3D Deformation Measurement of Soft Material under Indentation Using Improved Diffraction-Assisted Image Correlation
3D Deformation Measurement of Soft Material under Indentation Using Improved Diffraction-Assisted Image Correlation
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DOI：
10.1007/s11340-017-0326-7
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发表时间：
2017
影响因子：
2.4
通讯作者：
J. Dong;Zhanwei Liu;J. Gao
中科院分区：
文献类型：
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作者：
J. Dong;Zhanwei Liu;J. Gao
在基于有限元的反分析中，完整的实验数据收集对于各种材料的多参数识别和物理建模至关重要。本文对衍射辅助图像相关法进行了改进，提出了一种无盲区的软材料压痕变形测量方法。提出了一种简单方便的基于图像的三维标定方法，推导了基于更严格成像模型的三维位移测量公式。使用改进的DAIC，一个新开发的成像装置与压头固定加载和无盲区的建议，允许三维位移的整个上表面的软硅胶试样被检索。实验结果表明，该方法是一种结构简单、准确、高效、方便的三维压痕变形测量工具，能够满足现场测量（高集成度）和动态测量（同步立体图像采集）等坚韧的压痕变形测量要求。
In inverse finite element-based analysis, complete experimental data collection is critical for multi-parameter identification and physical modeling of all kinds of materials. In this paper, diffraction-assisted image correlation (DAIC) is improved and proposed for the deformation measurement of a soft material under indentation with no blind area. A simple and convenient image-based 3D calibration method was developed, and more accurate formulations for 3D displacement measurement based on a more rigorous imaging model were derived. Using the improved DAIC, a newly developed imaging device with indenter-fixed loading and no blind area is proposed that allows 3D displacements of the whole upper surface of a soft silica gel specimen to be retrieved. The experimental results demonstrate that the proposed method is an accurate, efficient and convenient tool with a simple structure for 3D indentation deformation measurement and illustrate its capabilities to capture deformation in indentation tests with tough testing requirements, such as in situ measurement with limited access (high integration level) and dynamic testing (capturing of synchronously stereo images).