数字图像相关技术在土工格栅宽幅拉伸试验中的应用

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Wooseok Shin, Chungsik Yoo
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引用次数: 0

摘要

本文旨在探讨用于土工格栅宽幅拉伸试验的 DIC 技术,从试样制备到分析所需的 DIC 参数选择,为正确使用提供指导。对 PET 土工格栅进行了一系列单调加载的宽幅拉伸试验,以研究试样表面制备方法和用户定义的 DIC 参数的影响。另外还进行了一组循环加载测试,以研究图像采样率的影响。结果表明,斑点模式(图像纹理)对 DIC 结果有显著影响,斑点尺寸越大,不确定性水平越高,最终导致计算应变的不均匀性增加。此外,研究还发现,如果子集尺寸小于最佳尺寸(通常为 20-30 像素),则会导致应变分布高度局部化。步长也有类似的趋势。此外,还发现图像采样率对 DIC 计算的循环应变有显著影响,即图像采样率越低,计算的循环应变越小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of the digital image correlation technique in wide width tensile test of geogrids

This paper aims to explore the DIC technique for use in wide width tensile testing of geogrids, from specimen preparation to selection of DIC parameters required for analysis to provide a guide for a proper use. A series of monotonically loaded wide width tensile tests were conducted on a PET geogrid to investigate the effects of specimen surface preparation methods and the user-defined DIC parameters. An additional set of tests under cyclic loading was conducted to investigate the effect of the image sampling rate. The results indicate that the speckle pattern (image texture) has a significant effect on the DIC results such that the larger is the speckle size, the greater is the uncertainty level, eventually leading to increased nonuniformity in the calculated strains. Also, it was revealed that a subset size smaller than optimal, typically 20–30 pixels, results in highly localized strain distribution. A similar trend was observed in step size. In addition, the image sampling rate was found to have a significant effect on the DIC-calculated cyclic strains, such that the lower is the image sampling rate, the lower is the calculated cyclic strain.

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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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