On failure mechanisms in CFRP/Al adhesive joints after hygrothermal aging degradation following by mechanical tests
On failure mechanisms in CFRP/Al adhesive joints after hygrothermal aging degradation following by mechanical tests
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DOI：
10.1016/j.tws.2020.107184
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发表时间：
2021
影响因子：
6.4
通讯作者：
G. Zheng;Zongkai He;K. Wang;Xinglong Liu;Quantian Luo;Qing Li;Guangyong Sun
中科院分区：
文献类型：
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作者：
G. Zheng;Zongkai He;K. Wang;Xinglong Liu;Quantian Luo;Qing Li;Guangyong Sun
粘接技术在汽车工业中得到了广泛的应用和研究，使得碳纤维增强塑料(CFRP)复合材料和金属等不同材料的粘接成为可能。然而，由于所涉及的聚合物材料的性质，在车辆恶劣的使用条件下，粘接接头的耐久性往往是一个主要问题。本研究旨在探讨碳纤维复合材料/铝胶接接头在湿热降解后的失效机理。除力学强度外，本文还研究了时效节点的破坏过程和破坏模式。结果表明，胶接接头的强度在湿热降解后有所下降，但在老化40d后有显着提高。老化20天后的失效过程与未老化的不同。根据剩余强度和破坏过程的变化，破坏模式总体上表现为三种不同的类型，并识别出两种罕见的破坏模式。结果表明，胶粘剂材料的残余力学性能是水塑化和固化温度共同作用的结果。发现其吸湿特性与其残余力学性能有关。这项研究有望对湿热对CFRP/Al胶接接头残余性能的影响有一定的了解。
Adhesive bonding techniques have been widely used and studied in automobile industry, enabling to join dissimilar materials, such as carbon fiber reinforced plastic (CFRP) composites and metals. However, durability of an adhesive joint is often a major concern in the severe service conditions of vehicle due to the nature of polymeric materials involved. This study aims to investigate the failure mechanisms of CFRP/Aluminum adhesive joints after certain hygrothermal degradation. In addition to mechanical strengths, the failure process and failure modes of the aged joints were studied herein. The results divulged that the strengths of adhesive joints decreased after hygrothermal degradation but had a noticeable increase after 40 days of aging. The failure process after 20 day aging was different from that without aging. In terms of variations in residual strengths and failure process, the failure modes exhibited three different types overall and two uncommon failure modes were identified. It is shown that the residual mechanical properties of adhesive material were a result of the combined effects of water plasticization and temperature post-curing. Its moisture absorption characteristics is found to be related to its residual mechanical properties. The study is anticipated to gain some insights into the hygrothermal effects on the residual properties of the CFRP/Al adhesive joint.