CFRP/Al抽芯铆钉单剪干涉配合的渐进损伤数值模拟研究

Numerical simulation of progressive damage of single-lap CFRP/Al connected by blind rivet under interference condition

  • 摘要: 干涉配合在改善抽芯铆钉连接复合材料的力学性能方面具有较强优势。然而,干涉配合下抽芯铆钉的安装往往会导致碳纤维增强树脂复合材料(CFRP)层压板的损坏,削弱铆接接头的力学性能。本文采用了完整的抽芯铆钉模型,基于连续损伤力学、扩展的三维破坏准则和应变率效应,通过有限元和Abaqus二次开发相结合的方法,研究了CFRP/Al单剪铆接中抽芯铆钉与连接孔的干涉量和铆钉的安装速度对复合材料损伤的影响。从模拟结果来看受安装速度的影响显著,安装阻力呈现出两个典型的阶段,分别由铝合金板、CFRP板与抽芯铆钉的摩擦产生造成。抽芯铆钉安装在干涉配合情况下,安装速度越大对于降低安装阻力十分有利。然而,过高的安装速度会导致孔壁的损伤增加,尤其在高干涉量下更明显。抽芯铆钉铆接接头的失效模式以CFRP损伤为主,并受干涉尺寸的影响显著。

     

    Abstract: Interference fit has advantages in improving the mechanical performance of blind rivet in connections for composite materials. However, the installation of blind rivets under interference fit leads to the damage of carbon fiber reinforced plastic (CFRP) laminates, weakening the mechanical performance of the joints. In this paper, based on continuous damage mechanics, extended three-dimensional failure criteria and strain rate effect, a complete blind rivet model, which combining finite element method and secondary development of Abaqus was developed to study the effect of interference and installation speed on the damage of composite materials. From the simulation results, the installation resistance force exhibits two typical stages, which are generated by the friction between the aluminum alloy and the CFRP laminate with the blind rivet, respectively. Under interference fit conditions, a higher installation speed is highly advantageous in reducing installation resistance. However, excessive installation speed can lead to increased damage to the hole walls, which is especially noticeable in cases of high interference fit. The failure mode of the joint is mainly caused by CFRP damage and is significantly influenced by the interference size.

     

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