缝纫对复合材料层合板分层屈曲的影响  

Effects of Stitcing on the Buckling Strength of Stitched Composite Laminates

作　　者：魏玉卿[1] 陈斌[2] 

机构地区：[1]青岛建筑工程学院数理系,山东青岛266033 [2]重庆大学工程力学系,重庆400030

出　　处：《重庆大学学报（自然科学版）》2004年第7期24-27,共4页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(10272120);青岛建筑工程学院基金资助项目(C2003-133)

摘　　要：基于包含若干分层的缝纫复合材料层合板在面内压缩载荷作用下发生屈曲破坏的机理,即厚度方向上的缝纫线被拉断,把缝纫线的极限伸长率作为层合板屈曲破坏的控制参数,采用能量的方法建立了用于预测缝纫复合材料层合板屈曲强度的理论模型。采用最小势能原理计算了缝纫及未缝纫复合材料层合板的屈曲强度。在此基础上,定义一个缝纫增强比,用一个算例证明了缝纫复合材料层合板较未缝纫复合材料层合板有更高的屈曲强度。研究了缝纫参数(包括缝纫线直径,缝纫针距和行距)对缝纫复合材料层合板屈曲强度的影响。A theoretic model is proposed based on the mechanism of the buckling failure of the stitched composite laminates containing delaminations. The buckling strength of the stitched composite laminates under the in-plane compressive load is predicted. The critical percentage elongation of the stitching thread is taken into account as a control parameter of the buckling failure. The energy method is used to calculate the buckling strength of the stitched composite laminates, and the minimal potential energy is used to calculate that of the unstitched composite laminates. The result shows that the buckling strength of the stitched composite laminates is larger than that of the unstitched composite laminates. The effects of stitching technical parameters such as the stitch thread diameter, stitch step and stitch space on the stitched composite laminates are also analyzed.

关 键 词：缝纫 复合材料 层合板 分层 屈曲强度 

分 类 号：O344.3[理学—固体力学]