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Articles de revues sur le sujet « Crack damage »

Auteur : Grafiati

Publié le 7 juin 2025

Mis à jour le 2 août 2025

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1

Zhang, Fan, Zhenqi Hu, Yusheng Liang, and Quanzhi Li. "Evaluation of Surface Crack Development and Soil Damage Based on UAV Images of Coal Mining Areas." Land 12, no. 4 (2023): 774. http://dx.doi.org/10.3390/land12040774.

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Coal mining is necessary for the development of society but at the same time causes ecological damage that must also be repaired based on science. In the arid and semi-arid regions of northwest China, surface cracks are one of the major geo-environmental problems caused by coal mining, and studies are urgently needed to determine how to effectively repair them in a scientific manner. The rapid development of unmanned aerial vehicle (UAV) remote sensing technology in recent years has resulted in a good source of data for acquiring feature information on surface cracks. Existing studies mainly f

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2

Lin, Bin, Hong Tao Zhu, Hui Wu, Z. F. Wang, and S. Y. Yu. "Evaluation and Measurement of Surface/Subsurface Crack Damage of Ground Ceramics." Materials Science Forum 471-472 (December 2004): 47–51. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.47.

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While be ground, ceramic is prone to engender surface/subsurface crack damage layer because of great grinding force and high brittle of the material. The crack damage layer was investigated in this research. In experiment, it is observed that the surface/subsurface crack damage layer consists of three kinds of cracks: surface micro-cracks, surface macro-cracks and subsurface crack system. To evaluate expediently the degree of damage to the machined components, the index of surface/subsurface crack damage - Dc, is defined.

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Chandra, N. Harish, and A. S. Sekhar. "Damage Identification and Quantification in Structures Using Wavelet Analysis." Applied Mechanics and Materials 471 (December 2013): 187–92. http://dx.doi.org/10.4028/www.scientific.net/amm.471.187.

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In this study, displacement and strain energy mode shapes obtained from the structure, are processed using continuous spatial wavelet transforms for damage identification. A cantilever and simply supported beam are analysed in ANSYS to obtain mode shapes by performing modal analysis both for damaged and undamaged conditions. Different wavelets are processed to choose the best mother wavelet for detecting crack, a representation of damage. The dimensions of crack like depth are varied from 0.5 mm. Spatial distribution of wavelet coefficients obtained is used for identifying the damage. The quan

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4

Guo, Qi, Zhimin Guo, Kang Fu, et al. "Characterization and Imaging of Damage during Creep Crack Growth in 2219 Aluminum Alloy." Journal of Physics: Conference Series 2437, no. 1 (2023): 012038. http://dx.doi.org/10.1088/1742-6596/2437/1/012038.

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Abstract Aluminum alloys have been extensively applied in aerospace field due to their light weight. Some research results show that creep crack growth is one of the main reasons for the failure of aluminum alloys in high temperature service environment. Micro-CT is a novel method to obtain damage information inside materials, which can quantitatively characterize the volume, quantity and distribution of damage. In this paper, the characterization method based on X-ray micro-CT is utilized to study the growth behavior of damage during creep crack growth of 2219 aluminum alloy. The results indi

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Deng, Luming, and Yulin Deng. "Study on Multi-Crack Damage Evolution and Fatigue Life of Corroded Steel Wires Inside In-Service Bridge Suspenders." Applied Sciences 14, no. 20 (2024): 9596. http://dx.doi.org/10.3390/app14209596.

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The parallel steel wires used in arch bridge suspenders experience random corrosion damage on their surfaces during service. Corrosion damage, including micro-cracks, pitting, and a combination of both, leads to significant stress concentration under axial loading, which affects the performance of the steel wires. The change in the stress field caused by surface damage alters the stress intensity factor at the crack tip, and the presence of adjacent crack tips significantly amplifies the stress intensity factor, thereby accelerating crack propagation. The development of small surface damages i

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Zhao, Bingyao, Ning Huang, Siyang Dai, and Ping Zhou. "Study of Prefabricated Crack Propagation on Monocrystalline Silicon Surfaces for Grinding Damage Analysis." Materials 17, no. 15 (2024): 3852. http://dx.doi.org/10.3390/ma17153852.

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Crack generation and propagation are critical aspects of grinding processes for hard and brittle materials. Despite extensive research, the impact of residual cracks from coarse grinding on the cracks generated during fine grinding remains unexplored. This study aims to bridge this gap by examining the propagation law of existing cracks under indentation using the extended finite element method. The results reveal that prefabricated cracks with depths less than the crack depth produced on an undamaged surface tend to extend further without surpassing the latter. Conversely, deeper prefabricate

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7

Tan, K. T., N. Watanabe, and Y. Iwahori. "Impact Damage Resistance, Response, and Mechanisms of Laminated Composites Reinforced by Through-Thickness Stitching." International Journal of Damage Mechanics 21, no. 1 (2011): 51–80. http://dx.doi.org/10.1177/1056789510397070.

