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碳纤维增强复合材料（CFRP）铆接搭接接头的静态和疲劳强度及失效机制

Static and Fatigue Strength and Failure Mechanisms of Riveted Lap Joints of CFRP Composites.

作者信息

Godzimirski Jan, Rośkowicz Marek, Jasztal Michał, Barca Iga

机构信息

Faculty of Mechatronics, Armament and Aerospace, Military University of Technology, 00-908 Warsaw, Poland.

出版信息

Materials (Basel). 2023 Feb 21;16(5):1768. doi: 10.3390/ma16051768.

DOI:10.3390/ma16051768
PMID:36902891
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10004697/
Abstract

The background of this work is the search for the most effective ways of joining composites, inter alia in aeronautical applications. The purpose of this study was to analyze the impact of mechanical fastener types on the static strength of lap joints of composite elements and the impact of fasteners on the mechanism of failure of such joints under fatigue load. The second objective was to check to what extent the hybridization of such joints, consisting of supplementing them with an adhesive joint, affects their strength and the mechanism of failure of such joints loaded with fatigue. Damage to composite joints was observed using computed tomography technology. The fasteners used in this study (aluminum rivets, Hi-lok and Jo-Bolt) differed not only in terms of the materials they were made of, but also in terms of the pressure forces they exerted on the joined parts. Finally, in order to check how a partially cracked adhesive joint affects the load on the fasteners, numerical calculations were carried out. Analyzing the results of the research, it was found that partial damage to the adhesive joint of the hybrid joint does not increase the load on the rivets and does not impair the fatigue life of the joint. An important advantage of hybrid joint is the two-stage destruction of the connection, which significantly increases the safety of aircraft structures and facilitates the process of supervising their technical condition.

摘要

这项工作的背景是寻找复合材料连接的最有效方法，尤其是在航空应用领域。本研究的目的是分析机械紧固件类型对复合材料元件搭接接头静态强度的影响，以及紧固件对这种接头在疲劳载荷下失效机制的影响。第二个目标是检验由胶粘剂接头补充的这种接头的杂交对接头强度以及这种承受疲劳载荷的接头失效机制的影响程度。使用计算机断层扫描技术观察复合材料接头的损伤情况。本研究中使用的紧固件（铝铆钉、Hi-lok和Jo-Bolt）不仅在制造材料方面不同，而且在它们对连接部件施加的压力方面也不同。最后，为了检验部分开裂的胶粘剂接头如何影响紧固件上的载荷，进行了数值计算。通过分析研究结果发现，混合接头胶粘剂接头部分损坏不会增加铆钉上的载荷，也不会损害接头的疲劳寿命。混合接头的一个重要优点是连接的两阶段破坏，这显著提高了飞机结构的安全性，并便于监督其技术状况的过程。

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