【作者】 闻向阳；

【导师】 田坚；

【作者基本信息】 长春理工大学 ， 材料加工工程， 2011， 硕士

【摘要】 A7N01铝合金具有优良的力学性能和焊接成形性能,在高速轨道列车的底架设计中得到广泛应用。本文针对国产A7N01铝合金焊接接头展开研究,主要研究A7N01铝合金焊接接头的组织及力学性能。试验所用焊接接头的坡口形式有对接V形、对接单边V形和对接K形三种,从以下几个方面对其进行试验研究：首先对三种焊接接头进行金相试件的制作,之后对其进行组织的宏观分析、微观分析和硬度分析。其次对三种焊接接头及母材进行静力学拉伸试验和冲击试验。最后对三种焊接接头进行疲劳试验及数据分析,对疲劳强度较低的焊接接头进行优化设计。通过对以上几个方面的试验数据分析,获得每种坡口形式焊接接头的各项力学性能及其影响因素。在有限元分析的基础上,对疲劳强度较低的试验件进行不同方法的优化设计,分析对比优化设计前后的试验结果,从而得出不同的优化设计方法对试验件疲劳强度提高的幅度。更多还原

【Abstract】 A7N01 aluminum alloy is with excellent mechanical properties and formability, it is widely used in the chassis of high-speed rail trains. A study of A7N01 aluminum welded joints was researched in this article, the micro structure and mechanical properties of A7N01 aluminum alloy welded joints were mainly researched. In this paper, three welded joints:V-shaped, V-shaped side and K-shaped were researched mainly from following aspects:First, make metallographic samples of the three welded joints, then take the macro analysis, micro analysis and hardness analysis of them.Second, carry out the static tensile test and the impact test of the three welded joints and the body.Finally, carry out the fatigue test of the three welded joints and analysis the data, then optimize the design to the welded joints which were weak in fatigue strength.By analysis the data of the above tests, obtained the mechanical properties of each kind of groove of welded joints, and also the factors that influence the mechanical properties can be analyzed. Based on the finite element method, the lower fatigue strength welded joints were optimized by different methods. Then the experiment results were analyzed before and after optimization. Finally the fatigue property of welding joints in different ways of optimization can be obtained.更多还原