Run Chen , Qixin Zhao , Mengjia Li , Sisi Wang , Yuan Zhao , Xiping Li , Shiju E , Linlin Wang
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引用次数: 0
摘要
本文研究了采用熔融长丝制造（FFF）技术制造的、用不锈钢 Z 形销加固的混合金属复合材料单搭接接头（SLJ）的界面剪切强度。接头是通过使用 FFF 将直径为 2 毫米的正交阵列钢 Z 形销三维打印到钢基板上制成的。然后使用超声辅助 Z-Fibre™（UAZ）方法将 Z 形销嵌入玄武岩纤维（BF）-织物/环氧树脂复合材料中，以形成高强度和坚韧的界面。结果表明，通过 FFF 生产的钢 Z 针能有效提高混合金属复合材料 SLJ 的剪切强度，显著改善接头性能。研究还探讨了 Z 销的体积分数和嵌入高度对 SLJ 剪切强度的影响。研究发现，Z 销的体积分数越高、嵌入高度越大，剪切强度就越高。与未加固的接头相比，钢 Z 形销加固接头的最大剪切强度提高了 120.1%。这种提高归功于有效的能量吸收机制，主要是由 Z 形销的摩擦拉出、塑性变形和剪切断裂以及韧性凹痕的形成所促进的。这些机制可抑制裂纹扩展，提高连接完整性。本研究提出了一种制造具有更高韧性和强度的混合金属复合材料接头的创新方法。
Enhancing shear strength in hybrid metal-composite single-lap joints using Z-pins fabricated via fused filament fabrication
This paper investigates the interfacial shear strength of hybrid metal-composite single-lap joints (SLJs) reinforced with stainless steel Z-pins fabricated by fused filament fabrication (FFF). The joints were created by 3D printing an orthogonal array of 2 mm diameter steel Z-pins onto a steel substrate using FFF. The Z-pins were then embedded into a basalt fibre (BF)-fabric/epoxy resin composite using the Ultrasonically Assisted Z-Fibre™ (UAZ) method to form a high-strength and tough interface. The results demonstrate that steel Z-pins produced via FFF effectively enhance the shear strength of the hybrid metal-composite SLJs, significantly improving joint performance. The study also explores the influence of Z-pin volume fraction and embedding height on SLJ shear strength. It was found that higher volume fractions and greater embedding heights of the Z-pins contribute to the increased shear strength. Compared to unreinforced joints, the maximum shear strength of the steel Z-pin reinforced joints increased by 120.1 %. This enhancement is attributed to the effective energy absorption mechanisms, primarily facilitated by the frictional pull-out, plastic deformation and shear fracture of Z-pins accompanied by the formation of ductile dimples. These mechanisms suppress crack propagation and improve joint integrity. This study presents an innovative approach for fabricating hybrid metal-composite joints with enhanced toughness and strength.
期刊介绍：
Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses.
Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering.
The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.
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