平底无铆连接的材料流动行为及接头失效机理研究

Research on material flow in flat clinching process and joint failure mechanism

张惠阳 ¹陈超²

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作者信息

1. Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha 410083,China
2. Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha 410083,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China
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摘要

平底无铆连接在轻量化结构中具有广阔应用前景.本研究旨在分析平底无铆连接过程中的材料流动行为和接头失效机理.在不同的成形载荷下,使用平底无铆连接工艺连接Al5052-H32铝合金板材.建立了平底无铆连接有限元模型,分析其材料流动规律.通过接头的金相观察以及硬度测试得到连接过程中材料的实际流动行为.采用扫描电子显微镜对材料力学性能测试后的失效接头断口进行观察,从而研究其失效机理.结果表明,在平底无铆连接过程中,材料流动最活跃的区域集中在冲头圆角处的上板区域.在剪切试验中,接头断裂的微观形貌表现为脆性-韧性混合断裂.在拉伸试验中,观察到接头断裂的微观形貌具有韧性断裂特征.

Abstract

Flat clinched joints are gaining popularity in lightweight and innovative engineering structures.This study aims to analyze the material flow in the flat clinching process and joint failure mechanism.Al5052-H32 aluminum alloy sheets were joined using flat clinching with varying forming loads.A finite element model was developed to study the material flow.Metallographic observations and microhardness measurements of the joint cross-section were conducted to investigate the material flow.Shear tensile and cross-tension tests were performed to analyze the influence of forming load on joint mechanical behaviors.Fracture surface analysis reveals joint fracture mechanisms in the cross-tension and shear tensile tests from microscopic and macroscopic perspectives.The results show that the most active material flow occurred in the upper sheet region near the punch fillet.Joint fracture exhibited ductile characteristics caused by the aggregation of micropores.

关键词

平底无铆连接/无铆接头/材料流动/力学行为/失效机制

Key words

flat clinching/clinched joint/material flow/mechanical behaviors/failure mechanism

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基金项目

National Natural Science Foundation of China(52275398)

Innovation-Driven Research Programme of Central South University,China(2023CXQD068)

Hunan Provincial Natural Science Foundation for Excellent Young Scholars,China(2021JJ20059)

State Key Laboratory of High Performance Complex Manufacturing,Central South University,China(ZZYJKT2022-01)

Huxiang Young Talents Program of Hunan Province,China(2021RC3024)

Huxiang Highlevel Talent Gathering Project of Hunan Province,China(2021RC5001)

出版年

2023

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDCSCDEI

影响因子：0.47

ISSN：2095-2899

参考文献量27

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