钛合金薄板自冲铆接工艺及失效行为研究

doi:10.3901/JME.2018.13.202

机械工程学报 ›› 2018, Vol. 54 ›› Issue (13): 202-207.doi: 10.3901/JME.2018.13.202

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钛合金薄板自冲铆接工艺及失效行为研究

张先炼, 何晓聪, 赵伦, 邢保英

昆明理工大学创新制造技术研究所昆明 650500

收稿日期:2017-08-11 修回日期:2018-02-19 出版日期:2018-07-05 发布日期:2018-07-05
通讯作者: 何晓聪(通信作者),男,1955年出生,博士,教授,博士研究生导师。主要研究方向为新轻型板材连接新技术,机械系统绿色设计制造。E-mail:xiaocong_he@126.com
作者简介:张先炼,男,1992年出生。主要研究方向为薄板材料连接新技术。E-mail:zxlian4gd@163.com
基金资助:
国家自然科学基金（51565023，51565022）和国家留学基金委（201500090194）资助项目。

Process and Failure Behaviors of Self-piercing Riveting in Titanium Alloy Sheets

ZHANG Xianlian, HE Xiaocong, ZHAO Lun, XING Baoying

Innovative Manufacturing Research Centre, Kunming University of Science and Technology, Kunming 650500

Received:2017-08-11 Revised:2018-02-19 Online:2018-07-05 Published:2018-07-05

摘要/Abstract

摘要： 基于自冲铆接（SPR）技术，从降低板材硬度和提高铆钉硬度两个角度，实现了对TA1钛合金薄板的有效连接，并制备了TH（降低板材硬度）和TR（提高铆钉硬度）两组钛合金自冲铆接头。通过力学试验研究了两组接头的静力学和疲劳性能，并且基于三参数经验公式采用S-N曲线拟合法绘制出接头S-N曲线。最后，从宏观角度分析两组接头的失效行为，并利用高真空扫描电镜（SEM）进行TR接头的微观断口分析。结果表明：从自冲铆接技术优势和工程实际角度考虑，TR接头的铆接方式比TH接头更具实际操作意义。TH接头的静失效载荷和能量吸收性能均优于TR接头；且两组接头的静力学失效形式均为铆钉断裂。而TR接头疲劳性能更优，且两组接头均出现了下板断裂和铆钉断裂的多种疲劳失效形式。此外，依据SEM观测结果推断出因下板断裂而失效的TR接头，其疲劳裂纹源于铆钉脚应力集中点，且首先沿板宽方向扩展，后沿板厚方向延伸，直至接头完全断裂失效。而因铆钉断裂而失效的TR接头，其断口呈现出典型的疲劳脆性断裂特征。

关键词: TA1钛合金, 断口分析, 工艺研究, 失效行为, 自冲铆接

Abstract: Based on self-piercing riveting (SPR) technology, the effective connection for TA1 titanium alloy sheets is realized. And TH and TR joints are fabricated with reducing the sheet hardness and raising the rivet hardness, respectively. The static and fatigue performances are studied, and the S-N curves are fitted using the S-N curve fitting method. Finally, the failure behaviors of the joints are analyzed in a macro perspective, and the micro fracture analysis for TR joints is conducted with a scanning electron microscope (SEM). The results showed that:TR joints are more practical than TH joints. The peak load and energy absorption value of TH joints are superior to those of TR joints, and their static failure modes are all rivet fracture. TR joints had a better fatigue performance than TH joints, they both failed because of locked sheet fracture or rivet fracture. Furthermore, it can be referred that the fatigue cracks of TR joints, which failed due to locked sheet fracture, initiated at the stress concentration point of the rivet feet, and extended along the sheet width direction first, and then along the thickness direction of the plate until the joints are completely broken. And the rivet fracture surfaces of TR joints are the typical fatigue brittle fracture characteristics.

Key words: failure behavior, fracture analysis, process research, self-piercing riveting, TA1 titanium alloy

中图分类号:

TG316

张先炼, 何晓聪, 赵伦, 邢保英. 钛合金薄板自冲铆接工艺及失效行为研究[J]. 机械工程学报, 2018, 54(13): 202-207.

ZHANG Xianlian, HE Xiaocong, ZHAO Lun, XING Baoying. Process and Failure Behaviors of Self-piercing Riveting in Titanium Alloy Sheets[J]. Journal of Mechanical Engineering, 2018, 54(13): 202-207.

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钛合金薄板自冲铆接工艺及失效行为研究

Process and Failure Behaviors of Self-piercing Riveting in Titanium Alloy Sheets

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