On the use of stereo‐digital image correlation for the alignment of a fatigue testing machine in accordance with international standards: A feasibility study

IF 1.8 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strain Pub Date : 2021-05-17 DOI:10.1111/str.12382

J. M. García, Marie-Thérèse Auclair, T. Morgeneyer

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引用次数: 1

Abstract

Stereo‐digital image correlation (SDIC) is used for the analysis and quantification of parasite bending stresses in a fatigue specimen due to its mounting in a misaligned load frame. The aim of this work is to provide an easy way to estimate the induced parasite bending stresses due to the load frame misalignment, using the out‐of‐plane displacement measurements obtained by SDIC and beam theory. Analytical solutions of parasite stresses as a function of out‐of‐plane misalignments are provided for flat fatigue specimens having (a) tangentially blending fillets between the uniform test section and the ends and (b) continuous radius between the ends. Simple procedures for aligning a commercial load frame in accordance with international standards are also provided. The bending stresses profile along the specimen main axis obtained by numerical simulations have shown a very good agreement with the results obtained by the analytical models. The proposed methodology could complement standard alignment techniques based on samples instrumented with strain gauges or, in their absence, even replace established procedures.

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根据国际标准，使用立体数字图像相关对疲劳试验机进行校准：可行性研究

立体数字图像相关（SDIC）用于分析和量化疲劳试样中由于安装在未对准的载荷框架中而产生的寄生弯曲应力。这项工作的目的是使用SDIC和梁理论获得的平面外位移测量值，提供一种简单的方法来估计由于载荷框架未对准而引起的寄生弯曲应力。对于具有（a）均匀试验段和端部之间切向混合圆角和（b）端部之间连续半径的平面疲劳试样，提供了作为平面外未对准函数的寄生应力的分析解。还提供了根据国际标准对准商业负载框架的简单程序。通过数值模拟获得的沿试样主轴的弯曲应力分布与分析模型获得的结果非常一致。所提出的方法可以补充基于装有应变仪的样品的标准比对技术，或者在没有应变仪的情况下，甚至可以取代既定程序。

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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.