锻压技术

铆钉高度对树脂基复合材料与铝合金自冲铆接接头抗拉强度的影响及失效分析

英文标题：Influence of rivet height on tensile strength of self-piercing riveted joint between resin matrix composite material and aluminum alloy and failure analysis

作者：黄志超罗健汪伟

单位：华东交通大学材料科学与工程学院

关键词：树脂基复合材料铝合金自冲铆接抗拉强度失效模式

分类号：TG938

出版年,卷(期):页码：2021,46(5):77-83

摘要：

为探究铆钉高度对碳/玻璃纤维树脂基复合材料(CFRP/GFRP)与AA5754铝合金自冲铆接接头抗拉强度的影响，采用铆钉高度分别为7、8和9 mm的AA5754铝合金自冲铆接接头进行拉伸-剪切试验，观察其成形截面和失效模式。结果表明：铆钉高度越高，AA5754铝合金自冲铆接接头的成形截面越好；铆钉高度会对CFRPAA5754和GFRPAA5754铆接接头的初始刚度产生影响。铆钉高度相同时，GFRPAA5754铆接接头的最大静载荷比CFRPAA5754铆接接头的最大静载荷高约25%，两者的能量吸收值差距不大；铆接材料相同时，铆钉高度越大，接头最大载荷均值和能量吸收能力均变大。CFRPAA5754铆接接头的失效模式为复合材料板与铆钉分离，伴随着上板材料纤维丝的断裂和层间开裂；GFRP-5754铆接接头的失效模式为金属板与铆钉分离。

In order to explore the influence of rivet height on the tensile strength of self-piercing riveted joint between carbon/glass fiber resin matrix composite materials (CFRP/GFRP) and AA5754 aluminum alloy, the tensile-shear tests were conducted on AA5754 aluminum alloy self-piercing riveted joint with the rivet height of 7, 8 and 9 mm respectively, and the formed cross section and failure mode were observed. The results show that the higher the rivet height is, the better the formed cross section of AA5754 aluminum alloy self-piercing riveted joint is. The rivet height affects the initial stiffness of CFRP-AA5754 and GFRP-AA5754 riveted joints. When the rivet height is the same, the maximum static load of GFRP-AA5754 riveted joint is about 25% higher than that of CFRP-AA5754 riveted joint, but their difference in energy absorption is small. Furthermore, when the rivet material is the same, the greater the rivet height is, the greater the maximum load mean and the energy absorption capacity of joint are. However, the failure modes of CFRP-AA5754 riveted joint are the separation of composite material plate from the rivet, the fracture of upper plate material filament and the interlaminar cracking, and the failure mode of GFRP-AA5754 riveted joint is the separation of metal plate and rivet.

基金项目：

国家自然科学基金资助项目（51875201）

黄志超(1971-)，男，博士，教授 E-mail：hzcosu@163.com

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