复合材料层合板阶梯型胶接修补斜度有限元数值模拟研究  

Research on stepped cohesive joint repair slope of composite laminates based on finite element numerical simulation

作　　者：余芬[1] 郭拓 刘武帅 安伯宁 邓殿凯 何振鹏 YU Fen;GUO Tuo;LIU Wushuai;AN Boning;DENG Diankai;HE Zhenpeng(Aeronautical Engineering Institute,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学航空工程学院,天津300300

出　　处：《航空材料学报》2020年第4期99-108,共10页Journal of Aeronautical Materials

基　　金：国家自然科学基金项目(U1633123,U1433202);天津市自然科学基金项目(18JCQNJC05400);中国民航局科技计划资助项目(MHRD20160106);中央高校基金(3122018D014);天津市教委自然科学项目(2018KJ240)。

摘　　要：建立阶梯型胶接修补结构的渐进损伤分析模型,研究阶梯型胶接修补后层合板在轴向拉伸载荷作用下的极限承载强度及失效模式,并进一步研究不同斜度下的修补工艺对修补后层合板强度的影响。通过编写VUMAT子程序,分别设置母板和补片的失效准则及刚度退化模型,选用Cohesive单元模拟胶层,完成复合材料层合板阶梯型胶接修补结构的渐进损伤分析。结果表明:极限拉伸强度随斜度的减小而增大,但当斜度为1∶20或更小时,强度恢复率变化不大;层合板0°铺层连接处的胶层最先发生损伤并沿垂直于施载方向扩展,直至失效,继而引起层合板和补片的损伤;胶层有效胶接面积随斜度的减小而增大,有效缓解应力集中现象;层合板基体拉伸失效首先发生在损伤区域最小半径处,纤维拉伸失效首先发生在0°铺层处,并沿垂直于施载方向扩展。The progressive damage analysis model of stepped adhesive repairing structure was established to study the ultimate load-bearing strength and failure mode of laminates under axial tensile load after stepped adhesive repairing, and the effect of different slope repairing technology on the strength of repaired laminate was further studied. By compiling VUMAT subroutine,failure criteria and stiffness degradation models of laminate and patch were set respectively, and cohesive element was selected to simulate the adhesive layer to complete progressive damage analysis of composite laminates with stepped adhesive repair structure.The results show that the ultimate tensile strength increases with the decrease of slope, but the strength recovery rate does not change much when the slope is 1:20 or less. The adhesive layer at the 0° laminate connection first occurs damage and extends along the direction perpendicular to the loading until failure, and then causes the damage of laminate and patch. The effective adhesive area of the cohesive layer increases with the decrease of the slope, which can effectively alleviate the stress concentration phenomenon;The tensile failure of laminate first occurs at the minimum radius of the damage area, and the tensile failure of fibers first occurs at the 0°laminate and then extends perpendicular to the loading direction.

关 键 词：复合材料 胶接修补结构 渐进损伤模型 VUMAT子程序 斜度 

分 类 号：TB332[一般工业技术—材料科学与工程]