摘要
构建一种基于非线性损伤理论的焊接疲劳设计模式,能有效地用于多级疲劳载荷作用下焊接接头的疲劳设计与分析。所构建的设计模式,不仅考虑了多级疲劳载荷的加载次序效应,也考虑了载荷间的相互影响。采用Manson-Halford累积损伤模型以及改进模型来处理加载次序效应,以应力比的形式来体现载荷间相互作用,利用所构建疲劳设计模式对标准焊接接头进行疲劳设计,讨论了不同疲劳载荷加载次序以及载荷级数等因素对焊接结构疲劳设计参数应力因数的影响,并将设计结果与基于传统Miner理论的设计结果进行比较。数值结果表明,基于非线性累积损伤理论所建的焊接疲劳设计模式,可对焊接接头的疲劳特性进行有效的设计分析,具有较高的精度和可信度。所建焊接结构疲劳设计模式能够较好地处理载荷次序效应以及载荷间的相互影响,且模型参数相对较少,可应用于实际工程设计。
A welding fatigue design model is constructed based on nonlinear damage theory,which can be effectively used for fatigue design and analysis of welded joints under multi-level fatigue load.The fatigue design model considers the load sequence effect and the influence of load interaction.The Manson-Halford cumulative damage model and its improved model are used to deal with the load sequence effect.The interaction between the loads is reflected in the form of stress ration.For the fatigue design of standard welded joints,influences of stress factor caused by different loading sequences and the level of load are discussed.Numerical examples are provided to test the performance of the proposed method,by comparing with the design results based on the traditional Miner theory,and satisfactory results are achieved with higher precision and reliability.The design model can better deal with the load sequence effect and the load interaction with less model parameters,and can be applied in engineering.
作者
薛齐文
杜秀云
XUE Qiwen;DU Xiuyun(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028;School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第6期32-38,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(10802015)
辽宁省自然科学基金联合基金(2015020119)
辽宁省研究生教育教学改革研究(2017)资助项目
