摘要:
摘 要：【目的】为解决大厚度碳纤维层合板在船海领域中应用的难题，提出一种由薄板组合成型的夹筋夹芯厚板结构。【方法】基于连续损伤力学理论、二维Hashin失效准则和内聚力单元技术建立组合厚板有限元分析模型。首先对比分析组合厚板不同方向弯曲性能，其次通过分析胶层和CFRP的渐进损伤过程，研究组合厚板在垂直筋方向弯曲过程中的破坏行为和失效机制，并讨论胶接强度对组合厚板损伤行为的影响。【结果】相比于顺筋方向，组合厚板垂直筋方向的弯曲刚度更高；在垂直筋方向弯曲过程中，筋板与面板界面处胶层首先出现损伤，并在剪切力作用下迅速扩展，最终形成界面破坏和面板0°铺层纤维撕裂相互促进的混合失效模式。【结论】胶接强度较弱时，胶层先坏；胶接强度较强时，层合板先坏。胶层主要承受Ⅱ型撕裂模式和Ⅲ型撕裂模式下的剪切作用，其中顺筋方向剪切应力是胶层出现初始损伤的主要原因。研究新型组合厚板在垂直筋方向弯曲过程中损伤行为，为大厚度复材夹芯夹筋板在船海主承力结构上的推广应用提供技术参考。
Abstract:
Abstract：[Objectives] To solve the problem of applying thick carbon fiber laminated plates in naval architecture and marine Engineering, a thick plate structure with reinforcing ribs and core material in the middle formed by combining thin plates is proposed. [Methods] Based on the theory of continuous Damage mechanics, two-dimensional Hashin failure criterion and cohesive element technology, the finite element analysis model of composite thick plates is established. Firstly, compare and analyze?the bending performance of composite thick plates in different directions. Secondly, by analyzing the progressive damage process of the adhesive layer and CFRP, the failure behavior and failure mechanism of the composite thick plate during bending in the vertical reinforcement direction are studied, and the influence of adhesive strength on the damage behavior of the composite thick plate is discussed. [Results] Compared with the longitudinal direction, the composite thick plate has a higher Bending stiffness in the direction perpendicular to the stiffener. During the bending process perpendicular to the reinforcing rib direction, the bonding layer at the interface between the rib plate and the panel first appears damaged, and rapidly expands under shear force, ultimately forming a mixed failure mode where interface failure and fiber tearing at the 0 ° ply of the panel promote each other. [Conclusions] When the bonding strength is weak, the bonding layer breaks first; When the bonding strength is strong, the laminated board breaks first. The bonding layer mainly bears the shear action in the II and III tearing modes, and the shear stress in the direction of the reinforcement is the main reason for the initial damage of the bonding layer. Research on the damage behavior of a new type of composite thick plate during bending perpendicular to the stiffener direction, providing technical reference for the promotion and application of thick composite sandwich reinforced plates in ship and sea main load-bearing structures.
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