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考虑初始损伤的脆性疲劳损伤模型及验证

孙杰 李敏 孙宾

孙杰, 李敏, 孙宾等 . 考虑初始损伤的脆性疲劳损伤模型及验证[J]. 北京航空航天大学学报, 2017, 43(12): 2416-2421. doi: 10.13700/j.bh.1001-5965.2016.0869
引用本文: 孙杰, 李敏, 孙宾等 . 考虑初始损伤的脆性疲劳损伤模型及验证[J]. 北京航空航天大学学报, 2017, 43(12): 2416-2421. doi: 10.13700/j.bh.1001-5965.2016.0869
SUN Jie, LI Min, SUN Binet al. Brittle fatigue damage model including initial damage and model verification[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2416-2421. doi: 10.13700/j.bh.1001-5965.2016.0869(in Chinese)
Citation: SUN Jie, LI Min, SUN Binet al. Brittle fatigue damage model including initial damage and model verification[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2416-2421. doi: 10.13700/j.bh.1001-5965.2016.0869(in Chinese)

考虑初始损伤的脆性疲劳损伤模型及验证

doi: 10.13700/j.bh.1001-5965.2016.0869
基金项目: 

国家自然科学基金 11372320

详细信息
    作者简介:

    孙杰 男, 博士研究生。主要研究方向:结构动力学、损伤力学

    李敏 男, 博士, 教授, 博士生导师。主要研究方向:结构动力学

    通讯作者:

    李敏, E-mail: limin@buaa.edu.cn

  • 中图分类号: O346

Brittle fatigue damage model including initial damage and model verification

Funds: 

National Natural Science Foundation of China 11372320

More Information
  • 摘要:

    疲劳损伤导致的破坏是工程结构最常见的失效形式之一。利用不可逆热力学理论框架和损伤的微观力学,基于脆性损伤的机理,建立了一种新的脆性疲劳损伤模型。新模型推导严密,以应力幅和材料损伤参数为控制变量,考虑了材料的初始损伤,并以12Cr1MoV钢为例进行实验验证。结果表明:新模型包含了初始损伤变量,可以用来估算材料的初始损伤;新模型在疲劳过程的初期,损伤很小时,相比同类型疲劳损伤模型具有显著优势,同时新模型能够应用于脆性材料疲劳损伤的寿命预测;新模型比同类型疲劳损伤模型形式简单、参数少,且与实验结果符合的更好。

     

  • 图 1  损伤的微观-细观单元

    Figure 1.  Microscopic damage and meso-damage element

    图 2  不考虑初始损伤、考虑初始损伤新模型与实验值的结果对比

    Figure 2.  Comparison among new model without initial damage, new model with initial damage and experimental results

    图 3  新模型、文献[17]模型、文献[18]模型与实验值的结果对比

    Figure 3.  Comparison among new model, model of Ref.[17], model of Ref.[18]and experimental results

    表  1  DN/Nf的实测值

    Table  1.   Test values of D and N/Nf

    实验编号 D N/Nf
    1 0.15 0.35
    2 0.18 0.40
    3 0.20 0.60
    4 0.25 0.80
    5 0.50 0.95
    6 1.00 1.00
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-11-14
  • 录用日期:  2017-01-20
  • 刊出日期:  2017-12-20

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