GF/PP thermoplastic composite components predominantly employ metallic fasteners, leading to corrosion and weight issues. This study utilized an extrusion process to fabricate GF/PP thermoplastic composite rivets with properties akin to laminated panel materials. Through the controlled application of heat and pressure to the rivet ends, a novel connection structure was established. The article fabricated thermoplastic composite joints with varying end configurations and compared them with metallic rivet joints. Emphasizing the convex form, diverse multi-rivet links were crafted for single-lap tensile samples. Integrating tensile tests and strain gauge measurements, this research explored load distribution patterns across diverse rivet quantities and assessed the impact of size on distribution. Furthermore, finite element software was used to dissect the load distribution patterns and failure mechanisms in the multi-riveted connection structure. Drawing from experimental findings, convex GF/PP rivets exhibited an 18% higher tensile load than metallic ones, with a simultaneous 32% weight reduction. In multi-rivet connections, end rivets demonstrated higher load-bearing capacity. Enhanced spacing and plate width improved load distribution, elevating joint load capacity by 7% (spacing 25 mm to 55 mm) and 6% (width 30 mm to 55 mm). The simulation results indicate that increasing the spacing reduces the stress concentration at the first nail location.

中文翻译：

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热塑性复合材料铆钉多铆钉连接铆钉载荷分布分析与优化

GF/PP 热塑性复合材料部件主要采用金属紧固件，导致腐蚀和重量问题。本研究利用挤出工艺来制造具有类似于层压板材料性能的 GF/PP 热塑性复合铆钉。通过对铆钉端部施加受控的热量和压力，建立了一种新颖的连接结构。该文章制造了具有不同端部配置的热塑性复合材料接头，并将其与金属铆钉接头进行了比较。为了强调凸面形状，为单搭接拉伸样品制作了多种多铆钉连接件。这项研究结合拉伸测试和应变仪测量，探索了不同铆钉数量的载荷分布模式，并评估了尺寸对分布的影响。此外，使用有限元软件剖析多铆接连接结构中的载荷分布模式和失效机制。根据实验结果，凸面 GF/PP 铆钉的拉伸载荷比金属铆钉高 18%，同时重量减轻 32%。在多铆钉连接中，端部铆钉表现出更高的承载能力。增强的间距和板宽度改善了负载分布，将接头负载能力提高了 7%（间距 25 毫米至 55 毫米）和 6%（宽度 30 毫米至 55 毫米）。模拟结果表明，增加间距可以减少第一个钉子位置处的应力集中。