本文利用DEFORM-3D有限元软件对铝合金镦粗变形过程应变场分布进行了模拟研究，分析不同工艺条件对坯料内部应变场分布的影响，给出应变场分布的规律。模拟结果表明：铝合金内部存在不均匀变形，表面变形小，越靠近中心位置的部分，其应变越大，中心位置点为应变值的最大点。且随变形程度的增大，应变也增大，但不同位置处应变的增大存在差异，表面的应变值增大较不明显，而心部的应变值增大较明显。随后, 采用网格法对坯料内部不同位置处应变进行了测量与计算，对上述数值模拟结果进行了验证,两者基本一致，从而验证了本论文采用的有限元模拟法在分析铝合金镦粗变形过程应变场方面的可行性和可靠性。最后分别用Gaussian函数、柯西-洛伦兹函数以及Voigit函数对模拟得到的高度方向和半径方向中线处应变分布规律进行了拟合，发现镦粗变形过程中的应变分布规律可用Gaussian函数、柯西-洛伦兹函数以及Voigit函数较好地表达。5805
关键词：铝合金；冷镦粗变形；应变场；数值模拟；网格法
Abstract
In this paper, DEFORM-3D finite element software aluminum upsetting deformation strain field distribution in the simulation study, analysis of different process conditions on the blank field distribution of internal strain, strain field given distribution law. The results show that: Aluminum strain at different locations with similar change process, the strain and deformation approximately linear relationship between the degree, and with the increase of deformation, the strain is increased, but at different positions to be variable increases the value of differences. For different positions, the position closer to the central portion of the larger degree of deformation is large, the greater the corresponding strain, the center point of the strain deformation of the aluminum pressure maximum point worth. Subsequently, using the grid method at different locations inside the blank strain were calculated for the numerical simulation results are verified, the two are basically the same, which proves this paper, the finite element method in the analysis of aluminum upsetting deformation strain the feasibility and reliability of the field distribution. Finally respectively Gaussian function, Cauchy - Lorentz function and the function of the analog Voigit the height direction and the width direction compressive strain distribution line fitting, simulation results show that the distribution of the data in accordance with Gaussian function, function of Cauchy-Lorenzcurve and Voigit function, numerical simulation results with high reliability.
Keywords：Aluminum alloy; Cold upsetting deformation; Strain field; Numerical Simulation; Grid method
目录
1绪论    1
1.1铝合金简介    1
1.1.1基本信息    1
1.1.2铝合金的金属特点    1
1.1.3铝合金的分类    2
1.2圆柱形坯料冷镦粗工艺    3
1.3 数值模拟技术在金属塑性变形过程中的优越性    4
1.4网格法测量应变中的应用    5
1.5 选题的目的和意义    6
1.6本课题的研究内容    6
2有限元数值模拟及DEFORM简介    8
2.1 引言    8
2.2有限元计算方法    8
2.3 DEFORM简介与特点    8
2.3.1 DEFORM软件简介    8
2.3.2 DEFORM的特点    9
2.4 DEFORM软件操作流程    10
2.5 DEFORM-3D 在冷镦方向应用    11
3铝合金镦粗变形过程应变场分布的研究    13
3.1 引言    13
3.2 建立有限元模型    13
3.3 数值模拟结果及分析    16 有限元铝合金镦粗变形过程应变场分布的研究模拟:http://www.youerw.com/cailiao/lunwen_2998.html