Article
Chemistry, Multidisciplinary
Changhao Xin, Yu Yang, Mengze Yang, Pengfei Liang, Yidan Sun, Huazhang Shen
Summary: This study investigates the stress-strain characteristics of compressed sandstone under different conditions and analyzes the evolution of the strain field using Digital Image Correlation technology. The relationship between the stress-strain curves and the strain field is preliminarily explained.
APPLIED SCIENCES-BASEL
(2022)
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
Construction & Building Technology
Dandan Shi, Xudong Chen, Yingjie Ning
Summary: This study investigates the failure mechanism of different composites through compression tests and damage monitoring techniques. The results indicate that the peak strength of the composites is mainly determined by the shotcrete, while the fiber effectively improves the ductility. Additionally, the analysis of acoustic emission parameters reveals that the fiber has a greater influence on the damage mechanism of the composites.
ACI MATERIALS JOURNAL
(2022)
Article
Mechanics
Norberto Feito, Eugenio Giner, Jose Vicente Calvo, M. Henar Miguelez
Summary: In this study, the authors present an experimental and numerical analysis of the effect of delamination combined with uniaxial compressive loads on the stability and structure failure of laminate composite materials. The 3D Digital Imagen Correlation technique was applied to predict and validate the buckling initiation and propagation, and cohesive zone model (CZM) was used to predict delamination. The study provides important insights for predicting crack initiation and progression in laminate materials.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Geological
Yian Chen, Jiang Xu, Shoujian Peng, Qianwen Zhang, Cancan Chen
Summary: This study conducted triaxial compression tests on sandstone samples under different seepage pressures using a 3D digital image correlation technique. The results revealed that the strength and brittleness of the rock decrease with increasing seepage pressure, and the mechanical properties of the rock are highly dependent on the seepage pressure. The analysis of the radial strain field on the rock surface showed a gradual process of strain localization instead of a sudden occurrence before failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Civil
Zhiao Gao, Lingwei Kong, Zhenhua Zhou, Shuangjiao Wang
Summary: This study investigates the damage evolution of expansive clay with filled fissures by evaluating the stress-strain-resistivity curves. The results show that increasing the inclination angles of fissures decreases the strength linearly and changes the stress-strain behavior from hardening to softening. The failure modes of various fissure morphologies are classified into three main types. This study provides a reference for understanding fissured soil's failure process and applying comprehensive resistivity testing technology in fissured soil mechanics.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
A. Brodecki, M. Kopec, Z. L. Kowalewski
Summary: This research compares the long-time degradation effect on two different states of 10CrMo9-10 (10H2M) power engineering steel using various experimental and analytical approaches. Fatigue loading was applied to specimens machined from the as-received steel and the same material after 280,000 hours of exploitation at 540 degrees C and 2.9 MPa internal pressure, while monitoring with Digital Image Correlation (DIC) technique. The impact of long-time degradation on the mechanical response of 10H2M steel was studied through fractographic observations, characterized by the fatigue damage measure, phi, and the fatigue damage parameter D.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Multidisciplinary
Mateusz Kopec, Grzegorz Garbacz, Adam Brodecki, Zbigniew L. Kowalewski
Summary: This paper proposes a combined method for the mechanical properties assessment of composite materials based on the analysis of the internal dynamics of raw data from uniaxial tensile tests. The correctness of the methodology proposed was verified by the full filed DIC measurements. The experimental program confirmed the high suitability of the presented methodology in ultimate tensile stress identification, and thus, its great applicability potential in many aspects of the contemporary engineering.
Article
Green & Sustainable Science & Technology
Baolin Xiong, Jia Sun, Yunmeng Zhao, Zhuangzhuang Wang, Zhiyuan Wang, Bo Chen
Summary: This study used digital image correlation method and acoustic emission equipment to observe the crack growth process in composite rock strata. The results showed that the strain field dispersion can be quantified using the covariance matrix parameter V, and the crack types can be identified based on the growth rate of V.
