Article
Chemistry, Multidisciplinary
Tomas Vaitkunas, Paulius Griskevicius, Adi Adumitroaie
Summary: Digital image correlation is an experimental method for measuring displacement and strain without contact, which involves tracking surface subsets, processing digital images, and numerical computation. This study analyzes the advantages of an algorithm based on peridynamics theory and compares strain calculation with traditional methods.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Hai -Ling Shi, Thomas Rougelot, Shou-Yi Xie, Jian-Fu Shao, Minh-Ngoc Vu, Jean Talandier
Summary: The influences of resaturation processes in claystone were investigated using X-ray microtomography and Digital Volume Correlation. The results indicate that these processes have a significant impact on the mechanical properties of claystone at the sample scale.
Article
Engineering, Geological
H. L. Shi, T. Rougelot, S. Y. Xie, J. F. Shao, J. Talandier
Summary: The objective of this study is to investigate the deformation behavior of anisotropic claystone in relation to material heterogeneity. Five triaxial compression tests were conducted on Callovo-Oxfordian claystone samples under in-situ X-ray micro-tomography monitoring. Complete 3D images of the samples' full loading history were analyzed, and non-uniform strain fields were determined. The study focused on the effects of bedding planes, initial cracks, and confining stress on strain fields, and found that the structural anisotropy and confining pressure have a strong influence on strain distribution and cracking process.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Optics
Xiaofeng Yan, Jinwei Guan, Kang Wei, Rui Zhang, Li Guo
Summary: In this study, a hybrid computational and experimental mechanics method based on peridynamics and DIC technique is proposed for measuring the full-field rigid body rotation and strain. The method utilizes a DIC-based PD model to derive calculation formulas for rigid body rotation and strain, which are mutually insensitive and independent. The proposed method is able to accurately calculate rotation and strain in the presence of simultaneous rigid body rotation and deformation.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Giulia Cavazzoni, Luca Cristofolini, Enrico Dall'Ara, Marco Palanca
Summary: Measurement uncertainties of Digital Volume Correlation (DVC) are influenced by various factors, but the effect of highly heterogeneous trabecular microstructures is still unknown. In this study, metastatic and healthy vertebral bodies were scanned and their bone microstructural parameters were calculated. The results showed that the heterogenous trabecular microstructure only weakly affects the measurement uncertainties of DVC, with Structure Separation being weakly correlated to the standard deviation of the error (SDER). The spatial distribution of the strain measurement uncertainties seemed to be associated with regions with reduced greyscale gradient variation in the microCT images. Therefore, measurement uncertainties should be assessed in each single application of DVC to consider the minimum unavoidable uncertainty.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Geological
Lingtao Mao, Haizhou Liu, Yu Lei, Jingcheng Wu, Yang Ju, Fu-Pen Chiang
Summary: The study compares the accuracy and precision of subset-based L-DVC and finite-element-based G-DVC approaches for five rocks, discussing the two important factors affecting accuracy, namely element/subset size and microstructure. The results show that performance of G-DVC is better than that of L-DVC, albeit at the expense of computational efficiency, especially for smaller subset sizes. An indentation test on red sandstone further demonstrates the feasibility of the two methods. This study aims to supplement the lack of research on the two DVC approaches for rocks and provides a reference for subsequent related research.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Ana Vrgoc, Zvonimir Tomicevic, Benjamin Smaniotto, Francois Hild
Summary: The results of in-situ cyclic tensile experiments on glass fiber mat reinforced polyester resin dogbone specimens were analyzed using X-ray Computed Tomography and Digital Volume Correlation. Both specimens failed at equal stress levels, indicating the notch insensitivity of the material. Strain and damage analysis showed the development of inner strained bands in both specimens, even in the first loading cycle, indicating the path to final fracture. The study concludes that the final failure of the material was primarily driven by the yarn mesostructure.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Composites
Ana Vrgoc, Zvonimir Tomicevic, Benjamin Smaniotto, Francois Hild
Summary: In-situ assessment of strain and damage distributions in a dogbone specimen with a rectangular notch was conducted using X-ray computed tomography and digital volume correlation. The specimen, made of continuous glass fiber mat reinforced polyester resin composite plate, was cyclically tensile loaded. The strain-damage interplay was evaluated through analysis of major eigen strain and correlation residual fields. A strained band formed at the notch root and led to final failure. The first cracks did not initiate at the notched region despite high strain gradients. Statistical analysis showed higher standard deviations of major eigen strain distributions in the remaining part of the specimen compared to the notched region.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Xiaocen Duan, Jianyong Huang
Summary: With the rapid development of 3D volume imaging technology, digital volume correlation (DVC) has become an indispensable tool in various engineering fields. In this study, a novel deep learning-based DVC methodology called DVC-Net is proposed to achieve accurate and efficient 3D deformation analysis. The method consists of three sub-networks for different tasks, including integer-voxel searching, sub-voxel registration, and displacement field denoising. The DVC-Net reduces computational complexity and is suitable for practical problems such as changes in lighting conditions or noisy images.