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In this article, the study of impact damage of laminated composites reinforced by through-thickness stitching is investigated and presented in threefold. Specimens stitched with varying stitch density and stitch thread thickness are subjected to low-velocity impact via a drop-weight machine. Impact damage resistance is first studied by examining the extent of delamination area in damaged specimens using ultrasonic C-scan analysis. It is revealed that higher stitch density is more capable of impeding delamination growth by arresting cracks at closer interval and suppressing crack propagation. T

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Liang, Yusheng, Fan Zhang, Kun Yang, and Zhenqi Hu. "A Surface Crack Damage Evaluation Method Based on Kernel Density Estimation for UAV Images." Sustainability 14, no. 23 (2022): 16238. http://dx.doi.org/10.3390/su142316238.

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The development of UAV (unmanned aerial vehicle) technology provides an ideal data source for the information extraction of surface cracks, which can be used for efficient, fast, and easy access to surface damage in mining areas. Understanding how to effectively assess the degree of development of surface cracks is a prerequisite for the reasonable development of crack management measures. However, there are still no studies that have carried out a reasonable assessment of the damage level of cracks. Given this, this article proposes a surface crack damage evaluation method based on kernel den

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Gao, Ruipeng, Mengmeng Liu, Bing Wang, Yiran Wang, and Wei Shao. "Influence of Stress Intensity Factor on Rail Fatigue Crack Propagation by Finite Element Method." Materials 14, no. 19 (2021): 5720. http://dx.doi.org/10.3390/ma14195720.

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Wheel rail rolling contact fatigue is a very common form of damage, which can lead to uneven rail treads, railhead nuclear damage, etc. Therefore, ANSYS software was used to establish a three-dimensional wheel–rail contact model and analyze the effects of several main characteristics, such as the rail crack length and crack propagation angle, on the fatigue crack intensity factor during crack propagation. The main findings were as follows: (1) With the rail crack length increasing, the position where the crack propagated by mode I moved from the inner edge of the wheel–rail contact spot to the

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Fang, Zhi Hua, and Xiang Yang Liu. "Research on Recognition Methods of Crack Damage from Beam Based on the Vibration Modal." Applied Mechanics and Materials 578-579 (July 2014): 1024–27. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.1024.

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Structural crack damage will degrade its carrying capacity, and affect the security of the structure. Thus early detection of crack damage is a guarantee of the structure safety. Cracks can change the vibration characteristics of the structure, therefore we proposed a method of identifying the crack damage based on the vibration modal. Take both ends fixed beam as an example, through establish the finite element models of crack-free beam and the crack beam with different location and different depth, we calculate the displacement modal parameters of beam before and after the damage, analyze th

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Ashwini, Kosanam, Sasmita Sahu, Bijaya Bijeta Nayak, and Sudesna Roy. "Damage detection in structural elements: using adaptive Mamdani model." E3S Web of Conferences 391 (2023): 01165. http://dx.doi.org/10.1051/e3sconf/202339101165.

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In real life all the structural and machine elements work under dynamic or variable loading. Application of dynamic loading leads to fluctuating stress. Due to fluctuating stress fatigue cracks initiates. These fatigue cracks are the main reason of failures. So, it is very important to detect the crack and predict the crack life. There are different types of damages but crack is one of the most encountered damage. There are different conventional methods to detect the damage but these methods are time taking and requires removal from the machines. Therefore, researchers are giving more importa

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12

Cui, Zhendong, and Weige Han. "In SituScanning Electron Microscope (SEM) Observations of Damage and Crack Growth of Shale." Microscopy and Microanalysis 24, no. 2 (2018): 107–15. http://dx.doi.org/10.1017/s1431927618000211.

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AbstractTo better understand the formation and evolution of hierarchical crack networks in shales, observations of microscopic damage, and crack growth were conducted using anin situtensile apparatus inside a scanning electron microscope. An arched specimen with an artificial notch incised into the curved edge was shown to afford effective observation of the damage and crack growth process that occurs during the brittle fracturing of shale. Because this arched specimen design can induce a squeezing effect, reducing the tensile stress concentration at the crack tip, and preventing the brittle s

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13

Shi, Bei-xiao, Sheng-shui Chen, Hua-qiang Han, and Cheng-feng Zheng. "Expansive Soil Crack Depth under Cumulative Damage." Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/498437.

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The crack developing depth is a key problem to slope stability of the expansive soil and its project governance and the crack appears under the roles of dry-wet cycle and gradually develops. It is believed from the analysis that, because of its own cohesion, the expansive soil will have a certain amount of deformation under pulling stress but without cracks. The soil body will crack only when the deformation exceeds the ultimate tensile strain that causes cracks. And it is also believed that, due to the combined effect of various environmental factors, particularly changes of the internal wate

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14

Song, Haipeng, Changchun Liu, Hao Zhang, and Sean Leen. "A DIC-Based Study on Fatigue Damage Evolution in Pre-Corroded Aluminum Alloy 2024-T4." Materials 11, no. 11 (2018): 2243. http://dx.doi.org/10.3390/ma11112243.

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This paper investigates the fatigue damage and cracking behavior of aluminum alloy 2024-T4 with different levels of prior corrosion. Damage evolution, crack initiation and propagation were experimentally analyzed by digital image correlation, scanning electron microscopy and damage curves. Prior corrosion is shown to cause accelerated damage accumulation, inducing premature fatigue crack initiation, and affecting crack nucleation location, crack orientation and fracture path. For the pre-corrosion condition, although multiple cracks were observed, only one corrosion-initiated primary crack dom

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15

Wang, Haoyu, Wei You, Guojin Ji, Liang Wang, and Guoyou Yao. "Influence of Different Mixing Methods for Cementitious Capillary Crystalline Waterproofing Materials on the Self-Healing Capacity of Concrete Under Various Damage Types." Materials 18, no. 1 (2025): 159. https://doi.org/10.3390/ma18010159.

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Cementitious Capillary Crystallization Waterproofing Material (CCCW), as an efficient self-healing agent, can effectively repair damage in concrete structures, thereby extending their service life. To address the various types of damage encountered in practical engineering applications, this study investigates the impact of different mixing methods for CCCW (including internal mixing, curing, and post-crack repair) on the multi-dimensional self-healing performance of concrete. The self-healing capacity of concrete was evaluated through water pressure damage self-healing tests, freeze–thaw dama

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16

Yang, Chang, and Wu. "Damage Indexing Method for Shear Critical Tubular Reinforced Concrete Structures based on Crack Image Analysis." Sensors 19, no. 19 (2019): 4304. http://dx.doi.org/10.3390/s19194304.

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Image analysis techniques have been applied to measure the displacements, strain field, and crack distribution of structures in the laboratory environment, and present strong potential for use in structural health monitoring applications. Compared with accelerometers, image analysis is good at monitoring area-based responses, such as crack patterns at critical regions of reinforced concrete (RC) structures. While the quantitative relationship between cracks and structural damage depends on many factors, cracks need to be detected and quantified in an automatic manner for further investigation

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17

Liu, Guangyan, Song Mu, Jingshun Cai, Deqing Xie, Ying Zhou, and Xiaocheng Zhou. "Influence of Crack on Concrete Damage in Salt-Freezing Environment." Advances in Materials Science and Engineering 2021 (June 16, 2021): 1–13. http://dx.doi.org/10.1155/2021/5543286.

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The damage development trend of concrete with cracks in salt-freezing environment is systematically studied. The cracks are also tested in intact concrete for comparison, and crack characterization is introduced. The mass loss, the relative dynamic elastic modulus, and the change of crack width are analyzed. Results show that the crack width increases as the salt-freezing cycle progresses. Following the development trend of the cracks, concrete cracks can be divided into three categories: 0–40, 40–100, and 100–150 μm. The mass loss increases significantly, and the change of relative dynamic el

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18

Abdi, F., Y. Xue, M. Garg, B. Farahmand, J. Housner, and K. Nikbin. "An analysis approach toward FAA certification for damage tolerance of aircraft components." Aeronautical Journal 118, no. 1200 (2014): 181–96. http://dx.doi.org/10.1017/s0001924000009064.

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Abstract This paper presents a novel analysis approach by considering multiple crack interaction in achieving FAA certification for durability and damage tolerance of exterior attachment installations on an aircraft fuselage according to FAA policy on Certification by Analysis-Supported-by-Test (CAST). Durability and damage tolerance evaluation of an aircraft component requires assessment of damage initiation and fatigue crack propagations under service loading, which consists of complex loading types, paths and variable amplitudes. Both simulation and service experience showed that multiple c

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19

Zhang, Xiao Chun, Feng Mei Sun, Yuan Wang, and Ning Zhang. "Fracture Mechanics Analysis of Hydraulic Cracks in Asphalt Pavement." Applied Mechanics and Materials 138-139 (November 2011): 478–83. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.478.

