提高焊接结构疲劳寿命的刚度协调策略与应用

丁彦闯; 兆文忠

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提高焊接结构疲劳寿命的刚度协调策略与应用

丁彦闯, 兆文忠

文章导航 > 焊接学报 > 2007 > (12): 31-34

丁彦闯, 兆文忠. 提高焊接结构疲劳寿命的刚度协调策略与应用[J]. 焊接学报, 2007, (12): 31-34.

引用本文:

丁彦闯, 兆文忠. 提高焊接结构疲劳寿命的刚度协调策略与应用[J]. 焊接学报, 2007, (12): 31-34.

DING Yanchuang, ZHAO Wenzhong. Stiffness coordination strategy for increasing fatigue life and its application in welded structure[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (12): 31-34.

Citation:

DING Yanchuang, ZHAO Wenzhong. Stiffness coordination strategy for increasing fatigue life and its application in welded structure[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (12): 31-34.

提高焊接结构疲劳寿命的刚度协调策略与应用

大连交通大学机械工程学院, 辽宁大连 116028

基金项目: 国家863高技术研究发展计划项目(2006AA04Z160)

Stiffness coordination strategy for increasing fatigue life and its application in welded structure

School of Mechanical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China

摘要: 焊接结构疲劳破坏的力学本质是局部应力集中,应力集中又是刚度突变所为,从刚度协调的角度分析了应力集中的原因。基于国际焊接学会IIW标准计算了对接平焊缝在不同刚度下的疲劳寿命,结果表明,焊缝磨平后疲劳寿命至少提高3.86倍;对盖板加强梁的疲劳寿命分析表明,加强板厚度增加1倍,则刚度增加1倍,而其疲劳寿命降低1倍;两个IIW标准算例证实了刚度协调对提高疲劳寿命的作用。基于实测动应力的焊接构架疲劳寿命预测,同样说明了刚度协调能显著提高结构的疲劳寿命,预测结果得到了试验验证。
- 焊接结构 /
- 刚度协调 /
- 疲劳寿命
Abstract: The mechanical nature of welded structure fatigue damage is the local stress concentration, and the severity of the stress concentration is depending on the change of stiffness.From the point of stiffness coordination, the causes of stress concentration are analyzed.Based on IIW (International Institute of Welding) standards, the relative fatigue life of butt joint is calculated.Results show the fatigue life increase at least 3.86 times with the smoothened weld.The fatigue life analysis of flat beam with strengthen plate shows that the plate thickness increase 1 times i.e., the local stiffness increase 1 times, the fatigue life decrease 1 times.The two examples of IIW confirm that the stiffness coordination is very important to improve fatigue life.Based on the measured dynamic stress, the fatigue life of welded frame is predicted.Result shows that the stiffness coordination can significantly increase the fatigue life.The fatigue life prediction of welded frame is certificated by the experimentation.
- welded structure /
- stiffness coordination /
- fatigue life

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提高焊接结构疲劳寿命的刚度协调策略与应用

大连交通大学机械工程学院, 辽宁大连 116028

基金项目: 国家863高技术研究发展计划项目(2006AA04Z160)

收稿日期: 2007-07-03

关键词:

焊接结构 /

刚度协调 /

疲劳寿命

摘要: 焊接结构疲劳破坏的力学本质是局部应力集中,应力集中又是刚度突变所为,从刚度协调的角度分析了应力集中的原因。基于国际焊接学会IIW标准计算了对接平焊缝在不同刚度下的疲劳寿命,结果表明,焊缝磨平后疲劳寿命至少提高3.86倍;对盖板加强梁的疲劳寿命分析表明,加强板厚度增加1倍,则刚度增加1倍,而其疲劳寿命降低1倍;两个IIW标准算例证实了刚度协调对提高疲劳寿命的作用。基于实测动应力的焊接构架疲劳寿命预测,同样说明了刚度协调能显著提高结构的疲劳寿命,预测结果得到了试验验证。