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单个边缘微观损伤对铝合金材料蚀坑应力集中效应的影响研究

刘治国 李旭东 陈川

刘治国, 李旭东, 陈川. 单个边缘微观损伤对铝合金材料蚀坑应力集中效应的影响研究[J]. 机械科学与技术, 2021, 40(3): 456-462. doi: 10.13433/j.cnki.1003-8728.20200075
引用本文: 刘治国, 李旭东, 陈川. 单个边缘微观损伤对铝合金材料蚀坑应力集中效应的影响研究[J]. 机械科学与技术, 2021, 40(3): 456-462. doi: 10.13433/j.cnki.1003-8728.20200075
LIU Zhiguo, LI Xudong, CHEN Chuan. Influence of Single Marginal Microcosmic Damage on Concentration Effect of Corrosion Pit Stress for Aluminum Alloy[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 456-462. doi: 10.13433/j.cnki.1003-8728.20200075
Citation: LIU Zhiguo, LI Xudong, CHEN Chuan. Influence of Single Marginal Microcosmic Damage on Concentration Effect of Corrosion Pit Stress for Aluminum Alloy[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 456-462. doi: 10.13433/j.cnki.1003-8728.20200075

单个边缘微观损伤对铝合金材料蚀坑应力集中效应的影响研究

doi: 10.13433/j.cnki.1003-8728.20200075
详细信息
    作者简介:

    刘治国(1976-), 副教授, 研究方向为飞机结构腐蚀疲劳寿命分析, qdnuaalzg@163.com

  • 中图分类号: TG174.3;V216.5

Influence of Single Marginal Microcosmic Damage on Concentration Effect of Corrosion Pit Stress for Aluminum Alloy

  • 摘要: 为获取边缘微观损伤对铝合金蚀坑产生的应力集中效应的影响及影响规律,采用ANSYS有限元方法,构建7B04铝合金半椭球体简化蚀坑模型、单个半椭球体包含一个边缘微观损伤的蚀坑模型,并基于线弹性断裂力学,开展两种蚀坑模型的应力集中效应计算分析。研究发现:边缘微观损伤对半椭球体蚀坑应力集中效应的数值大小、作用区域以及作用区域大小影响明显。包含与不包含边缘微观损伤的半椭球体蚀坑产生的应力集中系数最大值分别为Kt, max=3.359和Kt, max=2.24;包含边缘微观损伤的半椭球体蚀坑其应力集中效应明显的区域集中在边缘微观损伤与半椭球体蚀坑交汇位置的侧边;边缘微观损伤对点蚀损伤应力集中效应的影响与其表面尺寸、深度以及方位有关,应力集中系数随其深度与长度的比值(h/l)增加而增加,且Kt, θ=45°>Kt, θ=0
  • 图  1  蚀坑与简化模型

    图  2  1/4点蚀损伤模型有限元网格划分

    图  3  包含边缘微观损伤蚀坑形貌

    图  4  包含一个边缘微观椭球体蚀坑简化模型

    图  5  包含一个边缘微观椭球体蚀坑有限元网格划分(h/l=1、h/w=3)

    图  6  典型蚀坑形貌特征下应力分布图

    图  7  蚀坑形貌特征与应力集中系数关系

    图  8  典型蚀坑形貌特征下应力分布图(θ=0°、w=10 μm)

    图  9  典型蚀坑形貌特征下有限元网格及应力分布图(θ=45°、w=10 μm、l=15 μm、h=15 μm)

    图  10  不同微观椭球体特征形貌应力集中系数计算结果

    表  1  不同特征形貌蚀坑应力集中系数Kt计算结果(W=60 μm)

    L/W H/W
    0.1 0.2 0.4 0.8 1.0
    1 1.27 1.49 1.77 2.13 2.24
    2 1.12 1.21 1.35 1.54 1.60
    3 1.07 1.12 1.21 1.33 1.37
    4 1.05 1.08 1.15 1.23 1.26
    8 1.02 1.03 1.06 1.09 1.10
    下载: 导出CSV

    表  2  不同特征形貌蚀坑应力集中系数计算结果(θ=0, w=2 μm, l=3 μm)

    h/μm 1.5 3.0 4.5 6.0 7.5 9.0 12.0
    Kt 3.008 3.351 3.355 3.355 3.352 3.341 3.004
    下载: 导出CSV

    表  3  不同特征形貌蚀坑应力集中系数计算结果(θ=0, w=2 μm)

    h/μm l/μm Kt h/μm l/μm Kt
    5 5 2.671 15 5 2.278
    10 2.841 10 2.354
    15 2.906 15 2.368
    20 2.925 20 2.374
    下载: 导出CSV
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  • 收稿日期:  2019-11-12
  • 刊出日期:  2021-03-01

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