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Water damage in asphalt pavement is related to the interaction between cracks and hydrodynamic pressures caused by the vehicle. A 3D finite element model of the hydraulic crack in asphalt pavement was built to analyze the crack propagation character under vehicle load. The influence of asphalt pavement structure parameters, vehicle speed and crack geometric parameters of hydraulic crack were discussed. Then the differences, between aqueous cracks and cracks without water, were compared. The research results had the guiding meaning for anti-water damage design of asphalt pavement.

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Li, Qingwen, Chuangchuang Pan, Yuqi Zhong, et al. "Study on the damage constitutive characteristics of coal-rock composites under uniaxial compression: Influence of prefabricated crack angle and geometric dimensions." PLOS ONE 20, no. 3 (2025): e0316586. https://doi.org/10.1371/journal.pone.0316586.

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In coal mining environments with complex topographic and geological conditions, the presence of primary cracks in the rock strata of the upper mining airspace is critical to mine safety, especially when roof slabs are broken. Cracked roof slabs not only increase risks during mining but also make mining operations more challenging. Therefore, studying the initial damage state of the roof rock formation is great significance. In this study, the effects of different prefabricated crack sizes and inclination angles on the mechanical properties of the coal-rock composite containing cracks were anal

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21

Xi, Liang, Xiu Li Zhao, Chong Wei Shang, Guang Ming Kong, and Si Yu Zhou. "Localised Corrosion Damage Based Fatigue Crack Extension Model of Aluminium Alloy with Prior Corrosion Damage." Applied Mechanics and Materials 713-715 (January 2015): 2750–53. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2750.

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A modified model was presented for describing corrosion fatigue crack growth rate of aluminum alloy accurately. Considering the local damage around the crack tip is more reasonable for accelerating crack growth rate under corrosive environment, a damaged influence factors which characterize the damage degree of local damage near the crack tip has been introduced to revise the corrosion fatigue crack growth rate, and the experimental results are in good agreement with predictions of amendment fatigue crack growth rate model. The proposed model based on damaged influence factors is reasonable, a

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Jia, Baohui, Haijian Xiao, Jiachen Fang, and Zezhong Shan. "Uncertainty Analysis of multi-site damage Crack Propagation Based on the Monte Carlo Method." Journal of Physics: Conference Series 2252, no. 1 (2022): 012047. http://dx.doi.org/10.1088/1742-6596/2252/1/012047.

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Abstract Widespread fatigue damage is one of the main damages of aging aircraft structures, and the problem of multi-site damage has always been a research hotspot in engineering analysis. The traditional probabilistic model for calculating the growth rate of multiple cracks takes into account the multiple uncertain parameters that affect each other’s cracks. However, when solving the multi-site damage (MSD) crack growth problem, the traditional random model needs to solve multiple nonlinear equations. This method becomes no longer applicable. Based on the statistical point of view, this study

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Jia, Baohui, Haijian Xiao, Jiachen Fang, and Zezhong Shan. "Uncertainty Analysis of multi-site damage Crack Propagation Based on the Monte Carlo Method." Journal of Physics: Conference Series 2252, no. 1 (2022): 012047. http://dx.doi.org/10.1088/1742-6596/2252/1/012047.

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Abstract Widespread fatigue damage is one of the main damages of aging aircraft structures, and the problem of multi-site damage has always been a research hotspot in engineering analysis. The traditional probabilistic model for calculating the growth rate of multiple cracks takes into account the multiple uncertain parameters that affect each other’s cracks. However, when solving the multi-site damage (MSD) crack growth problem, the traditional random model needs to solve multiple nonlinear equations. This method becomes no longer applicable. Based on the statistical point of view, this study

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Du, Jianhuan, Xianxing Dai, Qingyang Liu, and Zhu Fu. "Toughening Effect of Micro-Cracks on Low-Temperature Crack Propagation in Asphalt Concrete." Materials 18, no. 11 (2025): 2429. https://doi.org/10.3390/ma18112429.

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Asphalt concrete has a unique low-temperature fracture mechanism due to the complex interaction between macro- and micro-cracks. This study investigated the toughening effect of micro-cracks on the crack propagation behavior of asphalt concrete at low temperatures. The Taylor model was applied to establish a modulus damage model of asphalt concrete. In combination with the discrete element method (DEM), a 2D microstructure damage model of asphalt concrete with heterogeneity (aggregate, mortar, and voids) and multi-level (aggregate gradation) characteristics was constructed. A virtual semi-circ

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Chen, Zixiao, Qian Chen, Zexu Dai, Chenghao Song, and Xiaobin Hu. "Seismic Damage Quantification of RC Short Columns from Crack Images Using the Enhanced U-Net." Buildings 15, no. 3 (2025): 322. https://doi.org/10.3390/buildings15030322.

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It is of great importance to quantify the seismic damage of reinforced concrete (RC) short columns since they often experience severe damage due to likely excessive shear deformation. In this paper, the seismic damage quantification method of RC short columns under earthquakes is proposed based on crack images and the enhanced U-Net. To this end, RC short-column specimens were prepared and tested under cyclic loading. The force-displacement hysteresis curves were obtained to quantitatively calculate the damage indicator of the RC short column based on the energy criterion. At the same time, cr

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Fang, Hui, and Na He. "Detection Method of Cracks in Expressway Asphalt Pavement Based on Digital Image Processing Technology." Applied Sciences 13, no. 22 (2023): 12270. http://dx.doi.org/10.3390/app132212270.

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Considering the limitations of the current pavement crack damage detection methods, this study proposes a method based on digital image processing technology for detecting highway asphalt pavement crack damage. Firstly, a non-subsampled contourlet transform is used to enhance the image of highway asphalt pavement. Secondly, the non-crack regions in the image are screened, and the crack extraction is completed by obtaining and enhancing the crack intensity map. Finally, the features of cracks are extracted and input into the support vector machine for classification and recognition to complete

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Guo, Jia, Deqing Guan, and Yanran Pan. "Research on Damage Identification of Nonuniform Microcrack in Beam Structures." Advances in Civil Engineering 2021 (January 18, 2021): 1–21. http://dx.doi.org/10.1155/2021/8877821.

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Nonuniform microcrack identification is of great significance in mechanical, aerospace, and civil engineering. In this study, the nonuniform crack is simplified as a semielliptical crack, and simplified calculation methods are proposed for damage severity and damage identification of semielliptical cracks. The proposed methods are based on the calculation method for uniform cracks. The wavelet transform and the intelligent algorithm (IA) are used to identify the damage location and the damage severity of the structure, respectively. The singularity of the wavelet coefficient can be used to ide

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Jin, Wencheng, and Chloé Arson. "Micromechanics based discrete damage model with multiple non-smooth yield surfaces: Theoretical formulation, numerical implementation and engineering applications." International Journal of Damage Mechanics 27, no. 5 (2017): 611–39. http://dx.doi.org/10.1177/1056789517695872.

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The discrete damage model presented in this paper accounts for 42 non-interacting crack microplanes directions. At the scale of the representative volume element, the free enthalpy is the sum of the elastic energy stored in the non-damaged bulk material and in the displacement jumps at crack faces. Closed cracks propagate in the pure mode II, whereas open cracks propagate in the mixed mode (I/II). The elastic domain is at the intersection of the yield surfaces of the activated crack families, and thus describes a non-smooth surface. In order to solve for the 42 crack densities, a Closest Point

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Makris, Ruben, Falk Hille, Marc Thiele, Dirk Kirschberger, and Damian Sowietzki. "Crack luminescence as an innovative method for detection of fatigue damage." Journal of Sensors and Sensor Systems 7, no. 1 (2018): 259–66. http://dx.doi.org/10.5194/jsss-7-259-2018.

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Abstract. Conventional non-destructive testing methods for crack detection provide just a snapshot of fatigue crack evolution at a specific location in the moment of examination. The crack luminescence coating realizes a clear visibility of the entire crack formation. The coating consists of two layers with different properties and functions. The bottom layer emits light as fluorescence under UV radiation. The top layer covers the fluorescing one and prevents the emitting of light in case of no damage at the surface. Several different experiments show that due to the sensitive coating even the

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Beijing, Xie, Dihao Ai, and Yu Yang. "Crack Detection and Evolution Law for Rock Mass under SHPB Impact Tests." Shock and Vibration 2019 (January 20, 2019): 1–12. http://dx.doi.org/10.1155/2019/3956749.

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In order to accurately identify and quantitatively calculate the surface cracks of rock mass under SHPB impact loading, an automatic crack detection algorithm was proposed and evaluated by the experiment. In SHPB experiment, cracks on the rock surface can effectively reflect its current state and better analyze the damage process. Firstly, the SHPB system was used to impact 12 groups of rock specimens under different impact velocities. A high-frame camera with 50,000 FPS was used to capture the damage process of the rock mass; using the manual annotation method, we got a dataset of SHPB damage

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Haiyang, Yuan, Wu Yunxin, and Liao Zhiqi. "A Damage Tolerance Model for Plates with Surface Cracks Under Combined End Force and Bending." Open Mechanical Engineering Journal 8, no. 1 (2014): 562–66. http://dx.doi.org/10.2174/1874155x01408010562.

