航空学报 > 2008, Vol. 29 Issue (4): 1073-1078

2A12铝合金试件中空间斜裂纹在线止裂及性能分析

付宇明1,吴杰2,康玮明1,何大川1   

  1. 1.燕山大学 机械工程学院 2.燕山大学 电气工程学院
  • 收稿日期:2007-11-24 修回日期:2008-04-28 出版日期:2008-07-10 发布日期:2008-07-10
  • 通讯作者: 付宇明1

On-line Crack Prevention and Performance Analysis of Aluminum Alloy 2A12 Specimen with Oblique Crack

Fu Yuming1, Wu Jie2, Kang Weiming1, He Dachuan1   

  1. 1.College of Mechanical Engineering, Yanshan University 2.College of Electrical Engineering, Yanshan University
  • Received:2007-11-24 Revised:2008-04-28 Online:2008-07-10 Published:2008-07-10
  • Contact:

    Fu Yuming1

摘要:

选择带有空间斜裂纹的2A12铝合金试件进行了拉伸载荷作用下电磁热在线止裂研究。采用数值分析方法确定了止裂工艺参数,并求得了放电后试件内的温度场及热应力场;通过自制加载装置,应用ZL-2超强脉冲电流放电装置完成了空间裂纹在线止裂试验;对止裂前后的铝合金试件进行了微观组织分析和宏观力学性能测试。研究表明:脉冲放电瞬时,裂纹尖端熔化、钝化,并形成了高压应力区,提高了裂纹的扩展功,在一定的拉伸载荷下,试件也不会开裂,达到了裂纹在线止裂的目的。

关键词: 电磁热效应, 空间裂纹, 止裂, 微观组织, 力学性能

Abstract:

A study of crack prevention under tensile load is performed on an aluminum alloy 2A12 specimen with an oblique spatial crack by using electromagnetic heating online. Crack preventing technical parameters are determined by numerical analysis,and the temperature field and thermal stress field are obtained after discharge. By using a selfprepared homemade loading device and the super pulse current generating equipment of ZL-2, the spatial crack preventing experiment is carried out by electromagnetic heating online. Microstructure analysis and macroscopical mechanical property test are performed on the aluminum alloy specimen pre and post prevention. Results show that at the time of pulse current discharging, the crack tip melts, dulls and forms a compressed stress area, which increases the propagation work of the crack. The crack will not propagate even with a certain amount of tensile load; thus the formation of the main crack source will be prevented.

Key words: electromagnetic , heating,  , spatial , crack,  , crack , preventing,  , microstructure,  , mechanical , property

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