含单分层损伤复合材料层合梁的动力屈曲研究

DYNAMIC BUCKLING OF LAMINATED COMPOSITE BEAMS WITH SINGLE DELAMINATION DAMAGE

采用有限差分(FDM)方法求解了含初始缺陷和单个分层损伤复合材料层合梁的轴向刚性质量块撞击的脉冲动力屈曲问题。基于Hamilton原理导出了考虑所有惯性影响以及一阶横向剪切变形(FSDT)影响时单个分层损伤复合材料梁的非线性动力屈曲控制方程;采用B-R准则判断梁动力屈曲时刻,同时确定刚性质量块的临界冲击速度。重点研究脱层、冲击速度、初始几何缺陷等因素对复合材料层合梁脉冲动力屈曲的影响。

The dynamic buckling of laminated composite beam with single delamination damage, as well as initial geometric imperfections, under the impact by a rigid body was simulated by the finite difference method (FDM). The nonlinear governing equations of dynamic buckling are derived by Hamilton principle, in which all inertia effects and the First-Order shear deformation (FSDT) affecting the dynamic buckling are considered. The B-R dynamic buckling criterion is employed to predict the onset of dynamic buckling and determine the critical impact velocity of the striking mass. The investigation is mainly focused on the effects of delamination,impact velocity as well as initial geometric imperfection on the dynamic buckling behaviour of composite beams.