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Reference stress statuses and the critical crack sizes are analyzed systematically and in detail for rectangle surface cracks in plates under combined endforce and cross-thickness bending loads via the ‘global’ reference stress method. The relationships of critical crack width and depth are obtained from the critical crack sizes analysis. Based on the net-section plastic collapse of the flawed component, a damage tolerance mathematical model for plates with single crack was built, which did not consider the contact of crack faces and it can be used for plates with a shallow crack or a deep cra

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Bolf, Davor, Albert Zamarin, and Robert Basan. "Composite Material Damage Processes." Journal of Maritime & Transportation Science 3, no. 3 (2020): 307–23. http://dx.doi.org/10.18048/2020.00.23.

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Composite materials are in use in the shipbuilding industry for a long period of time. Composites appear in vast number of fibre – matrix combinations and can be produced with several different production processes. Due to the specific nature of the composite material structure, the selection of the production process and the limitations in the quality control procedures, composite materials will always be subject to defects and imperfections which may, under certain circumstances, lead to the appearance and propagation of cracks. The size and the shape of the crack, the load type and the stre

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Yu, Shengjie, Di Gai, Lei Zhang, Zheng Zhao, Zhipeng Yao, and Shiyu Yang. "Simulation of tensile fatigue crack propagation in carbon fiber unidirectional laminates under progressive fatigue damage model." Journal of Physics: Conference Series 2783, no. 1 (2024): 012052. http://dx.doi.org/10.1088/1742-6596/2783/1/012052.

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Abstract This paper predicts and analyzes the tensile fatigue crack propagation of carbon fiber reinforced unidirectional laminates at high-stress levels using the carbon fiber stiffness strength degradation formula. The results show that different paving modes significantly affect crack propagation and stress distribution. Under the 45° layup, two cracks appeared. The upper crack expanded along the fiber direction, and the lower crack first appeared as a horizontal crack at the constrained end and then along the fiber direction. Under 0° layering, vertical cracks appear at the prefabricated c

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Vasudevan, A. K., K. Sadananda, and P. S. Pao. "Residual stress affecting environmental damage in 7075-T651 alloy." Corrosion Reviews 37, no. 5 (2019): 483–97. http://dx.doi.org/10.1515/corrrev-2019-0018.

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AbstractThe role of tensile overload superimposed on a constant amplitude cycling results in compressive residual stresses at the crack tip that cause crack growth retardation. The degree to which this effect manifests depends on whether the tests are done at a constant driving force (Kmax) or at a constant crack growth rate (da/dN). It is observed that depending on the magnitude of the overload at a given applied base stress intensity, these residual stresses can have significant effect on the crack growth in both the inert (vacuum) and the chemical (NaCl) environments. In general, cracks wil

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Xie, Ming, Zhangdong Wang, Li’e Yin, Fangbo Xu, Xiangdong Wu, and Mengqi Xu. "Study on Fractal Damage of Concrete Cracks Based on U-Net." Buildings 14, no. 10 (2024): 3262. http://dx.doi.org/10.3390/buildings14103262.

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The damage degree of a reinforced concrete structure is closely related to the generation and expansion of cracks. However, the traditional damage assessment methods of reinforced concrete structures have defects, including low efficiency of crack detection, low accuracy of crack extraction, and dependence on the experience of inspectors to evaluate the damage of structures. Because of the above problems, this paper proposes a damage assessment method for concrete members combining the U-Net convolutional neural network and crack fractal features. Firstly, the collected test crack images are i

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Dahak, Mustapha, Noureddine Touat, and Tarak Benkedjouh. "Crack Detection through the Change in the Normalized Frequency Shape." Vibration 1, no. 1 (2018): 56–68. http://dx.doi.org/10.3390/vibration1010005.

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The objective of this work is to use natural frequencies for the localization and quantification of cracks in beams. First, to study the effect of the crack on natural frequencies, a finite element model of Euler–Bernoulli is presented. Concerning the damaged element, the stiffness matrix is calculated by the theory of fracture mechanics, by inverting the flexibility matrix. Then, in order to detect damage, we are going to show that the shape given by the change in the natural frequencies is as function of the damage position only. Thus, the crack is located by the correlation between the shap

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Snyder, Scott A., Erland M. Schulson, and Carl E. Renshaw. "The role of damage and recrystallization in the elastic properties of columnar ice." Journal of Glaciology 61, no. 227 (2015): 461–80. http://dx.doi.org/10.3189/2015jog14j225.

