Numerical Simulation and Experimental Verification of Fatigue Life of Q420D High-Strength Steel Transverse-Cruciform Weld Joint
-
摘要: 通过疲劳试验拟合得到Q420D高强钢横向十字焊接接头的应力幅-疲劳寿命（S-N）曲线（试验拟合），采用ANSYS与FE-SAFE软件联合仿真技术预测该十字接头的疲劳寿命并拟合得到S-N曲线（数值拟合），对比分析了数值拟合和试验拟合结果，并分析了现行规范对十字接头疲劳寿命的评价效果。结果表明：十字接头疲劳寿命数值拟合值与试验拟合值的相对误差不大于3.49%，疲劳极限相对误差为0.93%，说明应用ANSYS与FE-SAFE软件联合仿真技术预测十字接头疲劳寿命可靠；试验拟合S-N曲线（存活率50%）与ANSI规范设计曲线吻合较好，而95%存活率下的试验拟合曲线与DNV规范设计曲线吻合较好；当循环次数高于2×105周次时，EN规范较ANSI规范能更好地评估十字焊接接头疲劳寿命，且具有足够的安全储备。Abstract: The fitting stress amplitude-fatigue life (S-N)curve of Q420D high-strength steel transverse-cruciform weld joint was obtained by fatigue tests (test fitting).The fatigue lives of the cruciform joint were predicted by the co-simulation of ANSYS and FE-SAFE softwares, and then the S-N curve was obtained by fitting (numerical fitting).The results by test fitting and numerical fitting were analyzed in contrast.The effects of current code evaluating the fatigue life of the cruciform joint were analyzed.The results show that the relative errors between the numerical fitted and the test fitted fatigue lives of the cruciform joint were not higher than 3.49%, and the relative error of the fatigue limit was 0.93%, indicating the application of ANSYS and FE-SAFE software co-simulation technique to predicting the fatigue life of the cruciform joint was reliable.The test fitted S-N curve (50% survival probability)was in good agreement with the ANSI code designed curve, while the test fitted curve at 95% survival probability was in good agreement with the DNV code designed curve.When the number of cycles was higher than 2×105 cycles, the EN code could better evaluate the fatigue life of the cruciform weld joint than the ANSI code, and had sufficient safety margins.
-
Keywords:
- Q420D high-strength steel /
- cruciform weld joint /
- fatigue life /
- S-N curve /
- numerical simulation
-
-
[1] 张彦华.焊接结构疲劳分析[M].北京:化学工业出版社,2013:18-29. ZHANG Y H.Fatigue analysis of welded structures[M].Beijing:Chemical Industry Press,2013:18-29.
[2] 郭宏超,皇垚华,刘云贺,等.Q460D高强钢及其螺栓连接疲劳性能试验研究[J].建筑结构学报,2018,39(8):165-172. GUO H C,HUANG Y H,LIU Y H,et al.Experimental study on fatigue property of Q460 high-strength steel and its bolted connections[J].Journal of Building Structures,2018,39(8):165-172.
[3] 郭宏超,万金怀,刘云贺,等.Q690D高强钢焊缝连接疲劳性能试验研究[J].土木工程学报,2018,51(9):1-9. GUO H C,WAN J H,LIU Y H,et al.Experimental study on fatigue performance of Q690D high strength steel welded joints[J].China Civil Engineering Journal,2018,51(9):1-9.
[4] 王丽,赵欣欣,荣峤,等.高性能桥梁钢典型焊接接头疲劳性能试验研究[J].土木工程学报,2016,49(6):61-66. WANG L,ZHAO X X,RONG Q,et al.Experimental study on fatigue performance of typical welded joints of high performance steel[J].China Civil Engineering Journal,2016,49(6):61-66.
[5] PIJPERS R J M, KOLSTEIN M H, ROMEIJN A, et al.Fatigue strength of base material and butt welds made of S690 and S1100[C]//5th International Conference on Advances in Steel Structures.London:Taylor and Francis, 2007.
[6] KIM I T,KAINUMA S.Fatigue life assessment of load-carrying fillet-welded cruciform joints inclined to uniaxial cyclic loading[J].International Journal of Pressure Vessels and Piping,2005,82(11):807-813.
[7] FRICKE W,DOERK O.Simplified approach to fatigue strength assessment of fillet-welded attachment ends[J].International Journal of Fatigue,2006,28(2):141-150.
[8] KAI X,YONG L,LIE S T.Loading-carrying welds joints analysis using boundary element method[J].International Journal of Solids and Structures,2005,42(9/10):2965-2975.
[9] 谭真,郭广文.工程合金热物性[M].北京:冶金工业出版社,1994. TAN Z,GUO G W.Thermophysical properties of engineering alloys[M].Beijing:Metallurgical Industry Press,1994.
[10] 王文东,姜勇,胡聪,等.复杂环境下对接焊缝疲劳性能数值分析[J].公路,2020,65(5):155-159. WANG W D,JIANG Y,HU C,et al.Numerical analysis of fatigue performance of butt welds in complex environment[J].Highway,2020,65(5):155-159.
[11] 刘兵,何国球,蒋小松,等.材料疲劳寿命的影响因素和研究方法[J].材料导报,2011,25(9):103-106. LIU B,HE G Q,JIANG X S,et al.Review on effect factor and research method of material fatigue life[J].Materials Review,2011,25(9):103-106.
计量
- 文章访问数: 9
- HTML全文浏览量: 0
- PDF下载量: 2
下载:
