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基于缺口应力法的ⅡW多轴疲劳准则分析

胡鑫, 严仁军, 谌伟, 胡耀愚, 何丰

胡鑫, 严仁军, 谌伟, 胡耀愚, 何丰. 基于缺口应力法的ⅡW多轴疲劳准则分析[J]. 焊接学报, 2019, 40(7): 77-81. DOI: 10.12073/j.hjxb.2019400185
引用本文: 胡鑫, 严仁军, 谌伟, 胡耀愚, 何丰. 基于缺口应力法的ⅡW多轴疲劳准则分析[J]. 焊接学报, 2019, 40(7): 77-81. DOI: 10.12073/j.hjxb.2019400185
shu
HU Xin, YAN Renjun, SHEN Wei, HU Yaoyu, HE Feng. Research on ⅡW multiaxial fatigue criterion based on notch stress approach[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 77-81. DOI: 10.12073/j.hjxb.2019400185
Citation: HU Xin, YAN Renjun, SHEN Wei, HU Yaoyu, HE Feng. Research on ⅡW multiaxial fatigue criterion based on notch stress approach[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 77-81. DOI: 10.12073/j.hjxb.2019400185
shu

基于缺口应力法的ⅡW多轴疲劳准则分析

  • 1.

    武汉理工大学 高性能舰船技术教育部重点实验室, 武汉 430063;武汉理工大学 交通学院, 武汉 430063

  • 2.

    湖北航达科技有限公司, 武汉 430040

基金项目: 国家自然科学基金资助项目（51609185）

Research on ⅡW multiaxial fatigue criterion based on notch stress approach

  • 1.

    Key Laboratory of High Performance Ship Technology of Ministry of Education, Wuhan University of Technology, Wuhan 430063, China;School of Transportation, Wuhan University of Technology, Wuhan 430063, China

  • 2.

    Hubei Hang Da Technology Co., Ltd., Wuhan 430040, China

摘要

    摘要
  • 摘要: 焊接接头的多轴疲劳强度评估是领域内的复杂课题.结合缺口应力法，利用ⅡW多轴疲劳准则对已公开发表的文献中的多轴疲劳试验数据进行了重新评估.结果表明，缺口应力系统下的比例加载与非比例加载数据点重合性较好；ⅡW推荐的单轴疲劳评估S-N曲线不适用于多轴疲劳评估，循环次数在1×104 ~1×105范围内时，可能得到偏危险的评估结果；而高于1×105次时，评估结果过于保守.基于此，拟合得到了存活率Ps=97.7%的S-N评估曲线，其疲劳等级FAT=430 MPa，斜率m=5.8，同时适用于比例加载与非比例加载，可为工程焊接结构疲劳寿命预估提供参考.
    Abstract: Multiaxial fatigue strength evaluation of welded joints is a complex subject for engineering. Based on ⅡW multiaxial criterion, experimental data from published literatures were re-evaluated using notch stress approach. The results reveal that the uniaxial fatigue assessment S-N curve recommended by ⅡW is unfit for multiaxial fatigue. Whereas, the data points of proportional loading and non-proportional loading have good coincidence under notched stress system. The assessment result is dangerous when the number of cycles is in the range of 1×104 ~1×105, and it is too conservative over 1×105 times. Based on this, the S-N curve (FAT=430 MPa, m=5.8) with the probability of survival Ps=97.7% is proposed for both proportional and non-proportional loading. This work can provide useful references for fatigue life prediction of engineering welded structures.
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    • 参考文献(13)
  • [1] 刘刚,黄如旭,黄一.复杂焊接接头多轴疲劳强度评估的等效热点应力法[J].焊接学报, 2012, 33(6):10-14 Liu Gang, Huang Ruxu, Huang Yi. Equivalent hot spot stress approach for multiaxial fatigue strength assessment of complex welded joints[J]. Transactions of the China Welding Institution, 2012, 33(6):10-14
    [2] 周张义,王雨舟,杨欣.基于不同应力法的焊接构架纵向角接头疲劳累积损伤评估[J].焊接学报, 2018, 39(8):18-22 Zhou Zhangyi, Wang Yuzhou, Yang Xin. Fatigue cumulative damage assessment of longitudinal fillet welded gusset in welded frame based on different stress approaches[J]. Transactions of the China Welding Institution, 2018, 39(8):18-22
    [3] 王东坡,曹舒,邓彩艳.基于缺口应力法的场桥导轨焊接结构疲劳性能评估[J].焊接学报, 2016, 37(4):5-8 Wang Dongpo, Cao Shu, Deng Caiyan. Notch stess concepts for fatigue assessment of welded portal crane rail structure[J]. Transactions of the China Welding Institution, 2016, 37(4):5-8
    [4] Radaj D, Sonsino C, Fricke W. Recent developments in local concepts of fatigue assessment of welded joints[J]. International Journal of Fatigue, 2009, 31(1):2-11.
    [5] Sonsino C M, Fricke W, de Bruyne F, et al. Notch stress concepts for the fatigue assessment of welded joints-Background and applications[J]. International Journal of Fatigue, 2012, 34(1):2-16.
    [6] Sonsino C. Multiaxial fatigue assessment of welded joints-recommendations for design codes[J]. International Journal of Fatigue, 2009, 31(1):173-187.
    [7] Radaj D, Lazzarin P, Berto F. Generalised Neuber concept of fictitious notch rounding[J]. International Journal of Fatigue, 2013, 51(6):105-115.
    [8] Sonsino C M. Multiaxial fatigue of welded joints under in-and out-of-phase local strains and stresses[J]. International Journal of Fatigue, 1995, 17(1):55-70.
    [9] Amstutz H K, Störzel, Seeger T. Fatigue crack growth of a welded tube-flange connection under bending and torsional loading[J]. Fatigue&Fracture of Engineering Materials&Structures, 2010, 24(5):357-368.
    [10] Bertini L, Frendo F, Marulo G. Effects of plate stiffness on the fatigue resistance and failure location of pipe-to-plate welded joints under bending[J]. International Journal of Fatigue, 2016, 90(6):78-86.
    [11] Yousefi F, Witt M, Zenner H. Fatigue strength of welded joints under multiaxial loading:experiments and calculations[J]. Fatigue&Fracture of Engineering Materials&Structures, 2010, 24(5):339-355.
    [12] Witt M, Zenner H. Multiaxial fatigue behaviour of welded flange-tube connections under combined loading. experiments and lifetime calculation[C]//In:5th International conference on biaxial/multiaxial fatigue and fracture, Cracow, Poland; 1997:421-434.
    [13] Fricke W. Guideline for the fatigue assessment by notch stress analysis for welded structures[C]//Assembly of International Institute of Welding, 2008:1-133.
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  • 收稿日期:  2019-01-03

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