EXTREME MECHANICS LETTERS
(2022)
Article
Engineering, Multidisciplinary
Rong Wu, Shili Zhao, Yi Liu, Shuiqiang Zhang
Summary: A full-field stereo digital image correlation (DIC) strain measurement method was proposed to address the poor accuracy under large rotations, by introducing rotation matrices to eliminate strain errors. The accuracy and effectiveness of the method were confirmed through numerical simulations and experiments.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
J. P. M. Hoefnagels, K. van Dam, N. Vonk, L. Jacobs
Summary: The study proposes a novel time-Integrated Digital Image Correlation (t-IDIC) framework to accurately measure the deformation, velocity, and strain fields of the strip in the deformation zone during rolling. Demonstrations on two different strip rolling experiments revealed subtle changes in the deformation and strain fields due to minor variations in pre-deformation, elastic recovery, and geometrical irregularities. Increasing the entry strip tension and rolling force reduced asymmetry in material feed and resulted in a more symmetric strain distribution.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Ben Tinkler-Davies, Darshil U. Shah
Summary: This study investigates the failure of laminated bamboo under compressive loading using digital image correlation, revealing that a 45-degree shear face is the main cause of ultimate failure. However, breakdown in the analysis occurred when the strain exceeded -30%.
Article
Materials Science, Multidisciplinary
Cancan Chen, Heping Xie, Jiang Xu, Shoujian Peng, Cunbao Li, Minghui Li
Summary: Understanding the evolution of rock creep and its time-dependent property is crucial for predicting geohazards and assessing the long-term stability of geotechnical structures. A study using a three-dimensional digital image correlation system investigated the creep behavior of sandstone under the influence of stress and pore water pressure. The results revealed that increasing the pore water pressure significantly promoted creep deformation, enhanced the creep rate, and accelerated rock failure. The development of microcracks on the rock surface was observed in the localized strain field, serving as a precursor and early warning of rock creep failure.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Rong Wu, Yanbing Li, Shuiqiang Zhang
Summary: Savitzky-Golay (SG) filter is an effective method for full-field strain measurement in digital image correlation (DIC). This study proposed a strain calculation method based on frequency domain SG (FD-SG) filtering, which showed equivalent accuracy to the spatial domain SG filtering. The proposed FD-SG filtering method has great potential for real-time strain measurement in DIC.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Pingkuang Luo, Lichuan Wang, Diyuan Li, Junsheng Yang, Xinxin Lv
Summary: The deformation characteristics and failure properties of horizontal soft and hard interbedded rock-like samples were studied under uniaxial compression. The peak uniaxial compressive strength of the samples decreases with the increasing of the height-length ratios. The failure process is dominated by axial splitting and buckling.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Materials Science, Ceramics
Julie Uhl, Aurelien Doitrand, Sylvain Meille
Summary: The failure behavior of gypsum specimens under four-point bending is studied through experimental and numerical analysis. The study considers variations in specimen thickness, pore volume fraction, and the presence of macropores. Fracture surface examination reveals isolated macropores near the tension-loaded specimen face. The size and location of the critical pores influence failure stress scattering, which can be effectively reproduced using a coupled criterion.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
R. Vargas, R. B. Canto, B. Smaniotto, F. Hild
Summary: Crack propagation in alumina castable refractory with mullite-zirconia aggregates was studied using a laboratory tomograph and digital volume correlation. The influence of a realistic crack path on the fracture simulation was investigated. A cohesive law was chosen and calibrated using finite element model updating. The results showed higher fracture energy and cohesive strength when assuming a straight crack path instead of the experimental crack path.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Geological
