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5083铝合金带吻接FSW接头疲劳强度分析

米鹏 王瑞杰 杨庆鹤

米鹏, 王瑞杰, 杨庆鹤. 5083铝合金带吻接FSW接头疲劳强度分析[J]. 机械科学与技术, 2021, 40(3): 463-469. doi: 10.13433/j.cnki.1003-8728.20200030
引用本文: 米鹏, 王瑞杰, 杨庆鹤. 5083铝合金带吻接FSW接头疲劳强度分析[J]. 机械科学与技术, 2021, 40(3): 463-469. doi: 10.13433/j.cnki.1003-8728.20200030
MI Peng, WANG Ruijie, YANG Qinghe. Influence of Defect Depth of Kissing Bond on Fatigue Strength of AA5083 FSW Butt Joints[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 463-469. doi: 10.13433/j.cnki.1003-8728.20200030
Citation: MI Peng, WANG Ruijie, YANG Qinghe. Influence of Defect Depth of Kissing Bond on Fatigue Strength of AA5083 FSW Butt Joints[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 463-469. doi: 10.13433/j.cnki.1003-8728.20200030

5083铝合金带吻接FSW接头疲劳强度分析

doi: 10.13433/j.cnki.1003-8728.20200030
基金项目: 

国家自然科学基金项目 51065012

详细信息
    作者简介:

    米鹏(1993-), 硕士, 研究方向为机械结构疲劳强度, 18090016609@163.com

    通讯作者:

    王瑞杰, 副教授, 硕士生导师, wrj@kust.edu.cn

  • 中图分类号: TG407

Influence of Defect Depth of Kissing Bond on Fatigue Strength of AA5083 FSW Butt Joints

  • 摘要: 针对具有吻接缺陷的5083铝合金板搅拌摩擦焊(FSW)对接接头试件,探索了吻接缺陷对搅拌摩擦焊对接接头疲劳强度的影响。使用维氏显微硬度仪测量了试件接头焊缝横截面硬度分布,测试结果显示,硬度值分布大致呈W趋势。采用MTS809疲劳测试机对试件进行疲劳测试,得到了不同吻接深度拉伸式样的名义应力-寿命关系。对疲劳断口进行SEM扫描并测量了接头吻接缺陷深度,发现疲劳裂纹均起源于吻接缺陷区域。通过有限元软件ABAQUS对不同吻接深度试件进行了应力应变分析,分别采用缺口应力法和局部应力应变法对试件进行了疲劳寿命预测。预测结果表明,缺口应力法在低周疲劳预测时效果较好。
  • 图  1  试件尺寸

    图  2  显微硬度测试

    图  3  焊缝表面轻微凹陷处

    图  4  名义应力-寿命关系曲线

    图  5  Fb002试件疲劳断口形貌

    图  6  Fb015试件疲劳断口电镜扫描图

    图  7  Fb012试件疲劳断口电镜扫描图

    图  8  0.5 mm吻接深度试件有限元模型

    图  9  Fb007试件不同分析步的最大主力分布

    图  10  不同吻接深度试件在最大载荷196 MPa变形模拟

    图  11  铝合金疲劳曲线

    图  12  缺口应力法预测疲劳寿命

    图  13  应力-应变曲线

    图  14  局部应力应变法预测疲劳寿命

    表  1  5083铝合金主要化学成分 %

    w(Si) w(Cu) w(Mg) w(Zn) w(Mn) w(Ti) w(Cr) w(Fe)
    ≤0.4 ≤0.1 4.0~4.9 ≤0.25 0.4~1.0 ≤0.15 0.05~0.25 ≤0.4
    下载: 导出CSV

    表  2  试件最大载荷、实验寿命及吻接深度

    试件编号 最大载荷/
    MPa
    实验疲劳
    寿命/次
    吻接深度/
    mm
    Fb007 196.078 431 1 771 0.51
    Fb002 176.470 588 3 174 0.49
    Fb016 149.019 608 4 758 0.51
    Fb009 129.411 765 7 687 0.49
    Fb015 123.529 412 5 036 0.51
    Fb005 117.647 059 7 514 0.51
    Fb021 101.960 784 8 948 0.48
    Fb022 94.117 647 1 46 542 0.49
    Fb013 90.196 078 4 52 431 0.52
    Fb027 87.254 902 59 606 0.51
    Fb023 205.882 353 4 196 0.31
    Fb008 168.627 451 3 039 0.55
    Fb017 143.137 255 5 200 0.55
    Fb018 133.333 333 11 527 0.45
    Fb019 113.725 490 5 049 0.71
    Fb020 109.803 922 7 086 0.65
    下载: 导出CSV

    表  3  5083铝合金疲劳参数[17]

    疲劳强度
    系数σ′f
    疲劳延性
    系数ε′f
    疲劳强度
    指数b
    疲劳延性
    指数c
    711 MPa 0.405 -0.122 -0.692
    下载: 导出CSV
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  • 收稿日期:  2019-09-27
  • 刊出日期:  2021-03-01

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