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Prediction of Welding Deformation of Underframe 被引量:1
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作者 陈俊梅 陆皓 +2 位作者 汪建华 陈卫新 郝达军 《Journal of Shanghai Jiaotong university(Science)》 EI 2004年第1期10-14,共5页
An inherent strain method was applied to the welding deformation analysis of left girder of GM’s Buick’s chassis underframe assembly. Three models are used in the calculation. Model 1 takes into account the longitud... An inherent strain method was applied to the welding deformation analysis of left girder of GM’s Buick’s chassis underframe assembly. Three models are used in the calculation. Model 1 takes into account the longitudinal and transverse inherent strains; model 2 considers only longitudinal inherent strain; model 3 also takes into account the longitudinal and transverse inherent strains, but inherent strains are taken according to the function instead of the constant, for simulating the variation of the girder’s stiffness during welding process. The result shows the deformation of model 2 is less than that of the model 1, the error is less than 10% of the absolute displacement. So the longitudinal inherent strain is the main factor determining boxes-girder’s welding deformation. The deformation of model 3 is also less than that of the model 1, because the inherent strains of the model 3 are less than that of the model 1. At last, the welding deformation of the whole underframe was analyzed. The analysis results can be taken as references not only for the choices of welding sequence, welding parameters and fixture’s location, but also for welding deformation prediction of other car chassis. 展开更多
关键词 inherent strain method welding deformation finite element methods
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冲击加载下铝的剪切模量 被引量:14
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作者 胡建波 俞宇颖 +1 位作者 戴诚达 谭华 《物理学报》 SCIE EI CAS CSCD 北大核心 2005年第12期5750-5754,共5页
分别用Steinberg-Cochran-Guinan(SCG)模型、修正的SCG模型和有限应变理论对材料的剪切模量做了数值计算,并与一维平面应变加载下铝的实验结果进行了比较.结果表明,修正的SCG模型与实验结果较为符合.在10—80GPa的压力范围下,剪切模量... 分别用Steinberg-Cochran-Guinan(SCG)模型、修正的SCG模型和有限应变理论对材料的剪切模量做了数值计算,并与一维平面应变加载下铝的实验结果进行了比较.结果表明,修正的SCG模型与实验结果较为符合.在10—80GPa的压力范围下,剪切模量随冲击压力的增加而逐渐增大,这是由于压力的影响占主要地位,发生了加工硬化.在80—125GPa的压力范围下,剪切模量随冲击压力的增大快速减小,这是因为温度的影响比较严重,发生了高温软化现象.剪切模量最终在冲击压力为125GPa处趋于零,这是由于在该压力点冲击熔化发生,剪切强度消失. 展开更多
关键词 剪切模量 Steinberg-Cochran-Guinan模型 有限应变理论
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