复合材料层合梁在横向线载荷下的脱层扩展  

Delamination Growth for Composite Laminated Beams Subjected to Transverse Linear Load

作　　者：杨金花[1] 傅衣铭[2] 

机构地区：[1]长沙理工大学,湖南长沙410076 [2]湖南大学,湖南长沙410082

出　　处：《应用力学学报》2009年第4期679-684,共6页Chinese Journal of Applied Mechanics

基　　金：湖南省教育厅科研资助项目(09C056)

摘　　要：基于可动边界变分原理对层合梁脱层扩展进行了分析;考虑了脱层间的接触效应,建立了层合梁在横向线载荷作用下的非线性控制微分方程及相应的定解条件;应用Griffith准则导出了脱层前缘各点处的能量释放率表达式;通过算例讨论了脱层长度、脱层深度、几何尺寸、材料性质等因素对脱层扩展的影响。研究表明:脱层越长、越深、横向载荷越大,脱层越容易扩展;梁的长高比L/h及材料的E11/E22越大,脱层越不易发生扩展。Delamination growth may occur in layered beams under transverse pressure to induce a structure failure. Considering the variational principle of moving boundary and the contact effect between delamination regions, the nonlinear governing equations for delaminated beams subjected to transverse linear load are derived, and the corresponding boundary and matching conditions are given. According to the Griffith criterion, the formulas of energy release rate along the delamination front are obtained and the delamination growth is investigated. In the numerical calculation, the effects of delamination sizes and depths, the geometrical parameters and the material properties on delamination growth are discussed. It is shown that the tendence possibility of delamination growth develops with the increasing delamination length, depth and the transverse load, and abates with the increasing ratio of L/hand the E1 1/E22 of materials.

关 键 词：复合材料 层合梁 脱层扩展 能量释放率 接触效应 

分 类 号：O343[理学—固体力学]