含脱层复合材料层合杆在轴向应力波作用下的动态屈曲  

DYNAMIC BUCKLING OF LAMINATED COMPOSITE BAR WITH DELAMINATION SUBJECT TO AXIAL STRESS WAVES

作　　者：唐文勇[1] 陈国胜[1] 张圣坤[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室,上海200030

出　　处：《振动与冲击》2007年第2期14-17,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(10202013)

摘　　要：研究了有限长、含脱层损伤复合材料层合直杆受轴向阶跃载荷作用的弹性动力屈曲问题。将含脱层损伤复合材料层合直杆的屈曲问题归结为由轴向应力波传播导致的分叉问题,并考虑了应力波反射的影响。给出了分叉发生的临界条件。研究了脱层长度、铺层角度对动力屈曲的影响。分析结果表明脱层损伤极大的降低了复合材料直杆的极限动力承载能力。The dynamic buckling problem of finite length laminated composite bar with delamination subject to axial step load is investigated.The buckling problem is converted to a bifurcation problem caused by propagation and reflection of axial stress waves.With the aid of bifurcation theory,the theoretical bifurcation condition is derived.The present paper is mainly focused on the effect of delamination length and angle-ply on the dynamic buckling behaviour of composite bar.The numerical results indicate that the delamination reduces the dynamic bearing capacity.

关 键 词：复合材料层合杆 脱层 应力波 分叉 动态屈曲 

分 类 号：O347.2[理学—固体力学]