7050铝合金T形锻件淬火应力评估
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摘要
针对生产应用中内部应力测试的难度以及成本远高于表面应力测试的现状,开展了7050铝合金T形锻件淬火残余应力的有限元仿真模拟和试验研究,掌握了7050铝合金T形锻件淬火残余应力的分布规律。结合有限元仿真和试验研究,建立构件内部拉应力最大值与表面应力、锻件几何参数等关联的回归方程,采用简化的低次方程来描述构件内部应力特征值。在生产现场,通过对构件进行表面应力测试,结合构件的基本参数建立预测模型,实现构件内部应力特征值的快速评估。结果表明:7050铝合金T形锻件心部最大拉应力对应其筋条区长向最大拉应力,该拉应力受筋条高度、宽度以及翼板厚度的影响。
In view of the difficulty of internal stress measurement and the fact that much higher cost than that of surface stress measurement in production application, the finite element simulation and experimental study of quenching residual stress of 7050 aluminum alloy T-shaped forgings were carried out. The distribution of quenching residual stress of 7050 aluminum alloy T-shaped forgings had been mastered. Based on the finite element simulation and experimental study, the regression equation of the maximum tensile stress and surface stress and geometric parameters of forgings was established. A simplified low order equation was used to describe the internal stress eigenvalues. In the production site, by testing the surface stress of the components and combining the basic parameters of the components, a prediction model was established to realize the rapid evaluation of the internal stress eigenvalues of the components. The results show that, the maximum tensile stress in the center of 7050 aluminum alloy T-shaped forgings corresponds to the maximum tensile stress in the steel bar. The tensile stress is affected by the bar height, width and the thickness of the flange.
In view of the difficulty of internal stress measurement and the fact that much higher cost than that of surface stress measurement in production application, the finite element simulation and experimental study of quenching residual stress of 7050 aluminum alloy T-shaped forgings were carried out. The distribution of quenching residual stress of 7050 aluminum alloy T-shaped forgings had been mastered. Based on the finite element simulation and experimental study, the regression equation of the maximum tensile stress and surface stress and geometric parameters of forgings was established. A simplified low order equation was used to describe the internal stress eigenvalues. In the production site, by testing the surface stress of the components and combining the basic parameters of the components, a prediction model was established to realize the rapid evaluation of the internal stress eigenvalues of the components. The results show that, the maximum tensile stress in the center of 7050 aluminum alloy T-shaped forgings corresponds to the maximum tensile stress in the steel bar. The tensile stress is affected by the bar height, width and the thickness of the flange.
引文
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[2]Hesselbarth H W,Goebel I R.Simulation of recrystallization by cellular automata[J].Acta Metallurgica Materialia,1991,39(9):2135-2143.
[3]Goetz R L,Seethea R V.Modelling dynamic recrystallization using cellular automata[J].Scripta Materialia,1998,38(3):405-413.
[4]肖宏,徐玉辰,闫艳红.考虑晶粒变形动态再结晶过程模拟的元胞自动机法[J].中国机械工程,2005,16(24):2245-2248.
[5]Huang S,Yi Y,Liu C.Simulation of dynamic recrystallization for aluminium alloy 7050 using cellular autom[J].Journal of Central South University of Technology,2009,16(1):18-24.
[6]Mecking H,Kocks U F.Kinetics of flow and strainhardening[J].Acta Metailurgica,1981,29(11):1865-1875.
[7]Ding R,Guo Z X.Coupled quantitative simulation of microstructural evolution and plastic flow during dynamic recrystallization[J].Acta Materialia,2001,49(16):3163-3175.