Q420D高强钢横向十字焊接接头疲劳寿命数值模拟与试验验证
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。
十字焊接接头
疲劳寿命
S-N曲线
数值模拟
Q420D high-strength steel
cruciform weld joint
fatigue life
S-N curve
numerical simulation
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.
中图分类号 TU51 DOI 10.11973/jxgccl202112014
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目（51368018，51968024）
收稿日期 2020/9/8
修改稿日期 2021/9/8
网络出版日期
作者单位点击查看
备注程海根(1971-)，男，江西南昌人，教授，博士
引用该论文: CHENG Haigen,HU Cong,JIANG Yong. Numerical Simulation and Experimental Verification of Fatigue Life of Q420D High-Strength Steel Transverse-Cruciform Weld Joint[J]. Materials for mechancial engineering, 2021, 45(12): 78～83
程海根,胡聪,姜勇. Q420D高强钢横向十字焊接接头疲劳寿命数值模拟与试验验证[J]. 机械工程材料, 2021, 45(12): 78～83
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