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Investigations on the crack resistance characteristics of asphalt concrete based on digital image correlation method

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ENGINEERING FRACTURE MECHANICS 2024年 307卷

作者： Cao, Guorui Qing, Longbang Duan, Junbang Chen, Libiao Zeng, Juncheng Yan, Erhu Liu, Tianyun Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China Hebei Univ Technol Sch Civil & Transportat Engn Tianjin 300401 Peoples R China Qinghai Upper Yellow River Hydropower Dev Co Ltd Engn Construct Branch Xining 810003 Peoples R China Fujian Expressway Grp Co Ltd Fuzhou 350001 Fujian Peoples R China Fujian Expressway Sci & Technol Innovat Res Inst C Fuzhou 350001 Fujian Peoples R China Minist Transport Res Inst Highway Beijing 100088 Peoples R China

The evaluation of the cracking performance of asphalt concrete is essential for a comprehensive understanding of the crack resistance behavior. Based on the digital image correlation method, notched semi-circular bending (SCB) fracture tests under different temperatures, loading rates and initial crack lengths were carried out. The cracking resistance index CRI and fracture toughness of asphalt concrete were calculated;Meanwhile, the crack resistance KR curves were analyzed. Research results indicate that compared with SCB samples tested at 0 degrees C similar to 20 degrees C, smaller CRI values under -10 degrees C are presented, indicating that asphalt concrete shows more brittle fracture behavior. The CRI values gradually decrease with the loading rate and are less affected by the initial crack length. The fracture toughness decreases with the temperature and initial crack length, and its values show an ascending tendency with the loading rate. The KR curves increase with crack propagation length, indicating that the crack resistance ability of asphalt concrete is improved during the crack evolution process.

关键词： Asphalt concrete Crack resistance Fracture toughness Crack evolution process digital image correlation method

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Bending Performance of Alkali-Activated Concrete Beams Based on digital image correlation method

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MATERIALS 2025年第7期18卷 1616-1616页

作者： Gao, Hongbo Sun, Hongna Wang, Zhaokun Han, Xiaoyan Li, Xinru Hainan Univ Sch Civil Engn & Architecture Haikou 570228 Peoples R China Ludong Univ Sch Hydraul & Civil Engn Yantai 264025 Peoples R China Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China

To optimize the design of concrete beams and assess the performance of new materials, four-point bending tests were conducted to examine the bending behavior of alkali-activated concrete (ALAC) beams with different reinforcement ratios. The cracking load, displacement, and crack width were measured using the digital image correlation (DIC) method and compared with results obtained through traditional methods. The findings demonstrate that DIC significantly outperforms traditional techniques in determining crack load, displacement, and crack width, particularly in capturing crack initiation and propagation. As the reinforcement ratio increases, the mid-span displacement at the peak load decreases for ALAC beams. At the same reinforcement ratio, the ALAC beam exhibits 1.07 times the bearing capacity, 1.4 times the mid-span displacement, and 0.72 times the maximum crack width compared to ordinary Portland cement concrete (PCC) beams. The cracking load, calculated using a plasticity coefficient of 1.17 for the section resistance moment, aligns closely with the experimental results. Furthermore, the formulas for mid-span displacement and maximum crack width in ordinary concrete beams can also predict the corresponding properties of ALAC beams. These findings validate the mechanical behavior and application potential of ALAC beams under various reinforcement ratios.

