柔性复合薄膜成形极限曲线的视觉测定方法

陈仁虹; 梁晋; 叶美图; 任茂栋; 张继耀

doi:10.37188/CO.2021-0101

Volume 15 Issue 1

Jan. 2022

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Article Contents

Chinese Optics > 2022 > 15(1): 22-33.

CHEN Ren-hong, LIANG Jin, YE Mei-tu, REN Mao-dong, ZHANG Ji-yao. Visual method for measuring forming limit curve of pliable composite film[J]. Chinese Optics, 2022, 15(1): 22-33. doi: 10.37188/CO.2021-0101

Citation:

CHEN Ren-hong, LIANG Jin, YE Mei-tu, REN Mao-dong, ZHANG Ji-yao. Visual method for measuring forming limit curve of pliable composite film[J]. Chinese Optics, 2022, 15(1): 22-33. doi: 10.37188/CO.2021-0101

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Visual method for measuring forming limit curve of pliable composite film

doi: 10.37188/CO.2021-0101

CHEN Ren-hong^{1, 2
,},
LIANG Jin^{1
,
,},
YE Mei-tu^{1, 2},
REN Mao-dong²,
ZHANG Ji-yao^{1, 2}

1.
State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2.
Innovation Lab, XTOP 3D Technology (Shenzhen)Co. Ltd., Shenzhen 518060, China

Funds: Supported by National Natural Science Foundation of China (No. 51865057)

More Information

Corresponding author: liangjin@mail.xjtu.edu.cn
Received Date: 06 May 2021
Rev Recd Date: 18 Jun 2021

Available Online: 17 Aug 2021

Publish Date: 19 Jan 2022

Abstract

Abstract

To address the difficulty in measuring the strain limit of pliable composite film forming tests, a measurement method based on binocular stereo vision combined with digital image correlation is proposed. Firstly, to address the image matching problem in large deformations or cracks in thin films, a weak-correlation step-by-step matching method based on adaptive updating of image matching benchmarks is proposed according to the continuity of adjacent state deformation of series images. Then, according to the differences in the surface strain distribution of the film material with that of the steel parts, a strain field is proposed to fit the limit strain curve of the film material. The software and hardware system of visual measurement is built, and the limit strain curve of a Q235 steel specimen is measured and compared to results from the coordinate grid method. The limit strain accuracy can be improved by 0.02%, which proves the feasibility and accuracy of this method. The pliable composite film specimens prepared by PET, Nylon, Al foil, PP were each measured. The method and system successfully completed the measurement of the forming limit curve of the pliable composite film. The comparative experiments show that the proposed method can quickly and accurately measure the surface strain distribution of pliable composite film during forming. Compared with the coordinate grid method, it has obvious advantages and provides a highly reliable and highly precise method for solving the forming limit strain curve of film materials.
- pliable composite film,
- forming limit strain,
- visual measurement,
- image step-by-step matching

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References(18)

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