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AbstractEffects of damage on elastic properties were studied in columnar-grained specimens of freshwater and saline ice, subjected, at −10°C, to varying levels of inelastic strain. The ice was compressed uniaxially at constant strain rates up to 0.20 strain, which caused localized recrystallization and imparted damage in the form of non-propagating cracks. Damage was quantified in terms of dimensionless crack density, which, along with recrystallized area fraction, was determined from thin sections. The change in porosity due to stress-induced cracks served as another indicator of damage. Elas

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He, Muyang, Chengwu Dong, Xiaodan Sun, and Jiayi He. "Fatigue Crack Monitoring Method Based on the Lamb Wave Damage Index." Materials 17, no. 15 (2024): 3836. http://dx.doi.org/10.3390/ma17153836.

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For practical engineering structures, fatigue is one of the main factors affecting their safety and durability. Under long-term service conditions, the minor damage will be affected by fatigue loading and expand to macroscopic cracks, affecting the structure’s service performance. Based on the sensitivity of Lamb waves to minor and initial damage, a damage monitoring method for fatigue crack propagation is proposed. By carrying out fatigue crack propagation tests under constant amplitude loading, the Paris equation of 316L steel and damage signals at different crack growth stages were obtained

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Xiang, Pengfei, Gang Wei, Haibo Jiang, Yongjie Qi, and Yangyang Liu. "Experimental Study on Failure Mechanisms of Shield Tunnel Segments with Initial Cracks Under Surcharge Loading." Symmetry 17, no. 7 (2025): 1036. https://doi.org/10.3390/sym17071036.

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Accidental ground surcharge loads can induce adverse effects such as segment cracking in underlying shield tunnel structures, with particularly pronounced impacts on pre-damaged tunnel segments. Cracks represent one of the most common initial damage forms in shield tunnel structures. To investigate through-crack failure mechanisms in shield tunnel segments with initial cracks under surcharge loading, this study conducted 1:8 scaled indoor model tests, considering factors including initial crack length, quantity, morphology, and surcharge position. Research findings demonstrate that increased i

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Wang, Fei, Xue Zeng Zhao, and Jia Ying Chen. "Detection of Multiple Cracks in Triangular Cantilevers Based on Frequency Measurements." Key Engineering Materials 324-325 (November 2006): 259–62. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.259.

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Triangular cantilevers are used as small force sensors. Prediction of location and size of multiple cracks from experimental results will be of value to users and designers of cantilever deflection force sensors. We extend a method for prediction of location and size of multiple cracks in rectangular cantilevers to deal with triangular cantilevers in this paper. The cracks are assumed to introduce local flexibility change and are modeled as rotational springs. The beam is divided into a number of segments, and each segment is associated with a damage index, which can be calculated through the

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Chandra, A., Y. Huang, Z. Q. Jiang, K. X. Hu, and G. Fu. "A Model of Crack Nucleation in Layered Electronic Assemblies Under Thermal Cycling." Journal of Electronic Packaging 122, no. 3 (1999): 220–26. http://dx.doi.org/10.1115/1.1286100.

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A model for crack nucleation in layered electronic assemblies under thermal cycling is developed in this paper. The present model includes three scales: (i) at the microscale or the mechanism level, the damage mechanisms such as diffusive void growth or fatigue cracks, determine the damage growth rate; (2) at an intermediate mesoscale, the localized damage bands are modeled as variable stiffness springs connecting undamaged materials; and (iii) at the macroscale or the continuum level, the localized damage band growing in an otherwise undamaged material is modeled as an array of dislocations.

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Zhou, Yangyang, and Wen Wang. "Study on Acoustic Emission Characteristics and Crack Evolution Characteristics of Conglomerate Under Uniaxial Compression." Academic Journal of Science and Technology 13, no. 3 (2024): 185–99. https://doi.org/10.54097/ryfv8s48.

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Taking the giant thick conglomerate in Yima mining area as the research background, this paper investigates the acoustic emission characteristics and crack evolution law of conglomerate with different grain sizes under loading conditions through uniaxial compression test and acoustic emission (AE) technology, and discusses the influence of grain size on its damage mechanism and damage evolution. The results show that : the AE energy and ringing counts of conglomerate specimens increase significantly with the increase of grain size, and large-grained conglomerates show stronger shear damage cha

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Govindasamy, Mahendran, Gopalakrishnan Kamalakannan, Chandrasekaran Kesavan, and Ganesh Kumar Meenashisundaram. "Damage Detection in Glass/Epoxy Laminated Composite Plates Using Modal Curvature for Structural Health Monitoring Applications." Journal of Composites Science 4, no. 4 (2020): 185. http://dx.doi.org/10.3390/jcs4040185.

