以复合材料结构抗弹性能分析与设计为目的,根据纤维的线弹性假设和基体的粘弹性假设,推导了复合材料单向板的粘弹性本构关系,导出了高应变率下复合材料层板的一阶剪切理论,建立了复合材料整体化加筋壁板高速冲击有限元分析模型.该模型引入界面单元模拟复合材料层间分层以及筋条与壁板间的脱粘损伤,结合Hashin失效准则进行筋条和单层板面内损伤识别,引入材料刚度退化,采用非线性有限元方法,研究了复合材料加筋结构高速冲击的破坏过程及损伤特性.数值分析结果与实验结果吻合良好,证明了该方法的合理有效性.探讨了筋条参数对高速冲击损伤的影响规律,获得了一些有价值的结论.
In order to analyze the ballistic characteristics of composite structures, a rate-dependent constitutive model is developed to simulate the response of the uni-directional fiber reinforced composite under high velocity impact based on the assumption that the fiber is linear-elastic and the matrix is visco-elastic. The first-order shear deformation laminate theory is deduced at high strain rate. A finite element model is established to simulate the ballistic response of the stiffened composite panel. In this model, the cohesive elements are used to simulate the delamination of the composite panel and debonding between the composite panel and the stiffener. The Hashin's failure criteria are used to predict the inplane failure of the stiffener and composite panel by replacing quasi-static strength properties with rate-dependent strength properties. By using a degradation constitutive model of the mechanical properties, the damage of a stiffened composite panel under high velocity is simulated. The numerical results agree well with the experimental results. Parametric studies are conducted to study the effect of the stiffener parameters on the damage of the stiffened composite panel. A number of valuable conclusions are obtained.
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