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焊接结构切口等效应力修正方法研究与应用分析

张哲 王悦东 刘本末

张哲, 王悦东, 刘本末. 焊接结构切口等效应力修正方法研究与应用分析[J]. 机械科学与技术, 2022, 41(8): 1254-1260. doi: 10.13433/j.cnki.1003-8728.20220147
引用本文: 张哲, 王悦东, 刘本末. 焊接结构切口等效应力修正方法研究与应用分析[J]. 机械科学与技术, 2022, 41(8): 1254-1260. doi: 10.13433/j.cnki.1003-8728.20220147
ZHANG Zhe, WANG Yuedong, LIU Benmo. Correction Method of Notch Equivalent Stress of Welded Structure and Application Analysis[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(8): 1254-1260. doi: 10.13433/j.cnki.1003-8728.20220147
Citation: ZHANG Zhe, WANG Yuedong, LIU Benmo. Correction Method of Notch Equivalent Stress of Welded Structure and Application Analysis[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(8): 1254-1260. doi: 10.13433/j.cnki.1003-8728.20220147

焊接结构切口等效应力修正方法研究与应用分析

doi: 10.13433/j.cnki.1003-8728.20220147
基金项目: 

大连市科技创新基金计划项目 2019J11CY017

国铁集团科技研究开发计划项目 K2021J006

详细信息
    作者简介:

    张哲(1997-), 硕士研究生, 研究方向为车辆结构分析与结构疲劳虚拟仿真, zz15140397203@126.com

    通讯作者:

    王悦东, 教授, 博士生导师, wydstar@163.com

  • 中图分类号: U270.38+9

Correction Method of Notch Equivalent Stress of Welded Structure and Application Analysis

  • 摘要: 为了提高16Mn钢焊接接头疲劳寿命预测的准确程度,首先应用3种不同方法对十字焊接接头的疲劳寿命进行预测,验证了切口应力等效取值法考虑了应力集中对16Mn钢疲劳寿命的影响。其次,采用基于切口应力强度因子理论的切口应力等效取值法对焊接接头的疲劳寿命进行预测。与试验结果对比表明:应用切口应力等效取值法对16Mn钢焊接接头寿命的评估结果存在误差。结合16Mn钢十字焊接接头试验结果,引入切口等效应力修正系数,得到适用于16Mn钢常用焊接接头的修正切口等效应力公式。
  • 图  1  不同拐角对应的p

    图  2  受分析的结构边缘

    图  3  十字焊接接头

    图  4  十字焊接接头有限元模型

    图  5  3种预测结果对比

    图  6  试验结果与预测结果对比

    图  7  验证1)所用接头结构尺寸

    图  8  验证2)所用接头结构尺寸

    图  9  验证2)试验结果与预测结果对比

    表  1  主S-N曲线参数(钢材)

    统计依据 Cd h
    中值 19 930.2 0.319 5
    +2σ 28 626.5 0.319 5
    -2σ 13 875.7 0.319 5
    +3σ 34 308.1 0.319 5
    -3σ 11 577.9 0.319 5
    下载: 导出CSV

    表  2  切口应力等效取值点分段函数式参数

    参数 as/mm
    1~10 10~100 100~1 000
    A/mm 0.520 67 0.808 75 2.059 8
    B 0.139 15 0.056 5 0.009 28
    C/mm-1 -0.010 92 -8.410 88×10-4 -1.970 16×10-5
    D/mm-2 6.350 04×10-4 7.238 25×10-6 1.906 44×10-8
    E/mm-3 -1.602 56×10-5 -2.486 89×10-8 -6.860 43×10-12
    下载: 导出CSV

    表  3  不同应力水平下的切口等效应力

    应力水平σn、MPa 125 135 145 155 165 175
    切口等效应力σy、MPa 140 151 162 174 185 196
    下载: 导出CSV

    表  4  不同应力水平下的切口等效应力和预测寿命

    Δσn/MPa Δσy/MPa 预测寿命N/次
    85 95.32 1 992 970
    97 108.32 1 358 154
    101 112.65 1 207 394
    105 116.98 1 078 146
    108 121.32 988 428
    110 150.78 966 707
    120 133.99 717 503
    125 139.92 630 088
    128 142.98 590 509
    140 156.03 454 377
    147 164.64 386 739
    151 168.97 357 746
    155 173.00 333 352
    163 181.97 286 431
    175 196.74 226 654
    下载: 导出CSV
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  • 收稿日期:  2021-11-04
  • 刊出日期:  2022-08-25

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