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  • Open Access


    Fine Characterization and Analysis of Drying Strain of the ELM Board via DIC Technology

    Yuanchu Liu, Xiaodong Zhu, Zhengmin Jin, Yingying Liu, Qingjian Wei, Bonan Liang, Yingchun Cai*, Jingyao Zhao*

    Journal of Renewable Materials, Vol.11, No.2, pp. 567-580, 2023, DOI:10.32604/jrm.2022.023037

    Abstract In this paper, the occurrence and development mechanism of strain on the cross-section during the wood drying is explored. Therefore, strain regularity on the cross-section of 50 mm thickness elm (Ulmus rubra) board at the temperature of 40°C and 80°C is detected via digital image correlation technology. Hence, the difference between tangential and radial strain at surface and core layers was denoted. The results showed that strain distribution in the width direction of the board is uneven. Moreover, a large drying shrinkage strain occurs at the near-core layer, while the maximum strain difference reaches 4.08%. Hence, the surface of the… More > Graphic Abstract

    Fine Characterization and Analysis of Drying Strain of the ELM Board via DIC Technology

  • Open Access


    A Method for Measuring Displacement and Strain of Rubber Sheets with Large Deformation Using Digital Image Correlation

    Kengo Fujii1, Satoru Yoneyama1, Ayaka Suzuki2, Hiroshi Yamada2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 21-21, 2021, DOI:10.32604/icces.2021.08538

    Abstract This study establishes a method to measure the displacement and strain of rubber with large and fast deformations using digital image correlation. In order to elucidate the mechanism of growth of a crack and to investigate the complex behavior of a crack tip, which is important for that purpose, displacement and strain near the crack where large strains are locally generated by stress concentration are measured. A displacement restraint rubber sheet of a strip fixed at upper and lower ends with an initial crack is used as a test piece. A constant rate displacement load is applied to it, its… More >

  • Open Access


    Influence of Aspect Ratio on Rolling Shear Properties of Fast-Grown Small Diameter Eucalyptus Lumber

    Tao Gui1, Shichen Cai1, Zhiqiang Wang1,*, Jianhui Zhou2,*

    Journal of Renewable Materials, Vol.8, No.9, pp. 1053-1066, 2020, DOI:10.32604/jrm.2020.011645

    Abstract Eucalyptus is a major fast-grown species in South China, which has the potential for producing structural wood products such as cross-laminated timber (CLT). Aspect ratio (board width vs. board thickness) of eucalyptus lumbers is small due to the small diameter of fast-grown eucalyptus wood. To evaluate its rolling shear modulus and strength for potential CLT applications, three-layer hybrid CLT shear block specimens with different aspect ratios (2,4,6), were tested by planar shear test method. Digital image correlation (DIC) was employed to measure the rolling shear strain distribution and development during the planar shear tests. The mean values of rolling shear… More >

  • Open Access


    Coupled Digital Image Correlation and Peridynamics for Full-Field Deformation Measurement and Local Damage Prediction

    Tianyi Li1, Xin Gu1, Qing Zhang1,*, Dong Lei1

    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 425-444, 2019, DOI:10.32604/cmes.2019.06700

    Abstract Digital image correlation (DIC) measurement technique and peridynamics (PD) method have been applied in specific fields extensively owing to their respective advantages in obtaining full-field deformation and local failure of loaded materials and structures. This study provides a simple way to couple DIC measurements with PD simulations, which can circumvent the difficulties of DIC in dealing with discontinuous deformations. Taking the failure analysis of a compact tension specimen of aluminum alloy and a static three-point bending concrete beam as examples, the DIC experimental system firstly measures the full-field displacements, and then the PD simulation is applied on potential damage regions… More >

  • Open Access


    Quasi-static studies of deformation, fracture and mechanical properties of a PBX simulant using digital image correlation method

    Zhongbin Zhou, Pengwan Chen, Fenglei Huang

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 125-126, 2011, DOI:10.3970/icces.2011.017.125

    Abstract The macroscopic deformation and fracture behavior of a polymer bonded explosive (PBX) simulation material were studied by using Digital Image Correlation (DIC) method. The Brazilian test, semi-circular bending test, punch loading and uniaxial loading experiments were chosen for the study. The whole displacement and strain fields were obtained by using DIC method at macro-scale. New sights into fracture processes and failure mechanisms of simulant samples under different quasi-static loading conditions have been obtained. Macro studies show that the experimental results are in agreement with the theoretical analysis. The experimental methods combined with DIC technique have broad applicability to deformation and… More >

