering the effect of damage, the design process would be reduced a trial and error process. The present study is based on the both theoretical mechanism analysis and numerical simulation. The research aspects involve as:1..Establishing a set of analysis models for describing multi-failure characteristics,pre-buckling, post-buckling and progressive failures etc. processes via experiment observation; which are included face/core debonded and base plate/ stiffener delamination models; damage bridging model; multi-scalar damage constitutive model for matrix crack, contact model around delamination region, delamination growth, and last collapse etc.;2.Constructing a finite element bank for damage and failure analysis;3.Providing a structural analysis method based on a Global - Local principal.;4.Developing a corresponding finite element analysis code.;5.Predict the whole Failure process and residual loaded capacity of some typical damaged composite structures through parametrical investigation The study would be benefit to get a better understanding for failure mechanism and residual loaded capacity, furthermore, to provide the analysis theory and method for establish damage tolerance standard of the damaged composite engineering structures after low energy impact. .26 papers have been published during 3 academic years.

以典型含损复合材料结构（加筋板和夹层板）为背景，研究在压缩或剪切载荷作用下，损伤扩展和破坏的机理，包括分层前缘接触和桥联，分层位置、尺寸、分布和结构几何、支承条件与多种损伤扩展和破坏模式之间的关系，并预测结构剩余承载能力，发展含损复合材料结构的有限元分析理论、方法和软件，力图从力学原理上为此类结构设计和失效防范提供依据。