Article
Engineering, Mechanical
Peng Li, Meifeng Cai, Yubing Gao, Mostafa Gorjian, Shengjun Miao, Yu Wang
Summary: Uniaxial compression tests were conducted on jointed granite samples with openings to investigate the macro/mesofracture and instability behaviors. The results showed that the peak strength and elastic modulus of the samples first decreased and then increased with increasing joint angle, reaching a minimum at around 45 degrees. The AE cumulative count before the peak stress was related to crack initiation or interpenetration, while the instantaneous increase in the AE count after the peak stress was associated with the stress drop caused by high strain localization or the formation of visible cracks. The accelerated release of AE energy can provide early warning for rock instability and failure. The existence of joints changed the stress distribution patterns and interacted with high stress concentration areas to dominate the fracturing process.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Jingwei Ying, Junzhou Huang, Jianzhuang Xiao
Summary: In this study, a combined test device was developed to investigate the effect of microcracks on rapid chloride ion diffusion in recycled fine aggregate mortar under uniaxial compression loading. Deformation, microcrack growth, chloride ion distribution, and porosity were evaluated using various testing methods. It was found that chloride ion transportation is influenced by pore structure and natural fine aggregate content. A novel statistical specific crack area method based on DIC was proposed to predict the chloride diffusion coefficient in mortar with recycled fine aggregate.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Metallurgy & Metallurgical Engineering
Su Li, Hang Lin, Qi-bin Lin, Yi-xian Wang, Yan-lin Zhao, Hui-hua Hu
Summary: This study investigates the combined action of joints and bedding plane on crack evolution in flawed layered rock masses. Experimental tests were conducted on double-layer composite rock-like specimens with multi-inclination two coplanar joints under different bedding angles. The results indicate that the presence of bedding plane and joints significantly affect the stress-strain curves and strength parameters. The crack propagation path and failure mode transition are also greatly influenced by the variation of bedding angle. In addition, a new type of tensile crack that initiates from the bedding plane and propagates easily in the upper layer was observed.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Review
Optics
Ghulam Mubashar Hassan
Summary: Digital Image Correlation (DIC) has been successful in measuring deformation remotely, but has limitations in measuring discontinuous deformation, restricting its application to lab environment. This study systematically analyzes different methodologies to overcome the limitations of DIC and presents future research directions in this area.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Engineering, Geological
Xige Liu, Wancheng Zhu, Penghai Zhang, Lankun Li
Summary: Uniaxial compressive tests on Y-jointed granite specimens revealed that as the uniaxial compressive strength of the specimens increased, different failure modes appeared, including shear failure, compressive failure, and overall crushing, each with different ac thresholds. The joint dip angle and joint roughness were found to significantly influence the strength of the specimens.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Xiang Ji, Tianjun Zhang, Bing Ji, Lei Zhang, Mingkun Pang, Hongyu Pan, Bingnan Ji
Summary: Gas extraction boreholes are important for solving mine gas disasters, but the deformation and damage of coal and rock around the boreholes can affect the gas extraction. In this study, the effects of grouting material strength on the deformation and damage of coal and rock bodies around boreholes were investigated using digital image correlation. It was found that increasing the strength of the grouting material increased the compressive strength of the specimens and reduced the width of cracks around the boreholes.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Mechanics
Yu-jing Ge, Gan-yun Huang
Summary: The excellent mechanical properties of nacre are attributed to its interlocking structure at the interface between the mineral platelet and the organic layer, which plays a vital role in enhancing sliding resistance and fracture toughness. By applying a crack-bridging model, researchers investigated the influence of the interlocking angle on the fracture toughness and crack-bridging toughening effect of nacre, leading to consistent results with experimental observations. This model is significant for guiding the design of novel nacre-like materials with optimized interface interlocking.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Hao Zhang, Xunpeng Li, Lingyu Zhao, Haipeng Song, Ganyun Huang
Summary: The local deformation and fracture behaviors of titanium alloy Ti6Al4V were studied using in situ scanning electron microscope (SEM). It was found that strain localization occurred in both uniaxial tensile and shear samples. The coalescence and shapes of voids in different stress states were investigated by observing the fracture surfaces.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Chemistry, Physical
Yufan Yan, Xianjia Meng, Chuanyong Qu
Summary: This study proposed a nonlinear bi-modulus gradient model to investigate the fatigue damage behavior of bone. The digital image correlation technique was used to analyze the tensile and compressive strains during the fatigue process, and a theoretical model was proposed to describe the degradation process of the elastic modulus and the movement of the neutral axis. The changes in bone properties were determined using the FEM method, and the results obtained from two different methods showed good consistency.
Article
Materials Science, Multidisciplinary
W. Qiu, S. S. He, Y. Chang, L. L. Ma, C. Y. Qu
Summary: In this paper, we focus on the two main factors that affect the confidence of the Raman spectrum, namely, the frequency shift repeatability of the instrument and the polarization control accuracy. Through a combination of physical experiments and numerical ones, the influence of random error in the Raman measurement system, initial error and random error in the polarization angle on the decoupling characterization of the stress component is quantitatively analyzed.
EXPERIMENTAL MECHANICS
(2022)
Article
Chemistry, Physical
Hao Zhang, Tao Gao, Jian Chen, Xunpeng Li, Haipeng Song, Ganyun Huang
Summary: The damage and failure of titanium alloy Ti6Al4V were investigated through experiments and numerical simulations. The results show that strain localization occurs before crack initiation and is highly affected by shear stress. The stress triaxiality has a significant influence on the formation and growth of micro-voids, leading to a decrease in strain at failure.
