• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2015, Vol. 51 ›› Issue (20): 120-127.doi: 10.3901/JME.2015.20.120

• 材料科学与工程 • 上一篇    下一篇

基于损伤力学-临界面法预估多轴疲劳寿命

刘俭辉1,王生楠1,黄新春2,傅益战3   

  1. 1.西北工业大学航空学院 西安 710072;
    2.西北工业大学机电学院 西安 710072;
    3.中航飞机股份有限公司汉中飞机分公司 汉中 723000
  • 出版日期:2015-10-15 发布日期:2015-10-15
  • 基金资助:
    航空科学基金资助项目(2012ZE53046)

Multiaxial Fatigue Life Prediction Based on Damage Mechanics and Critical Plane Method

LIU Jianhui1, WANG Shengnan1, HUANG Xinchun2, FU Yizhan3   

  1. 1.School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072;
    2.School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072;
    Hanzhong Branch, AVIC Xi’an Aircraft Industry(Group) Co., Ltd., Hanzhong 723000
  • Online:2015-10-15 Published:2015-10-15

摘要: 基于损伤力学理论建立的非线性疲劳寿命预估模型在多轴疲劳寿命预估中获得了广泛的应用,但该模型并未考虑损伤面发生的位置及其物理意义,将其与临界面法相结合提出一种新的多轴非线性疲劳寿命预估模型,新模型能够弥补现有的非线性疲劳寿命预估模型未考虑临界面物理意义的不足。新模型从损伤的角度来预估多轴疲劳寿命,不仅考虑了临界面上裂纹形成及扩展的物理意义、相位差对附加强化现象的影响,而且对非对称加载下的平均应变进行修正。新模型仅仅利用单轴疲劳试验数据以及单轴疲劳材料常数就可以预估出试样的多轴疲劳寿命,从而避免了代价高昂的多轴疲劳试验。采用45钢、316不锈钢、钛合金TC4三种材料的多轴疲劳试验数据对提出的模型进行评估和验证,对几种材料比例/非比例以及对称/非对称加载下的多轴疲劳寿命进行预估,预估结果与试验结果的误差都在5%以内,结果表明提出的多轴非线性疲劳寿命预估模型具有较高的预估精度。

关键词: 多轴疲劳, 非线性疲劳寿命预估模型, 临界面法, 损伤力学

Abstract: The established nonlinear fatigue life prediction model based on the theory of damage mechanics has been widely applied to multiaxial fatigue life prediction. However, this model does not take into account the location of damage and its physical significance. A new multiaxial nonlinear fatigue life prediction model is put forward based on damage mechanics and critical plane method. The new model can make up the shortage of the existing nonlinear fatigue life prediction model, which did not consider the significance of critical plane. The new model predicts multiaxial fatigue life from the perspective of damage. It not only considers the physical significance of crack formation and propagation and the influence of the phase delay on additional strengthening phenomenon, but also revises the mean strain under asymmetrical loading. The new model can predict the multiaxial fatigue life only using the uniaxial fatigue test data and uniaxial fatigue material constants, which avoids the costly multiaxial fatigue test. The new model is evaluated by the multiaxial fatigue test data of 45 steel, 316 stainless steel and titanium alloy TC4. The multiaxial fatigue life prediction results of these materials under proportional/non-proportional loading and symmetrical /asymmetrical loading are almost within a factor of five scatter band of the test result. The result shows the new multiaxial fatigue life model has high prediction accuracy.

Key words: critical plane method, damage mechanics, multiaxial fatigue, nonlinear fatigue life prediction model

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