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Fatigue Assessment of Welded Joints in AZ31B Magnesium Alloy by a Critical Plane Method
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Fatigue Assessment of Welded Joints in AZ31B Magnesium Alloy by a Critical Plane Method
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National Natural Science Foundation of China (51175364)

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    摘要:

    通過有限元軟件模擬橫向十字接頭的實際焊接過程，并進行溫度場和應(yīng)力場分析，采用基于Dang Van準(zhǔn)則考慮焊接殘余應(yīng)力的臨界面法對AZ31B鎂合金典型角接頭型式——橫向十字接頭進行了疲勞評定研究，并與疲勞試驗結(jié)果進行對比分析。結(jié)果表明，法國焊接研究所提出的鋼材參數(shù)及國內(nèi)研究者提出的鋁合金材料的參數(shù)均不適用于AZ31B鎂合金橫向十字接頭，需要進行修正；經(jīng)試驗研究將參數(shù)修正為α*=0.5，β*=55 MPa，并擬合出相應(yīng)的Dang Van圖形，其結(jié)果與疲勞試驗結(jié)果相吻合；說明修正后的臨界面法可以對AZ31B鎂合金橫向十字接頭進行合理的疲勞評定，而且依據(jù)應(yīng)力集中大小，可以有效預(yù)測試件可能的疲勞斷裂位置

    Abstract:

    The welding process of transverse cross joints was simulated by temperature field and welding residual stress fields in AZ31B magnesium alloy. On the basis of Dang Van criterion, considering the effect of welding residual stress, the critical plane method was used to assess the fatigue properties of the transverse cross joints in AZ31B magnesium alloy, and then the results were compared with the conventional fatigue test. The results show that the parameters for steel recommended by the French Welding Institute and for aluminum alloy recommended by investigators in china are all not suitable for AZ31B magnesium alloy which need to be amended as α*=0.5, and β*=55 MPa. Furthermore, the Dang Van curve is fitted and the result is consistent with the fatigue test, and the modified Dang Van criterion could assess the transverse cross joints in AZ31B magnesium alloy reasonably. According to the stress concentration, the possible failure position of specimens could be prognosticated

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閆志峰,賀秀麗,王文先,張紅霞. Fatigue Assessment of Welded Joints in AZ31B Magnesium Alloy by a Critical Plane Method[J].稀有金屬材料與工程,2014,43(11):2669~2674.[Yan Zhifeng, He Xiuli, Wang Wenxian, Zhang Hongxia. Fatigue Assessment of Welded Joints in AZ31B Magnesium Alloy by a Critical Plane Method[J]. Rare Metal Materials and Engineering,2014,43(11):2669~2674.]
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  • 收稿日期:2013-11-08
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  • 在線發(fā)布日期: 2015-04-07
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