含脱粘损伤的复合材料加筋板压缩破坏渐进损伤数值分析

Progressive Damage Analysis of Stiffened Composite Panels with Debonding Damage under Compressive Load

本文提出了基于连续损伤力学的复合材料层合加筋壁板渐进损伤分析模型。该模型采用界面单元模拟筋条和壁板之间的连接界面,连接界面和复合材料层板分别采用Quads准则和Hashin准则作为失效判据,基于内嵌连续损伤状态变量的材料刚度退化方案,采用非线性有限元方法,研究了复合材料加筋壁板在压缩载荷下的破坏过程,分析了结构相应失效模式的细观失效机理。数值分析结果与实验数据吻合较好,证明该方法的合理性和有效性,并详细探讨了界面单元关键参数和层板铺设角度对加筋壁板结构力学响应的影响规律,得到了一些富有价值的结论。

Based on the continuum damage theory,a strength analysis model is presented to study the progressive damage of stiffened composite panels subjected to compressive loading by using the nonlinear finite element method.In the model,the debonding failure of the adhesive between the skin and stiffener is considered by adding cohesive elements between the continuum shell elements.Quads failure criteria and Hashin＇s failure criteria are adopted to identify the occurring of damage events of the cohesive elements and the composite panels,respectively.Based on an anisotropic degradation constitutive model of the mechanical properties containing some scalar damage variables,the whole process of damage initiation,propagation and catastrophic failure of the structure was simulated in detail.The calculated values by using the model are well agree with the measured values,showing the effectiveness of the model.Parametric studies are conducted to study the effects of adhesive strength and stacking sequences on the compressive strength of stiffened composite panels,and some valuable conclusions are drawn herein.