关键词： alkali-activated concrete four-point bending test digital image correlation method crack width

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Tire deformation measurement technology based on digital image correlation method

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING 2024年第5期238卷 1014-1026页

作者： Liang, Chen Shen, Yucheng Shan, Maoqing Li, Han Jiangsu Univ Sch Automot & Traff Engn Zhenjiang Peoples R China Jiangsu Univ Sch Automot & Traff Engn 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China

The contact between the tire and the road surface causes tread deformation, and using traditional methods to measure tire tread deformation is difficult and time-consuming. Therefore, based on the principle of the digital image correlation method, this paper develops a binocular vision measurement system and realizes the measurement of tire tread deformation through the test bench for tire ground pressure distribution measurement. The related programs of the measurement system, including camera calibration, image matching, and strain fitting, are proposed. The deformation measurement accuracy of the test bench is validated by the sprayed speckle rubber sheet test, and the relative error of the theoretical value and measurement value is within 2%. The tire tread deformation test under static loading conditions was carried out using the test bench, and the tread strain distribution in the contact area was obtained. The analysis of the test results shows that the strain distribution in the contact patch is axisymmetric under static loading conditions. The longitudinal (tire rolling direction) deformation of the tread at the leading edge and the trailing edge area of the contact patch has the largest strain, while the deformation of the shoulder area on both sides of the contact patch is relatively small. For lateral (tire axial direction) deformation, the leading edge and the trailing edge areas of the contact patch are less deformed, and the strain distribution is approximately axisymmetric. The shoulder area of the contact surface has a larger deformation. The tire's outer shoulder area has a larger deformation than the inside shoulder area, which may be due to the asymmetric tread structure of the tire. For the vertical deformation of the tread, the central area of the tread has the smallest strain, while the surrounding area has a much larger vertical strain.

关键词： Radial tire deformation measurement digital image correlation method binocular vision image matching

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In situ measurements of the high-temperature mechanical properties of ZrO2-doped YTaO4 ceramic by three-point bending combined with a digital image correlation method

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CERAMICS INTERNATIONAL 2022年第5期48卷 7159-7167页

作者： Zhou, Z. P. Yuan, W. Z. Zhu, W. Hu, X. P. Zou, Y. Wu, Q. Wei, H. Q. Xiangtan Univ Sch Mat Sci & Engn Xiangtan 411105 Hunan Peoples R China Shaoyang Univ Coll Mech & Energy Engn Shaoyang 422000 Hunan Peoples R China

ZrO2-doped YTaO4 ceramics with different ZrO2 contents (Y1-xTa1-xZr2xO4 ceramics, 2x = 0, 0.1, 0.15, 0.2) are prepared by a solid-state reaction method. The high-temperature mechanical properties are determined by an in situ high-temperature three-point bending combined with the digital image correlation (DIC) method. The results show that when the temperature rises from 25 degrees C to 800 degrees C, the temperature dependence of the elastic modulus, fracture toughness and fracture strength with a ZrO2 doping content of 10% mol is relatively small. The elastic modulus, fracture toughness and fracture strength decrease from 105.4 GPa to 96.1 GPa, from 2.6 MPa m(1/2) to 2.3 MPa m(1/2) and from 73.8 MPa to 64.8 MPa, respectively. Transgranular fracture is the main fracture mode. When the crack propagates through the twin band, a phase transformation and a typical domain change occur. Furthermore, the crack propagating through the twin band at room temperature (25 degrees C) is more tortuous than that at 800 degrees C, and more energy needs to be consumed. This illustrates that the fracture toughness and fracture strength at room temperature (25 degrees C) are higher than those at high temperature.

关键词： Zirconia doping High-temperature mechanical properties Three-point bending digital image correlation method Fracture mechanism YTaO4 ceramics

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Material Property Measurement of 3D Printed Carbon Fiber Composite Using a digital image correlation method

Material Property Measurement of 3D Printed Carbon Fiber Com...

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Asia-Pacific International Symposium on Aerospace Technology (APISAT)

作者： Quan, Feng Xin, Rui Hai Goo, Nam Seo Konkuk Univ Dept Mech & Aerosp Engn Seoul South Korea

ISBN: (纸本)9789811926891;9789811926884

Three-dimensional (3D) printing of carbon fiber composite is a promising manufacturing process for aerospace and other industry fields because it is fast and easy to implement and requires less labor. Knowledge of the material properties of the 3D printed composite is important for applications to aerospace and other industrial structures. In this study, a digital image correlation (DIC) technique is employed to measure the material properties of 3D printed composites. This is a non-contact measurement method, and able to measure the full-field displacement and strain of the structure. This study provides a suitable testing method for determining the material properties of 3D printed continuous fiber composite materials according to ASTM standards using the DIC method.

