Determination of the Field of Local Displacements by the Digital Speckle Correlation Method with Adaptive Segmentation of the Images

Sakharuk, О. М.; Muravs’kyi, L. I.; Holyns’kyi, I. S.; Lychak, Oleh

doi:10.1007/s11003-014-9660-4

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…It is widely used as a powerful and flexible tool for determining surface strain in the experimental mechanics of a deformed solid body. It provides a wide field for the determination of displacements and strain in the measurement area thanks to its comparison of digital images of the sample surface in undeformed and deformed states [ 12 , 13 ]. This optical method is based on digital processing according to the appropriate algorithm of several images of the sample surface, which are obtained with known values of the load force using a camera [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

A New Energy Approach to Predicting Fracture Resistance in Metals

et al. 2023

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To ensure the reliability and durability of structural elements, modern approaches require data characterizing the local stress-strain state of the material in risk zones. In order to predict the fracture resistance of structural elements, a theoretical-experimental method based on the damage accumulation model using the energy approach is proposed. One of the unique characteristics of the proposed approach is that it uses local parameters of the stress-strain state, which are determined using a highly accurate and easy-to-use noncontact method of optical–digital image correlation (ODIC). This can be used both in laboratory conditions and for structural elements under real operating conditions. The proposed method of plotting stress–strain curves makes it possible to determine the true stresses near the concentrators in structural elements under a complex load. Using these diagrams in calculations and the finite element method (FEM), a study of local strain not only of the surface, but also of the internal volumes of the material was carried out. The damage parameter is introduced as the ratio of the elastoplastic strain energy of the local volume to its critical value. It is confirmed that the damage of the sample material starts from its centre. It was established that the damage parameter in the centre of the sample is 25–35% higher than its value on the surface of the sample.

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Section: Introductionmentioning

confidence: 99%

A New Energy Approach to Predicting Fracture Resistance in Metals

et al. 2023

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“…For instance, Benaboud et al [2] identified different fatigue stages of asphalt concrete under bending loads using the evolution of acoustic emission activity over time. Sakharuk et al [3] proposed a rough surface image adaptive digital speckle method to measure the surface displacement field of hard aluminum beams with transverse fatigue cracks under threepoint loading. Zhang et al [4] conducted uniaxial compression tests on cement specimens.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Relationship between Compression Stability and Deformation Localization of Viscous/Brittle Rock‐Like Materials

Yang

Chen

et al. 2021

Advances in Materials Science and Engineering

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Rock-like materials often exhibit irregular failure deformation under long-term service conditions, and the deformation and failure of asphalt and concrete materials is a serious problem that leads to subgrade failure. In this study, two different viscous/brittle rock-like materials were prepared by the in situ loading and optical speckle synchronous monitoring test method, and the evolution characteristics of the deformation field were studied during compression. The formation process of the compression deformation localization of rock-like materials and their relationship with stability were analyzed. A quantitative description of the compression deformation stage and localization characteristics of the viscous/brittle rock-like materials is presented. The results can be summarized as follows. At the initial stage of compression, the deformation localization zone of viscous/brittle rock-like materials begins to expand from the middle area to the surrounding area. Preliminary results of the deformation localization of the linear elastic deformation stage were obtained. The failure cloud image is completely formed at the peak, which is consistent with the failure physical map. The deformation process of compression can be quantitatively described using the deformation localization characteristics of rock-like materials.

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