  • Open Access


    Mesh based digital image correlation method using 8-node isoparametric element

    Zhao Zilong, Ma Shaopeng, Wang Xian

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 113-114, 2011, DOI:10.3970/icces.2011.017.113

    Abstract As one of the most important photomechanics experimental methods, digital image correlation (DIC) has been widely used in various areas for displacement and deformation field measurement. The main idea of DIC is to resolve the displacement of speckle patterns by independently matching the corresponding patterns on reference and deformed speckle images. In order to add the continuity between the matching of the adjacent patterns, the mesh based DIC (abbreviated mesh-DIC hereafter), in which the whole image are matched, is proposed by Sun, et al. In mesh-DIC, the whole displacement field is characterized by a mesh which is constructed by 4-node… More >

  • Open Access


    High-speed 3-Dimensional Digital Image Correlation System and Its Application to the Measurement of High Speed Projectile

    Zeng Xiangfu, Ma Shaopeng, Ma Qinwei, Chen Pengwan

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 111-112, 2011, DOI:10.3970/icces.2011.017.111

    Abstract In order to measure the attitude parameters of the projectile, a high-speed 3-dimensional digital image correlation (H3D-DIC) system is designed and constructed. In the H3D-DIC system, two high-speed cameras are used to capture the images of the projectile from two different directions and the 3-dimensional coordinates of the markers painted on projectile are obtained by processing the images using stereovision techniques. Because of the difference on the resolution of the two cameras, the images captured are with different magnification. Therefore, a new correlation program, in which the parameter of pixel size is also included in the correlation schedule, is designed… More >

  • Open Access


    High Temperature and High Speed Digital Image Correlation Method for Dynamical Measurement of Thermal Shock

    Xue Feng*, Xiang Wang, Guobing Zhang, Huimin Xie, Helong Yu

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 115-116, 2011, DOI:10.3970/icces.2011.020.115

    Abstract Most ceramic materials, because of their inherent brittleness, are susceptible to catastrophic failure under conditions of thermal shock. A novel method for measuring the dynamical deformation is proposed by using of high speed digital image correlation in high temperature environment. The nature texture of ceramic materials can be used as speckle while filters and monochrome produced by LED are applied to suppress black-body radiation and enhance the luminous intensity.

    The light from the heated material can alter the Grayscale of material surface and the recognition for material surface will become more and more difficult with the temperature increase. In… More >

  • Open Access


    A new system for measuring residual stress by using 3D digital image correlation techniques

    Zhenxing Hu, Huimin Xie, Jian Lu

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.2, pp. 57-59, 2011, DOI:10.3970/icces.2011.020.057

    Abstract Residual stress plays an important role in structural and material manufacturing. Measurement techniques of residual stress can be neatly divided into destructive and non-destructive ones. The destructive techniques are dependent on inferring the original stress from the displacement incurred by completely or partially relieving the stress by removing material. The hole drilling method for residual stress measurement is a destructive method and was first introduced in the 1930s by Mathar. In recent years, the hole drilling method for evaluating residual deformation has been implemented with optical method such as holographic interferometry, electronic speckle pattern interferometry, digital image correlation (DIC), and… More >

  • Open Access


    Study on the Shear Properties of 3D Woven C/C Composites by Developed Digital Image Correlation Technique

    L. J. Qin1, X.F. Li1, X.G. Yang2, Z.W. Zhang2, Z. H. Feng2, H. Miao1, Y. Wang1, L.H. He1, X.L. Gong1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.018.003

    Abstract Three-dimensional (3D) woven carbon/carbon (C/C) composites have attracted considerable attention in recent years. In comparison to the laminated composites, the carbon composites show better merit due to their strong through-the-thickness properties, high damage tolerance, and dimensional stability. However, the deformation of these materials is usually non-uniform. The strain field distribution is highly dependent on the heterogeneity of 3D woven structure. Therefore, the traditional techniques such as strain gauge are not suitable for measuring the deformation.

    In this presentation, a full-field digital image correlation (DIC) technique was developed. The Iosipescu shear test (v-notched beam test) was employed to load the… More >

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