关键词： 3D printed composite Material property digital image correlation method ASTM

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Measurement of High-Speed Deformation Behavior by digital image correlation method

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Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering 2024年第12期90卷 891-895页

作者： Nishida, Masahiro

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U-Net learning for the automatic identification of the sandstone crack tip position to determine mixed-mode stress intensity factors utilizing digital image correlation method

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THEORETICAL AND APPLIED FRACTURE MECHANICS 2023年第1期127卷

作者： Li, Yingjie Ni, Ting Zhang, Fang Li, Yuanhang Zuo, Jianping Zhao, Shankun China Univ Min & Technol Beijing Sch Mech & Civil Engn Beijing 100083 Peoples R China China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Beijing 100083 Peoples R China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Beijing 100024 Peoples R China China Coal Res Inst China Coal Technol & Engn Grp Beijing 100013 Peoples R China

Tracking the crack tip position in crack growth is a key and difficult problem in calculating mixed-mode I-II dynamic stress intensity factors based on displacement field obtained by digital image correlation method (DIC). U-Net in deep learning is used to perform pixel-level semantic segmentation on the experimental images of mixed-mode I-II cracks propagation under the three-point bending of brittle sandstone to identify crack features and locate the crack tip position. On this basis, the digital image correlation displacement data are substituted into the Williams displacement field equation to calculate the dynamic stress intensity factors at different loading stages. The results show that the U-Net network model can achieve image segmentation and process experimental pictures in batches, and accurately detects cracks in images with speckles which has been demonstrated potential in identifying crack propagation paths and tip positions. When the position of the crack tip is known, the solution for the stress intensity factor converts the non-linear equation system to a linear one and solves it with the linear least squares method. This significantly improves the solution accuracy and speed of the mixed-mode I-II dynamic stress intensity factors. Simultaneously, according to the position of the crack tip, the crack propagation path during the loading process can be drawn, which provides a reference for research on the evolution in crack growth.

关键词： Sandstone Mixed-mode I-II cracks digital image correlation method Stress intensity factor Convolutional neural network

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Laboratory visualization of supercritical CO2 fracturing in tight sandstone using digital image correlation method

GEOENERGY SCIENCE AND ENGINEERING

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GEOENERGY SCIENCE AND ENGINEERING 2023年 225卷

作者： Zang, Yuxi Wang, Quan Wang, Haizhu Wang, Bin Tian, Kangjian Wang, Tianyu Li, Jie Zhang, Zhichao Tian, Shouceng Stanchits, Sergey Cheremisin, Alexey Edery, Yaniv China Univ Petr State Key Lab Petroleunm Resources & Prospecting Beijing 102249 Peoples R China PetroChina Xinjiang Oilfield Co Karamay 834000 Peoples R China Skolkovo Inst Sci & Technol Moscow 121205 Russia Technion Israel Inst Technol IL-7610001 Haifa Israel

