中国机械工程 ›› 2016, Vol. 27 ›› Issue (04): 537-543.

• 机械基础工程 • 上一篇    下一篇

7075T651铝合金板材内部初始残余应力分布研究  

刘良宝1,2;孙剑飞1,2;陈五一1,2;陈清良3   

  1. 1.北京航空航天大学, 北京, 100191
    2.先进航空发动机协同创新中心, 北京, 100191
    3.成都飞机工业(集团)有限责任公司, 成都, 610092
  • 出版日期:2016-02-25 发布日期:2016-03-03
  • 基金资助:
    国家科技重大专项(2014ZX04001011); 中央高校基本科研业务费专项资金资助项目 

Study on Distribution of Initial Residual Stress in 7075T651 Aluminium Alloy Plate

Liu Liangbao1,2;Sun Jianfei1,2;Chen Wuyi1,2;Chen Qingliang3   

  1. 1.Beihang University, Beijing,100191
    2.Collaborative Innovation Center of Advanced Aero-engine, Beijing,100191
    3.Chengdu Aircraft Industry (Group) Co., Ltd., Chengdu,610092
  • Online:2016-02-25 Published:2016-03-03
  • Supported by:
     

摘要:

针对材料内部残余应力分布的传统剥层测量方法,对底部贴片的剥层法进行改进,通过测量底部释放的应变,结合有限元方法模拟残余应力释放过程中得到的各剥除层的应变释放系数,计算出了剥除层释放的残余应力。运用弹性力学理论推导得到了材料内部初始残余应力的修正公式。随后基于两种方法对典型7075T651航空铝合金预拉伸板的内部残余应力进行了测量,并对测量结果进行了分析和比较。结果表明,改进法能够有效评估材料内部初始残余应力分布规律,但是在个别深度处测量精度有待进一步提高。

关键词: 铝合金预拉伸板, 7075T651铝合金, 初始残余应力, 有限元法, 改进剥层法

Abstract:

A modified layer-removal method was proposed to measure the profile of residual stress within the material by analyzing the characteristics of a traditional layer-removal method. The proposed approach estimated residual stress fields by the combination of measuring strains on the bottom of specimen and the coefficients of strain release using the finite element method (FEM) simulation. The initial residual stress was then deduced by revising the measured stress based on the elasticity theory. Furthermore, the residual stress in a 7075T651  aluminium alloy plate was measured using the proposed method, and the results were then analyzed and compared with the data obtained by the traditional methods. The analyses indicate that the modified layer-removal method is effective and practical for measuring the residual stress distribution in pre-stretched aluminium alloy plates.

Key words: pre-stretched aluminium alloy plate, 7075T651 aluminium alloy plate, initial residual stress, finite element method (FEM), modified layer-removal method

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