首页|焊接结构随机振动疲劳分析方法研究与应用

焊接结构随机振动疲劳分析方法研究与应用

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针对焊接结构在服役过程中承受的随机动载荷频率与结构固有模态频率接近时,接头可能发生疲劳破坏,使传统单轴静载疲劳分析方法不再适用的问题,提出评估焊接结构的多轴随机振动疲劳分析方法.该方法将时域激励信号转化为自谱和互谱,并结合模态分解与结构应力方法,得到包括结构正应力与剪应力的自谱和互谱,基于路径依赖的最大范围法原理得到等效结构应力的功率谱,最后通过Dirlik模型计算出结构损伤和振动疲劳寿命.以某高速货车为例进行疲劳寿命分析与改进校核,验证了该方法可进一步提升焊接结构疲劳寿命预测的时效性和准确性.
Research and application of random vibration fatigue analysis method for welded structures
In the service process,welded structures often bear complex random dynamic load.When the dynamic load fre-quency is close to the natural modal frequency of the structure,fatigue failure may occur in the joint,at this point the tradi-tional fatigue analysis method of uniaxial static load is no longer applicable.A multi-axis random vibration fatigue analysis method for welded structures was presented.In this method,the time-domain excitation signals were transformed into self-spectrum and cross-spectrum,the self-spectrum and cross-spectrum including normal stress and shear stress was obtained by combining modal decomposition and structural stress method,and gets the power spectrum of equivalent structural stress was got based on PDMR principle.The structural damage and vibration fatigue life were calculated by using the Dir-lik model.At the same time,a high-speed freight car was taken as an example to analyze the fatigue life,and the timeliness and accuracy of fatigue life prediction of welded structures were verified.

welded structurerandom vibrationfatigue failuretime domainfrequency domainfatigue life

周晓坤、裴宪军、董平沙、贺茂盛、谢素明、付婷婷

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大连交通大学机械工程学院,辽宁 大连 116028

中车齐齐哈尔车辆有限公司大连研发中心,辽宁 大连 116052

东南大学 机械工程学院,江苏 南京 211189

密歇根大学船舶与海洋工程学院,美国 安阿伯市48109

北京交通大学机械与电子控制工程学院,北京 100044

中车齐车集团有限公司货车研究院,辽宁 大连 116052

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焊接结构 随机振动 疲劳破坏 时域 频域 疲劳寿命

国家高速列车技术创新中心研发计划资助项目国家自然科学基金资助项目国家重点研发计划资助项目

CXKY-02-01-012020121020902017YFB1201300

2024

计算机集成制造系统
中国兵器工业集团第210研究所

计算机集成制造系统

CSTPCD北大核心
影响因子:1.092
ISSN:1006-5911
年,卷(期):2024.30(2)
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