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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第6期    总第196期    2010年12月

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文章编号:1672-7207(2010)06-2213-05
切割对铝合金厚板残余应力分布影响的仿真与分析
闫鹏飞,吴运新,廖凯

(中南大学 机电工程学院,湖南 长沙,410083)

摘 要: 使用有限单元法对切割加工过程对于铝合金厚板残余应力分布造成的影响进行研究,利用大型商用非线性有限元软件MSC.Marc提供的单元生死技术建立7075铝合金厚板切割的有限元模型,对切割前、后铝合金厚板内应力的变化进行模拟,并进行实验验证。仿真和实验结果表明:切割产生的边缘处由于失去原有相邻的材料对其的拉伸或压缩作用,应力减小,应力变化随着与边缘距离的增加而减小;与边缘的距离超过板材厚度的部分应力变化很小,可以忽略;切割对表面应力的影响较大、对芯部应力影响较小;对与其方向垂直的应力影响较大,对与其方向平行的应力影响较小。

 

关键字: 铝合金;厚板;应力场;切割加工;有限元仿真

Simulation and analysis of effect of cutting machining on residual stress distribution in thick aluminum alloy plate
YAN Peng-fei, WU Yun-xin, LIAO Kai

School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Abstract:Finite element method was used to study the variation of residual stress distribution in thick aluminum plate. The finite element model was achieved by virtue of non-linear software MSC marc, in which the birth-death element is available. The variation of residual stress in thick aluminum alloy plate before and after cutting was simulated and several experiments were done to verify the results of the simulation. The results show that the residual stress on the boundary formed by the cutting decrease is caused by losing the adjacent material; the variation value decreases as the distance to the boundary increases; as the value of distance is greater than the thickness, the variation value is very small, even can be ignored; cutting has greater influence on the surface stress than core stress and has greater influence on the stress that is vertical to its direction than the one that is parallel to it.

 

Key words: aluminum alloy; thick plate; stress field; cutting machining; finite element simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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