Measurement of deformations for copper/aluminum clad under tension with digital speckle correlation

SUN Tao; LIANG Jin; CAI Yong; WANG Yi-qing

doi:10.3788/OPE.20122012.2599

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Measurement of deformations for copper/aluminum clad under tension with digital speckle correlation

更新时间：2020-08-13

- Measurement of deformations for copper/aluminum clad under tension with digital speckle correlation
- Optics and Precision Engineering Vol. 20, Issue 12, Pages: 2599-2606(2012)
- 作者机构：
  
  1. 西安交通大学机械工程学院,陕西西安 710049
  2. 四川工程职业技术学院机电工程系,四川德阳,618000
  3. 西南科技大学制造科学与工程学院,四川绵阳,621010
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122012.2599
  CLC： TG83;O436.1
- Received：19 June 2012，
  
  Revised：30 August 2012，
  
  Published：10 December 2012
- 稿件说明：
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孙涛, 梁晋, 蔡勇, 王伊卿. 用数字散斑法测量铜/铝复层板拉伸变形[J]. 光学精密工程, 2012,20(12): 2599-2606

SUN Tao, LIANG Jin, CAI Yong, WANG Yi-qing. Measurement of deformations for copper/aluminum clad under tension with digital speckle correlation[J]. Editorial Office of Optics and Precision Engineering, 2012,20(12): 2599-2606
孙涛, 梁晋, 蔡勇, 王伊卿. 用数字散斑法测量铜/铝复层板拉伸变形[J]. 光学精密工程, 2012,20(12): 2599-2606 DOI： 10.3788/OPE.20122012.2599.

SUN Tao, LIANG Jin, CAI Yong, WANG Yi-qing. Measurement of deformations for copper/aluminum clad under tension with digital speckle correlation[J]. Editorial Office of Optics and Precision Engineering, 2012,20(12): 2599-2606 DOI： 10.3788/OPE.20122012.2599.

摘要

提出了一种基于数字散斑相关法和双目立体视觉技术的全场三维变形测量方法

实现了对爆炸焊接制备的铜/铝复层材料的变形测量。研究了该方法所涉及的数字散斑相关算法、三维坐标、位移和应变计算等关键技术

借助于VC++6.0开发环境

研制并开发了用于铜/铝复层板全场变形测量的试验系统及其软件。为了验证本文所述测量方法的可行性

进行了精度验证实验和铜/铝复层板单向拉伸试验

且对复层板拉伸试验结果与有限元软件Abaqus数值模拟结果进行了对比分析。结果表明:本文方法的应变测量精度优于0.5%

与引伸计测得的结果基本相当;测得的应变极值分布与有限元模拟结果很吻合;在板料发生颈缩前

塑性应力-应变模拟曲线与试验结果很吻合;整个变形过程中位移-载荷模拟曲线的变化趋势与试验结果一致

模拟得到的极限载荷的相对误差为0.06%～2.25%。实验结果说明

数字散斑方法是一种精确获得复层板料全场应变的有效手段。

Abstract

To measure the deformation of copper/aluminum clad metals made by explosive welding technique

a new full-field three-dimensional deformation measurement method based on the digital speckle correlation method and binocular stereovision was proposed and implemented. The related key technologies including image correlation matching

three-dimensional coordinates

displacement and strain reconstruction were investigated.Then a deformation measurement system and corresponding software were developed based on the VC++6.0 platform. To validate the feasibility of the proposed method

a precision test and a copper/aluminum clad tensile test were conducted

and the experimental data of the test and the numerical simulation using Abaqus software were compared. Experimental results show that the accuracy of strain measurement is not lower than 0.5%

very close to that of the extensometer. The extreme strain distribution based on digital speckle correlation method is coincident with that the finite element simulation well. Furthermore

the simulated curves of plastic stress-strain are in agreement with the experimental data before necking the sheet metal

and the tendency of simulated curves of displacement-load is consistent with the experimental data in the whole tensile processes. Moreover

the relative errors of simulated ultimate load are from 0.06% to 2.25%. It demonstrates that the digital speckle correlation method is an effective tool to obtain the full-field strain of sheets accurately.

关键词

Keywords

references

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