含脱层损伤复合材料层合梁的冲击动力屈曲

针对含初始缺陷和脱层损伤的复合材料层合梁的轴向冲击动力屈曲问题进行了分析。基于Hamilton原理导出了考虑初始缺陷、轴向和横向惯性、横向剪切变形以及转动惯性影响时含脱层损伤复合材料梁的非线性动力屈曲控制方程;基于B-R准则,采用有限差分方法求解了受轴向冲击载荷作用下含脱层损伤复合材料梁的动力屈曲问题;讨论了冲击速度、初始几何缺陷、铺层角度以及脱层长度等因素对复合材料层合梁动力屈曲的影响。

Dynamic buckling of laminated composite beams with delamination subject to axial impact

The dynamic buckling behaviour of laminated composite beam with delamination,having initial geometric imperfections,subject to an axial impact was investigated in this paper.The nonlinear governing equations of dynamic buckling were developed based on the Hamilton principle with the consideration of beam's initial geometric imperfections,axial and transverse inertia,transverse shear deformation and the cross section's rotational inertia effects.The dynamic buckling of laminated composite beam with delamination was solved numerically by the finite difference method based on the B-R dynamic buckling criterion. Effects of impact velocity,initial geometric imperfection,fibre angle and the length of delamination on the dynamic buckling behaviour of composite beams were also investigated.