Hydraulic fracturing is a crucial technology for reservoir stimulation in unconventional reservoirs. Conventional water-based fracturing has several potential issues of environmental pollution and waste of water resources. Anhydrous fracturing fluids, such as supercritical CO2 (SC-CO2), are now utilized for fracturing in recently years. However, the fundamental mechanism of fracture initiation and propagation during SC-CO2 fracturing has not been fully understood. A tri-axial fracturing visualization equipment is developed in this work, which can conduct fracturing experiments under reservoir conditions (150 degrees C and 50 MPa). The injection pressure, fracture propagation and strain field of the entire hydraulic fracturing procedure can be quantitatively monitored using a high-speed camera and digital image correlation (DIC) technology. Results demonstrate that low-viscosity fluids (SC-CO2) tend to induce micro-fractures, mainly generating mode I-II composite fractures. However, relatively high-viscosity fluids (Liquid-CO2) tend to form a simple pattern, mainly mode I fractures. SC-CO2 shows strong diffusivity and can easily diffuse into micro-fractures. As a result of the increased pore pressures in the rock around the wellbore, SC-CO2 fracturing has a breakdown pressure that is 22% lower than L-CO2 fracturing. The fracture initiation time of SC-CO2 fracturing is about 34% later than that of L-CO2 fracturing. An equivalent strain difference coefficient is proposed and indicates that the strain concentration effect of SC-CO2 fracturing is more obvious than L-CO2 fracturing. Meanwhile, the DIC measured full-field displacement field indicates that the fracture width produced by SC-CO2 is 1.31 mm, which is narrower than that produced by L-CO2 of 1.58 mm. This experiment shows that the DIC method can provide an intuitive, accurate, and effective method for quantifying fracture characteristics. The results can provide an empirical reference for further analysis of the

关键词： Supercritical CO 2 fracturing Fracture propagation Fracture pattern digital image correlation method

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Research on mechanical properties and failure mechanism of TRM composites via digital image correlation method and finite element simulation

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COMPOSITE STRUCTURES 2023年第1期311卷

作者： Zhao, Mingyue Pei, Xiaoyuan Luo, Shigang Yan, Minjie Xing, Wenjin Wang, Wei Liu, Shengkai Shao, Ruiqi Xu, Zhiwei Tiangong Univ Sch Text Sci & Engn Key Lab Adv Braided Composites Minist Educ Tianjin 300387 Peoples R China Carbon Technol Grp Co Ltd Tianjin 300380 Peoples R China Flinders Univ S Australia Coll Sci & Engn Adelaide SA 5042 Australia

The purpose of this paper is to study tensile properties and interfacial bonding properties of textile reinforced mortar composites (TRM) widely used for externally strengthening damaged buildings. Based on the digital image correlation (DIC) method and finite element (FE) simulation, the tensile and interfacial shear test results of steel fiber textile and carbon fiber textile reinforced mortar composites were analyzed. First, DIC was used to detect the crack onset and propagation of the specimen during the tensile process. The concept of gradient interface was introduced to improve the bonding performance. The effects of the hydration degree of mortar, and reinforcing textile type on interfacial bonding properties were then evaluated through double-lap shear testing. Last, the stress distribution and load transfer during textile pull-out from the mortar were analyzed based on FE simulation with the bond-slip law extracted from the double-lap shear experiment.

关键词： Textiles Stress transfer Interface Finite element simulation digital image correlation method

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Tensile strength of sea ice using splitting tests based on the digital image correlation method

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Advances in Polar Science 2021年第4期32卷 374-381页

作者： CHEN Xiaodong HE Shuaikang HE Wenquan WANG Zhaoyu JI Shunying State Key Laboratory of Structure Analysis of Industrial Equipment Dalian University of TechnologyDalian 116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Marine Environmental Forecasting Station of Yingkou Yingkou 115007China Marine Monitoring and Early Warning Center of Liaoning Shenyang 110001China

The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for ***,the approach was questioned to the neglect of local plastic deformation during the *** this study,splitting tests were performed on sea ice,with 32 samples subjected to the regular procedure and 8 samples subjected to the digital image correlation *** salinity,density,and temperature were measured to determine the total *** the advantage of the digital image correlation method,the full-field deformation of the ice samples could be *** the loading direction,the samples mainly deformed at the ice-platen contact *** the direction vertical to the loading,deformation appears along the central line where the splitting crack *** on the distribution of the sample deformation,a modified solution was derived to calculate the tensile strength with the maximum *** on the modified solution,the tensile strength was further calculated together with the splitting test *** results show that the tensile strength has a negative correlation with the total porosity,which agrees with previous studies based on uniaxial tension tests.

关键词： tensile strength splitting test digital image correlation method ice mechanics sea ice

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