Novel Speckle Preparation and Heat Insulation Method for DIC Strain Measurement at Cryogenic Temperature and Large Deformation Environment

IF 2 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics Pub Date : 2023-10-25 DOI:10.1007/s11340-023-01006-0

J. Yang, Y. Li, J. Deng, Z. Zhang, J. Zhou, X. Zhang

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引用次数: 0

Abstract

Background

The accuracy and reliability of digital image correlation (DIC) technologies are not only dependent on correlation algorithms but also strongly affected by the quality of the speckle patterns, especially under extremely low temperatures and large deformation conditions.

Objective

To overcome the challenge that the speckle patterns become more brittle and harder in the extremely low temperature experiments near liquid helium, and speckles cracking and shedding during the large deformation processes.

Methods

Novel speckle patterns and fabrication technologies have been developed specifically tailored to extremely low temperatures and large deformation conditions.

Results

A novel spinning-coated speckle fabrication method based on PDMS silicone and TiO₂ spherical particles was proposed, which can enable extremely low temperatures of DIC measurements above 20% strain. Using the 316LN stainless steel as a sample, the performances of several common speckles have been compared, and the strain localization and propagation had also been clarified.

Conclusions

The novel DIC full-field measurement method was validated with 316LN stainless steel, which confirmed that the speckles have excellent stability in the process of large deformation at extremely low temperatures. In addition, the formation and propagation processes of the slip bands for 316LN stainless steel have been revealed.

Abstract Image

查看原文本刊更多论文

用于低温和大变形环境下 DIC 应变测量的新型斑点制备和隔热方法

背景数字图像相关（DIC）技术的准确性和可靠性不仅取决于相关算法，还受到斑点图案质量的强烈影响，尤其是在极低温和大变形条件下。结果提出了一种基于 PDMS 硅胶和 TiO2 球形颗粒的新型纺丝涂层斑点制作方法，该方法可实现 20% 应变以上的超低温 DIC 测量。以 316LN 不锈钢为样品，比较了几种常见斑点的性能，并阐明了应变的定位和传播。结论利用 316LN 不锈钢验证了新型 DIC 全场测量方法，证实斑点在极低温度下的大变形过程中具有出色的稳定性。此外，还揭示了 316LN 不锈钢滑移带的形成和传播过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Mechanics 物理-材料科学：表征与测试

CiteScore

4.40

自引率

16.70%

发文量

111

审稿时长

3 months

期刊介绍： Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.