Abstract This paper presents a study on thermoplastic single-lap double rivet joints (SLDJ) with and without adhesive subjected to out-of-plane projectile impact and quasi-static concentrated loading. The three-dimensional finite element (FE) models considering strain-rate effects and damage evolution were developed and implemented in the commercial code Abaqus/Explicit through a user-defined subroutine VUMAT. The FE models were validated against the experimental results, in terms of the peak load, the maximum displacement and the dissipated energy. It was found that there were three stages in the load-displacement trace up to the failure, i.e. rivet slip, hole failure and laminate break for the rivet joint, and debonding, rivet slip and laminate break for the rivet joint with adhesive. The rivet joint with adhesive has a higher stiffness before debonding occurs; however, its out-of-plane load carrying capacity is slightly lower than the rivet only counterpart. The validated models were used to study the failure mechanisms of SLDJ through the progressive failure simulation, and further to investigate the effects of boundary conditions, ply angle and impact energy on the impact response of the composite joints. The laminates with 45° ply could be used to enhance the impact resistance of composite joint structures with the reduced damaged area.

中文翻译：

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平面外载荷作用下热塑性复合材料接头的结构响应

摘要 本文研究了带和不带粘合剂的热塑性单搭双铆钉接头（SLDJ）在面外弹丸冲击和准静态集中载荷下的研究。考虑应变率效应和损伤演化的三维有限元 (FE) 模型是通过用户定义的子程序 VUMAT 在商业代码 Abaqus/Explicit 中开发和实现的。有限元模型根据实验结果在峰值载荷、最大位移和耗散能量方面进行了验证。研究发现，载荷-位移轨迹直至失效为止存在三个阶段，即铆钉接头的铆钉滑移、孔洞破坏和层压断裂，以及有粘合剂的铆钉接头的脱粘、铆钉滑移和层压断裂。带粘合剂的铆钉接头在脱粘前具有更高的刚度；然而，它的平面外承载能力略低于铆钉对应物。验证模型用于通过渐进式失效模拟研究 SLDJ 的失效机制，并进一步研究边界条件、层板角度和冲击能量对复合材料接头冲击响应的影响。具有 45° 层的层压板可用于增强复合材料接头结构的抗冲击性，并减少损坏面积。层角和冲击能量对复合材料接头冲击响应的影响。具有 45° 层的层压板可用于增强复合材料接头结构的抗冲击性，并减少损坏面积。层角和冲击能量对复合材料接头冲击响应的影响。具有 45° 层的层压板可用于增强复合材料接头结构的抗冲击性，并减少损坏面积。