铝合金焊接接头预腐蚀强度特性及预测

doi:10.7527/S1000-6893.2013.0064

固体力学与飞行器总体设计

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铝合金焊接接头预腐蚀强度特性及预测

张俊苗¹, 聂宏¹, 薛彩军¹, 吴会强², 鄢东洋²

1. 南京航空航天大学机械结构力学及控制国家重点实验室, 江苏南京 210016;
2. 北京宇航系统工程研究所, 北京 100076

收稿日期:2012-10-19 修回日期:2013-01-04 出版日期:2013-09-25 发布日期:2013-01-17
通讯作者: 聂宏,Tel.:025-84892411 E-mail:hnie@nuaa.edu.cn E-mail:hnie@nuaa.edu.cn
作者简介:张俊苗男, 博士研究生。主要研究方向: 机械结构疲劳寿命预测技术。Tel: 025-84892384 E-mail: zjmin2001@hotmail.com;聂宏男, 博士, 教授, 博士生导师。主要研究方向: 结构疲劳寿命预测。Tel: 025-84892411 E-mail: hnie@nuaa.edu.cn;薛彩军男, 博士, 副教授, 硕士生导师。主要研究方向: 飞机结构强度。Tel: 025-84892384 E-mail: cjxue@nuaa.edu.cn;吴会强男, 博士, 高级工程师。主要研究方向: 航天器推进剂贮箱结构的研究与设计。Tel: 010-68381963 E-mail: wuhq888@sina.com;鄢东洋男, 博士, 工程师。主要研究方向: 航天器推进剂贮箱结构的研究与设计。Tel: 010-68381963 E-mail: bryan168.yan@gmail.com
基金资助:
江苏省自然科学基金(BK2012795)

Properties and Prediction of Pre-corrosion Strength of Aluminum Alloy Welded Joints

ZHANG Junmiao¹, NIE Hong¹, XUE Caijun¹, WU Huiqiang², YAN Dongyang²

1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China

Received:2012-10-19 Revised:2013-01-04 Online:2013-09-25 Published:2013-01-17
Supported by:
Natural Science Foundation of Jiangsu Province (BK2012795)

摘要/Abstract

摘要：

为保证航空航天器中贮存腐蚀溶液的焊接结构的耐久性,有必要对焊接接头预腐蚀强度特性进行研究。首先进行2219-T87铝合金焊接接头试样在酸性模拟溶液中的腐蚀试验,获取焊接接头和母材的腐蚀性能数据;根据腐蚀试验数据,结合焊接接头局部力学试验数据,采用有限元方法对焊接接头预腐蚀强度和断裂位置进行预测;通过焊接接头预腐蚀拉伸试验对预测结果进行验证。研究结果表明:焊接接头腐蚀性能最主要的特点是焊缝区、热影响区和母材的腐蚀性能存在显著差异;腐蚀性能是影响焊接接头预腐蚀强度的重要因素,且其影响随着腐蚀时间的增加而逐渐增大,导致长时间腐蚀的试样在拉伸试验中的断裂位置由力学性能薄弱的熔合区转移到腐蚀性能薄弱的母材区;所提出的预测方法具有试验规模小、结果准确且适应性强的优点。

关键词: 焊接接头, 铝合金, 腐蚀, 有限元法, 耐腐蚀性能

Abstract:

In order to ensure the durability of welded structures used for long-term storage of corrosive solutions in the aerospace field, it is necessary to study the pre-corrosion strength properties of welded joints. Corrosion tests of welded joint specimens AA2219-T87 are conducted in an acid solution to obtain the corrosion property data of the welded joints and base metal, and the differences of corrosion properties between the welded joint and base metal are summarized. Based on the data of corrosion tests and welded joint local strength tests, a finite element method is used to predict the pre-corrosion strength and fracture position of welded joints, the results of which are verified by pre-corrosion tensile tests. The study shows that the major characteristic of a welded joint's corrosion resistance is the existence of obvious differences of corrosive resistance among the weld zone, the heat affected zone and the base metal. The corrosion resistance is an important factor for the pre-corrosion strength of welded joints, and its influence increases with time, leading to the translocation of fracture positions of long-time corroded specimens from areas of poor mechanical property to areas of poor corrosion property during tensile tests. The proposed prediction method of welded joint pre-corrosion strength can yield accurate results with a minimum number and scale of tests.

Key words: welded joints, aluminum alloy, corrosion, finite element method, corrosion resistance

中图分类号:

V416.5

张俊苗, 聂宏, 薛彩军, 吴会强, 鄢东洋. 铝合金焊接接头预腐蚀强度特性及预测[J]. 航空学报, 2013, 34(9): 2161-2168.

ZHANG Junmiao, NIE Hong, XUE Caijun, WU Huiqiang, YAN Dongyang. Properties and Prediction of Pre-corrosion Strength of Aluminum Alloy Welded Joints[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(9): 2161-2168.

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E-mail：hkxb@buaa.edu.cn

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铝合金焊接接头预腐蚀强度特性及预测

Properties and Prediction of Pre-corrosion Strength of Aluminum Alloy Welded Joints

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