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高温合金电子束焊接头缺口疲劳寿命预测

刘小刚 于盛吉 许磊

刘小刚, 于盛吉, 许磊. 高温合金电子束焊接头缺口疲劳寿命预测[J]. 航空动力学报, 2023, 38(5):1210-1216 doi: 10.13224/j.cnki.jasp.20210542
引用本文: 刘小刚, 于盛吉, 许磊. 高温合金电子束焊接头缺口疲劳寿命预测[J]. 航空动力学报, 2023, 38(5):1210-1216 doi: 10.13224/j.cnki.jasp.20210542
LIU Xiaogang, YU Shengji, XU Lei. Fatigue life prediction of electron beam welding joint of superalloy[J]. Journal of Aerospace Power, 2023, 38(5):1210-1216 doi: 10.13224/j.cnki.jasp.20210542
Citation: LIU Xiaogang, YU Shengji, XU Lei. Fatigue life prediction of electron beam welding joint of superalloy[J]. Journal of Aerospace Power, 2023, 38(5):1210-1216 doi: 10.13224/j.cnki.jasp.20210542

高温合金电子束焊接头缺口疲劳寿命预测

doi: 10.13224/j.cnki.jasp.20210542
基金项目: 国家科技重大专项(2017-Ⅳ-0012-0049); 中央高校基本科研业务费(NS2021014)
详细信息
    作者简介:

    刘小刚(1977-),男,副教授,博士,主要从事结构疲劳与断裂力学方面的研究

  • 中图分类号: V261.9

Fatigue life prediction of electron beam welding joint of superalloy

  • 摘要:

    为了研究GH4169电子束焊接头缺口疲劳寿命预测方法,设计并开展了其缺口件的疲劳试验,基于临界距离理论,提出了适用于不同缺口形状的电子束焊接头疲劳寿命预测方法。通过试验,获得了GH4169电子束焊接头U型、V-1型及V-2型3种缺口件的名义应力-寿命曲线。基于V-2型缺口件试验结果,提出了一种临界距离的反推方法,确定了GH4169电子束焊接头缺口件的特征尺寸。据此,分别采用临界距离点法和线法对缺口件疲劳寿命预测。结果表明:临界距离点法对文中缺口件的适应性更好。进一步分析发现,对于不同缺口形状,当其理论应力集中系数相近时,采用相同的特征尺寸可以获得较好的寿命预测结果,均在2倍分散带以内。

     

  • 图 1  TCD中的点法、线法和面法

    Figure 1.  TCD applied in the form of the point, line and area method

    图 2  两种疲劳曲线下$ {L_{\text{m}}} $-$ {N_{\text{f}}} $关系

    Figure 2.  $ {L_{\text{m}}} $-$ {N_{\text{f}}} $ relationship by using two different fatigue curves

    图 3  焊接接头试验件尺寸(单位:mm)

    Figure 3.  Size of welded test pieces (unit: mm)

    图 4  各试验件$ {\sigma _{{\text{nom}}}} $-$ {N_{\text{f}}} $曲线

    Figure 4.  $ {\sigma _{{\text{nom}}}} $-$ {N_{\text{f}}} $ curve of each test piece

    图 5  应力云图

    Figure 5.  Stress nephogram

    图 6  V-2型缺口试验件根部应力分布

    Figure 6.  Stress distribution at the root of V-2 notch test piece

    图 7  V-2型缺口焊接接头试验件$ {L_{\text{m}}} $-$ N_{\text{f}}^* $曲线

    Figure 7.  $ {L_{\text{m}}} $-$ N_{\text{f}}^* $ curve of V-2 notch welded test pieces

    图 8  预测寿命循环数与试验寿命循环数对比

    Figure 8.  Comparison of forecast life and test life cycle number

    表  1  各缺口的理论集中系数Kt

    Table  1.   Kt of each notched joint

    缺口类型Kt
    U型缺口2.42
    V-1型缺口3.02
    V-2型缺口2.47
    下载: 导出CSV

    表  2  试验载荷级

    Table  2.   Test load class

    载荷级光滑件U型缺口V-1型缺口V-2型缺口
    $ {\sigma _{{\text{nom,1}}}} $/MPa1024443428583
    $ {\sigma _{{\text{nom,2}}}} $/MPa956416388533
    $ {\sigma _{{\text{nom,3}}}} $/MPa878383358483
    $ {\sigma _{{\text{nom,4}}}} $/MPa805356328433
    $ {\sigma _{{\text{nom,5}}}} $/MPa732328298383
    下载: 导出CSV

    表  3  V-2型缺口焊接接头试验件特征尺寸

    Table  3.   Characteristic dimensions of V-2 notch welded test pieces

    $ {\sigma _{{\text{nom}}}} $/MPa$ N_{\text{f}}^* $$ {L_{\text{m}}} $/mm
    583714791.3
    533956611.2
    4831317551.1
    4331879341.0
    3832800220.9
    下载: 导出CSV
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  • 收稿日期:  2021-09-26
  • 网络出版日期:  2023-02-01

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