基于逐层理论的复合材料层合结构分层损伤扩展研究  

Research on Delamination Damage Progressive Growth of Composite Laminated Structures Based on Layerwise Theory

作　　者：李顶河 曹江涛 郭巧荣[1] Li Dinghe;Cao Jiangtao;Guo Qiaorong(Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学,天津300300

出　　处：《航空科学技术》2022年第6期90-102,共13页Aeronautical Science & Technology

基　　金：航空科学基金(20200038067001)。

摘　　要：首先,将虚拟裂纹闭合技术(VCCT)和离散损伤模型(DDZM)引入逐层理论(LWT),建立了含分层损伤复合材料层合结构的三维分析模型,对分层损伤的渐进萌生和扩展行为进行了研究。然后,编写了相应的C++程序,通过与经典文献进行对比,验证本文方法的正确性。最后,基于本文模型模拟了二维和三维复合材料双悬臂梁(DCB)纯I型分层损伤的渐进扩展行为,研究了网格尺寸对数值收敛性的影响,以及界面强度对载荷位移曲线的影响规律。本文方法将三种理论优势融合起来,使逐层理论可用于解决复合材料分层损伤扩展的问题,并且很大程度上提高了计算效率。Firstly, the Virtual Crack Closure Technique(VCCT) and Discrete Damage Zone Model(DDZM) is introduced into the layerwise theory to establish a three-dimensional analytical model for the composite laminated structures with delamination. The progressive growth and propagation behavior of delamination damage are investigated. And then, the corresponding C++ code is developed, and the proposed method is verified by comparing with the classical literatures. Finally, the numerical examples of the type I delamination extension behaviors in the Double Cantilever Beam(DCB) and 3D DCB are investigated. And the effect of mesh size on convergence and the interface strength on the results of the load-displacement curve are investigated. The proposed method combines the advantages of three theoretical schemes, and the layerwise theory is extended into the delamination growth, and the calculation efficiency is improved.

关 键 词：逐层理论 虚拟裂纹闭合技术 离散损伤模型 双悬臂梁 分层损伤 

分 类 号：TB332[一般工业技术—材料科学与工程]