中国机械工程

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2A12航空铝合金多轴疲劳试验及应力准则寿命预测模型研究

陈亚军1;刘波2;刘辰辰1;周剑1   

  1. 1.中国民航大学中欧航空工程师学院,天津,300300
    2.中国南方航空股份有限公司,广州,510410
  • 出版日期:2017-05-10 发布日期:2017-05-04
  • 基金资助:
    国家自然科学基金资助项目(11502285);
    中央高校基本科研业务费专项资金资助项目(3122016U003)

Multiaxial Fatigue Test of Aeronautical Aluminum Alloy 2A12 and Research on Stress Criterion Life Predictive Model

CHEN Yajun1;LIU Bo2;LIU Chenchen1;ZHOU Jian1   

  1. 1.Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin,300300
    2.China Southern Airlines Company Limited,Guangzhou,510410
  • Online:2017-05-10 Published:2017-05-04

摘要: 针对多轴疲劳失效问题,选取2A12航空铝合金进行应力幅比变量、相位差变量和平均应力变量的多轴疲劳试验。对常用的3种多轴疲劳应力准则寿命预测模型(即Lee准则、Carpinteri准则和Sines准则)进行讨论,并通过引入应力幅比参量和相位差参量,提出基于Carpinteri准则的修正模型。将不同条件下2A12航空铝合金的试验寿命与不同应力准则下模型的预测寿命进行比较,结果表明:Lee准则对上述多轴疲劳试验的预测结果过于危险;Carpinteri准则和Sines准则由于未考虑拉-扭应力幅比和相位差因素,预测寿命与实际寿命相比均出现了较大偏差;修正后的应力准则寿命预测模型在不同条件下90%的寿命预测数据在两倍误差带内。

关键词: 2A12铝合金, 多轴疲劳, 应力准则, 寿命预测, 模型修正

Abstract: Based on multiaxial fatigue failures, compound fatigue tests of stress-amplitude ratio, tension-torsion phase and average stress variables were carried out on 2A12 aluminum alloy. With the discussions of 3 common multiaxial fatigue life predictive models of stress criterion which included Lee criterion, Carpinteri criterion and Sines criterion, a modified model was built on the basis of Carpinteri criterion considering effects of both stress-amplitude ratio and tension-torsion phase. The comparison between predicted life and experimental life under different conditions shows that Lee criterion's predictive results are too over-estimated for the above experiments. Without consideration of stress-amplitude ratio and tension-torsion phase, the predicted life of Carpinteri criterion and Sines criterion have large errors compared with the experimental life. The new modified stress criterion life predictive model may give results that 90 percent of life prediction data will be in the 2 times error band with different conditions.

Key words: 2A12 aluminum alloy, multiaxial fatigue, stress criterion, life prediction, model modification

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