ANSYS金属薄板双向拉伸试验及数值仿真研究

摘要材料成形极限对于材料加工成形具有极为重要作用，而加载路径对材料成形极限有很大影响。本文采用双轴十字拉伸试验，通过图像相关方法获得了十字型试样拉伸实时应变场数据，得到复杂应力路径下成形极限。为工程应用提供了更有利参考。本文研究内容如下；77276

1）采用中间减薄模型及边角圆弧过度的十字双轴拉伸试样，解决十字试样臂上先破坏和边角应力集中的问题。

2）通过图像数字相关方法实时观察试样拉伸应变场，获得整个拉伸过程中的应变时间历程，处理获得到材料力学性能参数。通过改变加载速率，双轴拉伸速率比和预应变获得双轴拉伸试样成形极限变化规律。

3）利用 ANSYS Workbench 数值模拟单轴和双轴拉伸下的应变规律。研究结果表明，不同工况下极限应变变化趋势数值仿真与试验结果相一致。

毕业论文关键词双轴拉伸成形极限复杂应变路径有限元模拟图像数字相关

毕业设计说明书外文摘要

Title Experiment and Numerical Simulation Research on the biaxial tension test of sheet metal。

Abstract Material forming limit has very important influence on materials' processing and forming 。And the different loading paths also influence a lot on the material forming limit。 The biaxial test in this paper got the forming limit strain by using the method of DIC(Digital image correlation)。The FLD obtained from the test can effectively direct the actual process。 The main research contents and conclusions of this paper are as follows。

1)The specimen for cross biaxial test was designed。 Filleting the edge of the thinned area and the cross region to solve the problem of stress concentration。

2)The change of the strain field was observed by the method of DIC and The complex strain paths were obtained by changing the loading velocity, biaxial rate ratio and making a pre-deformation。

3)The biaxial and uniaxial tension test were simulated by FEM。 And The trend of FLD from the simulating method fitted to the test data。

Keywords Biaxial test Forming limit Complex strain paths FEM DIC

本科毕业设计说明书第 I 页

1 绪论 1

1。1 引言 1

1。2 铝合金材料介绍 1

2 相关概念介绍 2

2。1 材料成形极限的介绍 2

2。2 测量应变方法 4

2。3 应变路径对铝合金材料力学性能影响 6

2。4 研究内容 7

2。5 本章小结 7

3 实验设备以及方案 8

3。1 实验设备介绍 8

3。2 试验试样介绍 10

3。3 实验方案设计 13

3。4 ANSYS金属薄板双向拉伸试验及数值仿真研究:http://www.youerw.com/wuli/lunwen_88793.html