含分层损伤复合材料层合板声激励下振动特性研究

本文通过对含厚度方向不同位置椭圆分层层合板结构动力分析,讨论平面声波激励对结构动力响应特性的影响,基于分层损伤结构变形特点,将含损伤层合板的基板和上下子板采用Mindlin板单元离散,而分层损伤区以虚拟连接单元模拟,根据耗散能的计算确定结构的模态阻尼特征,建立含损伤层合板的振动响应函数的有限元分析方法,用算例验证模型的可信性,在0-1000Hz范围内,计算了含厚度方向不同位置椭圆分层损伤层合板结构的固有频率、模态阻尼和幅频响应与相频响应,依据计算结果分析了分层损伤对动力特性的影响,有益于进一步对分层损伤建立识别模式.

Effect of plane wave excitation on vibration behavior of laminated composite plate with delamination

The effect of harmonic plane wave excitation on the vibration behavior is investigated through the analysis of a composite laminated plate with elliptical delamination at different thickness.According to the deformation characteristics of the damaged structure,the delamination model of the base plate and the upper and lower sub-plates is created using Mindlin plate elements.Virtual interface elements are used in the delaminated region.The structural damping characteristics are determined on the basis of dissipated energy equivalence.A finite element technique to determine the vibration response function of a laminated plate is established.The natural frequencies,damping ratios,and the amplitude response and phase response are calculated for different frequencies ranging from0to1000Hz to demonstrate the validity of the model.The obtained results are not only useful for a better understanding of dynamic behavior of damaged com-posite plates,but also for the identification of their damage modes.