铝/CFRP面板蜂窝夹层结构低速冲击特性

Low-velocity impact characteristics of honeycomb sandwich structure with Al/CFRP face-sheets

  • 摘要: 为提高碳纤维增强树脂基复合材料(Carbon Fiber Reinforced Polymer, CFRP)面板蜂窝夹层结构的抗低速冲击性能,针对蜂窝夹层结构面板,采用纤维和金属交替铺层(Fiber Metal Laminates, FML)的思路,设计了四种面密度相近的CFRP/铝叠层结构,并进行了不同冲击能量的低速冲击试验。通过建立低速冲击有限元模型,研究了不同叠层顺序对应力传播的影响以及蜂窝夹层结构的失效过程。同时,对比分析了不同试件面板的损伤形态和极限载荷,并探讨了不同破坏模式下的吸能的规律。研究结果表明,面板的叠层方式显著影响面板的力学特性。在损伤形态方面,表层的铝板损伤表现为沿凹痕向纤维铺层方向扩展的裂纹,而表层的CFRP层失效区域表现为沿纤维方向的脆性断裂。在承载极限方面,Al-CF的叠层方式表现最优,其次是CF-Al-CF,与纯CFRP面板的蜂窝夹层结构相比,这两种叠层方式的极限载荷分别提高了22.18%、5.18%。在能量吸收方面,当面板未被穿透时,FML面板蜂窝夹层结构的能量吸收均高于纯CFRP面板蜂窝夹层结构;当面板发生穿透破坏时,Al-CF、Al-CF-Al、CF-Al-CF叠层结构所需能量分别比纯CFRP面板试样提高了33.6%、19.6%、22.10%。

     

    Abstract: To enhance the low-velocity impact resistance of carbon fiber reinforced resin matrix composite (CFRP) honeycomb sandwich panels, four CFRP/aluminum laminated structures with similar surface densities were designed by adopting the concept of fiber-metal laminates (FML) for the face sheets of the honeycomb sandwich panel, and low-velocity impact tests were conducted using different impact energies. Through the development of a low-speed impact finite element model, the effects of different stacking sequences on stress propagation and the failure mechanisms of honeycomb sandwich structures were investigated. Additionally, the damage morphologies and ultimate loads of panels from various specimens were compared, and the energy absorption characteristics under different failure modes were analyzed. The research findings indicate that the lamination configuration of the panel significantly influences its mechanical properties. In terms of damage morphology, cracks in the surface aluminum layer propagate from the indentation towards the fiber ply direction, whereas the failure region in the surface CFRP layer exhibits brittle fracture along the fiber orientation. In terms of load-carrying capacity, the Al-CF laminate configuration exhibits the best performance, followed by the CF-Al-CF configuration. Compared with the pure CFRP panel honeycomb sandwich structure, the limit loads of these two laminate configurations were increased by 22.18% and 5.18%, respectively. Regarding energy absorption, when the panel remains intact, the FML panel honeycomb sandwich structure absorbs more energy than the CFRP panel honeycomb sandwich structure. When the panel undergoes penetration failure, the energy required for failure in the Al-CF, Al-CF-Al, and CF-Al-CF laminate structures is 33.6%, 19.6%, and 22.10% higher than that of the CFRP panel, respectively.

     

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