H. Shariati, A. Bouterf, M. Saadati, P-L Larsson, F. Hild
Summary: The spherical indentation of granite was investigated using Digital Volume Correlation (DVC) to probe constitutive laws of the rock. Three laws were studied, including pure elasticity, compressible elastoplasticity, and compressible elastoplasticity coupled with damage, with a focus on frictional contact effects. Results indicate that considering compressible elastoplasticity is crucial for accurate results, and frictional effects play a significant role in damage extent.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Mechanical
Vinicius Fiocco Sciuti, Rafael Vargas, Rodrigo Bresciani Canto, Francois Hild
Summary: Damage caused by MgO hydration in castables was studied using bar resonance and recently Digital Image Correlation (DIC). The kinetics of the hydration reaction was investigated through principal component analyses (PCA) applied to DIC results of images obtained during 60 hours of curing and drying of an MgO-containing refractory castable. The experiment was conducted in an in-house climatic chamber at 50 degrees C and 50% relative air humidity. The displacement and maximum eigen strain fields were obtained via DIC. The crack network was identified as the most significant component by PCA analysis, exhibiting a sigmoidal curve in temporal development that could be satisfactorily fitted by a two-parameter Weibull law. The reaction duration was virtually the same for both fields, with only a time shift in reaction initiation and saturation attributed to the choice of field. This approach eliminates the need for user-defined thresholds for crack quantification.
JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN
(2023)
Article
Engineering, Biomedical
T. Lavigne, A. Mazier, A. Perney, S. P. A. Bordas, F. Hild, J. Lengiewicz
Summary: This study demonstrated the feasibility of using FE-based DVC technology to measure the deformation of female breast tissues in different body positions, successfully capturing the large displacement field of hard/soft tissue samples and providing a new approach for capturing large tissue deformations.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ana Vrgoc, Zvonimir Tomicevic, Benjamin Smaniotto, Francois Hild
Summary: The results of in-situ cyclic tensile experiments on glass fiber mat reinforced polyester resin dogbone specimens were analyzed using X-ray Computed Tomography and Digital Volume Correlation. Both specimens failed at equal stress levels, indicating the notch insensitivity of the material. Strain and damage analysis showed the development of inner strained bands in both specimens, even in the first loading cycle, indicating the path to final fracture. The study concludes that the final failure of the material was primarily driven by the yarn mesostructure.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Mechanical
Aliaksandra Tsitova, Fabien Bernachy-Barbe, Benoit Bary, Christophe Bourcier, Francois Hild
Summary: The identification of fracture properties of mortar was achieved through numerical analyses of two in situ mesoflexural tests on small-scale specimens. The experimental kinematic fields were measured by processing the reconstructed volumes via Digital Volume Correlation. The simulated fracture paths and ultimate forces were consistent with the experiment thanks to representative microstructure and boundary conditions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Alessandro Ciallella, Gabriele La Valle, Antoine Vintache, Benjamin Smaniotto, Francois Hild
Summary: Pantographic blocks are metamaterials composed of parallel sheets connected by cylindrical pivots. In this paper, a pantographic block subjected to 3-point flexure exhibits monoclastic deformation when the prescribed displacements are parallel to the pantographic plane. A reduced order model based on a second gradient 3-dimensional continuum model is used to simulate the behavior of pantographic blocks at the cellular level. Digital Volume Correlation (DVC) techniques are employed to measure the deformed shapes of pantographic blocks under large displacements and strains.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Aliaksandra Tsitova, Fabien Bernachy-Barbe, Benoit Bary, Francois Hild
