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赵尚超, 王东坡, 李向伟, 方吉. 焊接结构模态结构应力法程序开发及工程应用[J]. 焊接学报, 2023, 44(3): 1-7. DOI: 10.12073/j.hjxb.20220412002
引用本文: 赵尚超, 王东坡, 李向伟, 方吉. 焊接结构模态结构应力法程序开发及工程应用[J]. 焊接学报, 2023, 44(3): 1-7. DOI: 10.12073/j.hjxb.20220412002
ZHAO Shangchao, WANG Dongpo, LI Xiangwei, FANG Ji. Development and engineering application of modal structural stress method for welded structures[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(3): 1-7. DOI: 10.12073/j.hjxb.20220412002
Citation: ZHAO Shangchao, WANG Dongpo, LI Xiangwei, FANG Ji. Development and engineering application of modal structural stress method for welded structures[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(3): 1-7. DOI: 10.12073/j.hjxb.20220412002

焊接结构模态结构应力法程序开发及工程应用

Development and engineering application of modal structural stress method for welded structures

  • 摘要: 主S-N曲线法作为疲劳计算的新方法在焊接结构疲劳分析中被广泛采用. 为了实现该方法在试验载荷下基于稳态动力学计算结果开展焊接结构疲劳寿命预测,首先引入台架模型作为边界条件,实现将试验载荷作为仿真分析的输入,基于模态叠加法的稳态动力学理论获得较准确的焊缝动态响应. 其次在主S-N曲线法的准静态计算流程基础上,扩展其内涵,提出基于模态结构应力叠加的动态结构应力计算方法,该方法将稳态动力学计算的模态坐标与焊缝的模态结构应力进行叠加,实现动态结构应力计算及动态等效结构应力计算,再采用主S-N曲线进行寿命评估预测. 进一步开发了焊接结构模态结构应力法疲劳评估软件,基于该软件开展了车体疲劳评估和疲劳试验对比. 结果表明,该方法比传统方法更能有效地识别出动态加载下车体的疲劳破坏部位,验证了该方法在试验动态载荷加载下开展焊接结构疲劳评估的有效性和优越性,为研究焊接结构疲劳寿命评估理论和拓展主S-N曲线法提供了技术基础.

     

    Abstract: The main S-N curve method is a new method for fatigue calculation, which is widely used in fatigue analysis of welded structures. In order to predict the fatigue life of welded structures under the test load, firstly, the bench model is taken as the boundary condition to make the test load become the input of simulation analysis, and the more accurate dynamic response of weld is obtained through steady-state dynamic calculation. Second, in the master S-N curve method of quasi static calculation process, based on the introduction of dynamic structural stress based on modal structural stress superposition calculation method, the method to obtain the modal coordinates and calculated by the dynamic welding structure modal stress superposition structure, structure dynamic stress and the equivalent stress calculation, the method adopts the Lord S-N curve forecasting life assessment. Finally, the fatigue evaluation software of welded structure modal structure stress method is developed. The software is used to carry out the fatigue evaluation and fatigue test comparison. The results show that: this method can effectively identify the fatigue failure parts of the car body under dynamic loading, which verifies the effectiveness and superiority of this method in fatigue evaluation of welded structures under dynamic loading, and provides a technical basis for the study of fatigue life evaluation of welded structures and the expansion of the main S-N curve method.

     

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