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叶海潮,秦国华,林锋,左敦稳,吴竹溪,罗育果.基于7075铝厚板铣削加工的初始残余应力释放与再分布模型[J].稀有金属材料与工程(英文),2019,48(1):123~132.[Ye Haichao,Qin Guohua,Lin Feng,Zuo Dunwen,Wu Zhuxi and Luo Yuguo.Model of Release and Redistribution of Initial Residual Stresses for the Milling Process of 7075 Aluminum Alloy Thick Plate[J].Rare Metal Materials and Engineering,2019,48(1):123~132.]
Model of Release and Redistribution of Initial Residual Stresses for the Milling Process of 7075 Aluminum Alloy Thick Plate
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Received:May 02, 2017  Revised:August 08, 2017
DOI:
Key words: 7075 aluminum alloy thick plate  release of residual stresses  redistribution of residual stresses  machining deformation  removal of material
Foundation item:国家自然科学基金(项目号51465045)、江西省主要学科学术和技术带头人资助计划(大型航空整体结构件加工变形的“性能-应力-变形”一体化分析方法)、航空科学基金(项目号2016ZE56011)、江西省自然科学基金(20161BAB206114)资助
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Ye Haichao,Qin Guohua,Lin Feng,Zuo Dunwen,Wu Zhuxi and Luo Yuguo  
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Abstract:
      In the process of manufacturing 7075 aluminimun alloy thick plate, the non homogeneity of plastic deformations and mechanical properties of the material will generate residual stresses. During the following high speed machining process, the release and redistribution of residual stresses are key to deformations of aeronautical monolithic component with the removal of material. Therefore, the study of the analytical method on the residual stress release and redistribution can more clearly understand the evolution mechanism of machining deformation, which is the core link of controlling the machining quality. This is because it is very important for the realization of machining process with high efficiency and precise. Through equaling the removal of materials to the release of residual stresses, the residual stresses remained in the aeronautical monolithic component are converted into the external force according to the static equilibrium conditions, the analysis model is deduced for machining deformations based on the small deformation theory. Because the overall consideration on position variation is done by the tension/compression of neutral surface, bending of neutral surface, and rotation of end surface, the superposition principle can be used to formulize the mechanical model of residual stress redistribution. The proposed analytical model can be suitable for the accurate calculation of the machining deformations of aeronautical monolithic component, in addition to the analysis of the residual stress redistribution. The comparison among the model calculations, the simulated values and the experimental measurement data shows that, both the amplitude and deformation curve, the model calculations are good agreement with the simulated values. Moreover, the measurement error of residual stresses causes the little difference of the amplitude of the model calculations with the experimental measurement data, though the deformation curves of the two have a good agreement with each other.