Summary: This study investigated the creep damage of concrete using experimental and numerical methods. Compressive creep tests were conducted on cement paste and mortar to analyze the influence of material heterogeneity and stress level on creep rate. The obtained data were used to calibrate a creep constitutive model and predict the creep damage interactions.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ante Buljac, Xiang Kong, Lukas Helfen, Francois Hild, Thilo F. Morgeneyer
Summary: Damage and strain changes during shear dominated loading were studied using synchrotron laminography and digital volume correlation (DVC). The results showed localized strain fields and grain-related elongated cracks in the shear zone, with damage primarily concentrated in the gage section subjected to shear. The total Hencky von Mises strain close to failure was measured in the material bulk, reaching values between 0.6 and 0.7.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Composites
Lucas Rajinthan, Simon Fritz, Igor Galkov, Liuyin Jiang, Sylvain Fournier, Julien Bernard, Sylvain Meille, Aurelien Doitrand, Guilhem P. Baeza
Summary: We produce nacre-like composites made of a flexible thermoplastic elastomer matrix reinforced by alumina platelets. The study reveals that the mobility of the polymer significantly decreases as the content of platelets increases, leading to limited quality of samples. Mechanical tests on samples with different platelet contents are used to explain the variation in mechanical properties related to the polymer state. Additionally, the addition of iron nanoparticles enables induction heating of the composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Haizhou Liu, Lingtao Mao, Yang Ju, Francois Hild
Summary: In order to investigate the damage development of coal under different loading conditions, in-situ tests in uniaxial and triaxial compression were conducted. Advanced digital volume correlation based on finite element discretization was used to quantify the three-dimensional initial and newborn fractures. The experiments revealed that the damage growth in coal was substantially affected by randomly distributed initial defects, and prior to a macroscopic failure, the coal samples generally experienced pre-existing fracture closure, newborn fracture initiation, interaction and propagation of the two fracture types. The study aimed to gain in-depth insights into the bulk fracture of coal and provide quantitative evidence for further understanding the damage mechanisms from the microscale to the macroscale.
Article
Materials Science, Multidisciplinary
Vinicius Fiocco Sciuti, Rafael Vargas, Nestor Guerrero, Maria Eugenia Marante, Francois Hild
Summary: This study conducted cyclic lateral load tests on masonry walls to investigate earthquake-induced damage. It was found that finite element-based digital image correlation can effectively detect and quantify small cracks in large structures. The proposed framework utilizing pixel-wise gray-level residuals and crack opening displacement fields provides valuable information for validating damage models and full-scale simulations.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Chemistry, Physical
Ana Mandic, Viktor Kosin, Clement Jailin, Zvonimir Tomicevic, Benjamin Smaniotto, Francois Hild
Summary: In this study, a Projection-based Digital Volume Correlation (P-DVC) method is proposed to quantitatively analyze the deformation and damage growth of specimens by decomposing the displacement field into spatial modes and temporal amplitudes.
Article
Biology
R. E. M. Y. GAUTHIER, H. E. L. E. N. E. FOLLET, ANA-MARIA TRUNFIO-SFARGHIU, D. E. L. P. H. I. N. E. FARLAY, N. I. N. A. ATTIK, S. Y. L. V. A. I. N. Meille, J. E. R. O. M. E. CHEVALIER, D. A. V. I. D. MITTON
Summary: Understanding the mechanisms of bone mechanical integrity is crucial for developing effective bone healing strategies. The matrix surrounding osteocytes, which are mechanosensitive cells responsible for bone remodeling, plays a significant role in bone repair and regeneration. However, the fluid behavior at the bone-implant interface is more complex and requires further investigation. New markers for bone mechanical integrity should be defined considering fluid behavior to improve bone biomaterial development.
