【摘要】 对冲击载荷作用下复合材料梁 板脱层前后的非线性动力学响应进行了分析 .基于四分区梁板脱层模型 ,利用Galerkin法和Wilson θ法对梁板在脱层前后的非线性动力响应进行了求解 .分析表明在冲击荷载作用下产生突然脱层的梁扳 ,其在脱层前后的动力学性态有明显变化 :脱层后系统的频率比脱层前系统频率低 ;系统的各种动力响应量 (位移、速度、加速度 )均增大 ,而且这种变化在脱层的区域比在未脱层的区域显著 .最后 ,将有限元方法和本文的方法进行了对比 ,结果表明二者相当吻合 .更多还原

【Abstract】 This paper analyzes the nonlinear dynamic responses of a beam-plate to impulsive loading during the pre-and post-delamination of the beam-plate. The responses of the beam-plate undergoing pre-and post-delamination are derived by modeling the delaminated beam-plate in four regions and then using Galerkin method and Wilson-θ method. The delamination determines the dynamic behavior of the beam-plate: the frequency of the undelaminated beam-plate is lower than that of the delaminated beam-plate; after delamination, the dynamic response parameters, such as the displacement, velocity and acceleration, all rise. And the rise is more obvious in the delaminated region than in the undelaminated region. Finally, the numerical results thus obtained are compared with those obtained by using FEM, and they turn out to be identical.更多还原