Article
Mechanics
Yang Lu, Gan-Yun Huang, Yan-Feng Wang, Yue-Sheng Wang
Summary: This paper theoretically studied the longitudinal elastic wave propagation in nacre-like materials with brick-and-mortar microstructures. A viscoelastic model was developed to describe the sacrificial bond behavior for the organic matrix. The shear-lag model was used to simulate the deformation of the brick-mortar structure. It was found that bandgaps could arise in such bio-inspired periodic structures and attenuated propagation of elastic waves dominated at higher frequencies.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Thermodynamics
Yu-Ze Tian, Yan-Feng Wang, Gan-Yun Huang, Vincent Laude, Yue-Sheng Wang
Summary: In this paper, thermoelastic cloaks with dual functionality are designed using the coordinate transformation technique. The external invisibility of the cloaks is achieved and the influence of symmetrization on internal displacement is discussed, providing new research directions for metamaterials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Ting-Ting Wang, Yi-Ran Li, Gan-Yun Huang
Summary: A mechanical model is proposed to describe the peeling behavior of a film bonded to an elastic substrate with finite length. The film is treated as an elastic beam, and the root rotation at the boundary between the debonded and bonded portions is obtained. Numerical results show significant effects of root rotation, Young's modulus ratio, and film's aspect ratio on the stress intensity factors. Empirical expressions for the stress intensity factors and the peeling force are presented based on the numerical results. The findings can contribute to the characterization of film-substrate systems.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Chemical
Ting-Ting Wang, Yi-Ran Li, Gan-Yun Huang
Summary: In this study, adhesion is introduced into the model of receding contact between an elastic layer and a half plane under flat and parabolic punches. By using the JKR model for adhesion and integral transformation, the problem solution can be reduced to a system of singular integral equations. A numerical scheme has been proposed and validated, and the effect of adhesion on contact size and stresses has been demonstrated.
JOURNAL OF ADHESION
(2023)
Article
Materials Science, Multidisciplinary
Hao Zhang, Tao Gao, Chang Xu, Lingyu Zhao, Haipeng Song, Ganyun Huang
Summary: The deformation and failure of Ti6Al4V produced by Selective Laser Melting (SLM) under tensile and shear stress states have been experimentally investigated. The effects of building direction on the mechanical behavior were studied, showing that the yield strength and tensile strength are slightly lower along the build direction, but the vertical samples have higher ductility. Fractographic analyses revealed that the nucleation, growth, and coalescence of micro voids are the main damage mechanism under tensile loading condition, while void shearing mechanism dominates the failure of shear samples.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Mathematics, Applied
Yiran Li, Tingting Wang, Liaoliang Ke, Ganyun Huang
Summary: This study proposes a model for the slender slider-substrate system to investigate the physical mechanism of sliding onset. The analysis of interfacial dislocation nucleation and mobility provides insights into the sliding onset. The model's solution is consistent with experimental results, and the critical force for static dislocation nucleation aligns with sliding precursors, suggesting the relevance of this model to understanding sliding onset.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Chemistry, Physical
Bowen Han, Mingyuan Sun, Ying Chang, Saisai He, Yuqi Zhao, Chuanyong Qu, Wei Qiu
Summary: In this work, a theoretical model of stress characterization for GaN was developed using polarized micro-Raman spectroscopy based on elasticity theory and lattice dynamics. The model can provide a quantitative relationship between all components of the in-plane stress tensor and the measured Raman shift. By combining the stress characterization model with the expanding cavity model, the in-plane residual stress component field around Berkovich indentation on the (0001) plane GaN was achieved. The experimental results showed that the distributions of the stress components were significantly different from the distribution of the Raman shift and had a gradient along each crystal direction, closely related to the GaN crystal structure.
Article
Materials Science, Multidisciplinary
Hongliang Zhang, Chuanyong Qu
Summary: A user subroutine was developed to simulate the fatigue damage behavior of the TBM main bearing under low speed and heavy load. The damage evolution law in the time and space domains was studied, and a nonlinear spring element was introduced to simulate the interaction between the roller raceway. The research showed that the damage risk of the raceway is greater than that of the roller, and the damage of the main bearing increases the peak vibration response and frequency components of the TBM.
Article
Materials Science, Multidisciplinary
Xianjia Meng, Qinghua Qin, Chuanyong Qu
Summary: The study utilized nanoindentation to investigate the micro-mechanical properties of bone under fatigue loading, revealing a significant decrease in reduced modulus and a slight increase in the time constant of creep after loading to fracture. These findings suggest that fatigue loading has a larger impact on bone's reduced modulus compared to other mechanical properties.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Mechanics
Ting-Ting Wang, Yi-Ran Li, Gan-Yun Huang
Summary: The study proposes a mechanical model to analyze the traction at the interface between an elastic substrate and a film of finite width, revealing square-root singularity at the tractions at the film's edges. Comparison of experimental results with the theoretical model confirms the applicability of the model in testing adhesion energy.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
