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Experimental investigation of the fatigue crack propagation in a closed-cell aluminum alloy foam

机译：闭孔铝合金泡沫疲劳裂纹扩展的实验研究

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摘要

Fatigue crack propagation in a closed-cell aluminum alloy foam is experimentally investigated in this work. A series of fatigue tests are conducted to obtain the a-N curves (i.e. crack length vs loading cycle number) and da/ dN-ΔK curves (fatigue crack propagation rate vs stress intensity). Statistical analysis is carried out to assess the stochastic and scattering characteristics in the fatigue crack propagation of the foam, based on which a statistical fatigue crack propagation model is developed. Furthermore, the fracture surfaces of the foam specimens are characterized, as well as the fatigue fracture morphologies. It is demonstrated that the structural heterogeneity inherent in the material and the difference in the cell structures between different specimens account for the great scatter of the fatigue crack propagation in the close-cell aluminum alloy foam.
机译：在这项工作中，实验研究了闭孔铝合金泡沫中的疲劳裂纹扩展。进行一系列疲劳测试以获得a-N曲线（即裂纹长度与载荷循环次数）和da /dN-ΔK曲线（疲劳裂纹扩展速率与应力强度）。进行统计分析以评估泡沫材料疲劳裂纹扩展中的随机和散射特性，在此基础上建立了统计疲劳裂纹扩展模型。此外，表征了泡沫样品的断裂表面以及疲劳断裂形态。结果表明，材料固有的结构异质性以及不同试样之间孔结构的差异导致了闭孔铝合金泡沫中疲劳裂纹扩展的极大分散。

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  • 来源
    《Materials Science and Engineering》 |2017年第21期|424-431|共8页
  • 作者

    Xueling Fan; Modi Zhao; Tiejun Wang;

  • 作者单位

    State Key Laboratory for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, Department of Engineering Mechanics, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum alloy foam; Fatigue crack propagation; Statistical mechanics; SEM observation;

    机译：铝合金泡沫;疲劳裂纹扩展;统计力学;扫描电镜观察;

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