Measuring true stress–strain curves of cylindrical bar samples with mirror‐assisted multi‐view digital image correlation

IF 1.8 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strain Pub Date : 2021-11-02 DOI:10.1111/str.12403

Bin Chen, B. Pan

引用次数: 7

Abstract

This paper proposes to measure true stress–strain curves at the necking region of cylindrical bar samples by using an advanced mirror‐assisted multi‐view digital image correlation (MV–DIC) technique. The mirror‐assisted MV–DIC can measure the panoramic shape and deformation fields of a cylindrical bar sample with only a single two‐camera stereo‐DIC system and two planar mirrors. The measured panoramic shape enables accurate determination of the cross‐section area and radius of curvature at the necking region by using cylindrical or torus fitting. The retrieved cross‐section area and radius of curvature at the necking region further enable the measurement of the true stress–strain curves and even the Bridgman's correction of the true stress.

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用镜面辅助的多视点数字图像相关技术测量圆柱杆样品的真应力-应变曲线

本文提出使用先进的镜像辅助多视图数字图像相关（MV–DIC）技术测量圆柱形棒材样品颈缩区域的真实应力-应变曲线。反射镜辅助的MV–DIC可以测量圆柱形条形样品的全景形状和变形场，只需一个双摄像头立体DIC系统和两个平面反射镜。测量的全景形状能够通过使用圆柱形或环面拟合准确确定颈缩区域的横截面积和曲率半径。颈缩区域的检索横截面积和曲率半径进一步使得能够测量真实应力-应变曲线，甚至能够对真实应力进行Bridgman校正。

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

Strain 工程技术-材料科学：表征与测试

CiteScore

4.10

自引率

4.80%

发文量

期刊介绍： Strain is an international journal that contains contributions from leading-edge research on the measurement of the mechanical behaviour of structures and systems. Strain only accepts contributions with sufficient novelty in the design, implementation, and/or validation of experimental methodologies to characterize materials, structures, and systems; i.e. contributions that are limited to the application of established methodologies are outside of the scope of the journal. The journal includes papers from all engineering disciplines that deal with material behaviour and degradation under load, structural design and measurement techniques. Although the thrust of the journal is experimental, numerical simulations and validation are included in the coverage. Strain welcomes papers that deal with novel work in the following areas: experimental techniques non-destructive evaluation techniques numerical analysis, simulation and validation residual stress measurement techniques design of composite structures and components impact behaviour of materials and structures signal and image processing transducer and sensor design structural health monitoring biomechanics extreme environment micro- and nano-scale testing method.