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This paper deals with detection of macro-level crack type damage in rectangular E-Glass fiber/Epoxy resin (LY556) laminated composite plates using modal analysis. Composite plate-like structures are widely found in aerospace and automotive structural applications which are susceptible to damages. The formation of cracks in a structure that undergoes vibration may lead to catastrophic events such as structural failure, thus detection of such occurrences is considered necessary. In this research, a novel technique called as node-releasing technique in Finite Element Analysis (FEA), which was not

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Kwon, Y. W., and C. T. Liu. "Microstructural Effects on Damage Behaviour in Particle Reinforced Composites." Polymers and Polymer Composites 11, no. 1 (2003): 1–8. http://dx.doi.org/10.1177/096739110301100101.

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This paper discusses the effects of non-uniform, random particle distribution on damage initiation and growth, leading to short cracks and breakage of particle reinforced composite specimens. A multi-scale technique was employed to model and simulate damage. Damage was described at the constituent material level (i.e. micro-level) and the results were compared qualitatively and quantitatively with experimental observation. Both results agreed well. Non-uniform, random particle distribution yielded sporadic crack initiation and growth within a uniform tensile specimen. No local crack propagated

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Yang, Su Juan, and Hong Wang. "Analysis and Prevent Measure for Common Housing Construction Crack." Applied Mechanics and Materials 166-169 (May 2012): 1891–94. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1891.

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Introduces common of housing construction damage that result from crack, and analyzes main cause result in housing crack, then discusses how to ascertain cracks’ cause of formation in terms of crack form, and take what proper measure to prevent different cracks of housing construction.

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Takagaki, Masakazu, and Toshiya Nakamura. "Fatigue Crack Modeling and Simulation Based on Continuum Damage Mechanics." Journal of Pressure Vessel Technology 129, no. 1 (2006): 96–102. http://dx.doi.org/10.1115/1.2388993.

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Numerical simulation of fatigue crack propagation based on fracture mechanics and the conventional finite element method requires a huge amount of computational resources when the cracked structure shows a complicated condition such as the multiple site damage or thermal fatigue. The objective of the present study is to develop a simulation technique for fatigue crack propagation that can be applied to complex situations by employing the continuum damage mechanics (CDM). An anisotropic damage tensor is defined to model a macroscopic fatigue crack. The validity of the present theory is examined

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Ahmadi, Mohammad Hosein, and Hamed Molladavoodi. "Rock Failure Analysis under Dynamic Loading Based on a Micromechanical Damage Model." Civil Engineering Journal 4, no. 11 (2018): 2801. http://dx.doi.org/10.28991/cej-03091199.

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A micromechanical constitutive damage model accounting for micro-crack interactions was developed for brittle failure of rock materials under compressive dynamic loading. The proposed model incorporates pre-existing flaws and micro-cracks that have same size with specific orientation. Frictional sliding on micro-cracks leading to inelastic deformation is very influential mechanism resulting in damage occurrence due to nucleation of wing-crack from both sides of pre-existing micro-cracks. Several homogenization schemes including dilute, Mori-Tanaka, self-consistence, Ponte-Castandea & Willi

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Božić, Željko, Siegfried Schmauder та Marijo Mlikota. "Fatigue Growth Models for Multiple Long Cracks in Plates under Cyclic Tension Based on ΔK_I, ΔJ-Integral and ΔCTOD Parameter". Key Engineering Materials 488-489 (вересень 2011): 525–28. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.525.

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This paper presents the implementation of fatigue crack growth power law equations based on ΔK,ΔJ-integral andΔCTODfracture mechanics parameters determined in an FE analysis, to plates with multiple site damage (MSD). Results of fatigue tests with constant amplitude tensile loading carried out on mild steel plate specimens damaged with a single central crack and with three collinear cracks are presented. A relatively larger plastic zone occurred in the crack tip region at higher fatigue crack growth rate (FCGR), from 10-7to 10-6m/cycle. The crack growth models based on the elastic-plastic frac

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Mughrabi, Haël. "Microstructural mechanisms of cyclic deformation, fatigue crack initiation and early crack growth." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2038 (2015): 20140132. http://dx.doi.org/10.1098/rsta.2014.0132.

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In this survey, the origin of fatigue crack initiation and damage evolution in different metallic materials is discussed with emphasis on the responsible microstructural mechanisms. After a historical introduction, the stages of cyclic deformation which precede the onset of fatigue damage are reviewed. Different types of cyclic slip irreversibilities in the bulk that eventually lead to the initiation of fatigue cracks are discussed. Examples of trans- and intercrystalline fatigue damage evolution in the low cycle, high cycle and ultrahigh cycle fatigue regimes in mono- and polycrystalline face

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Chen, Ruling. "Migration Learning-Based Bridge Structure Damage Detection Algorithm." Scientific Programming 2021 (December 17, 2021): 1–10. http://dx.doi.org/10.1155/2021/1102521.

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Most of the bridge structures in the world are built of reinforced concrete. With the growth of service life and the increase of urban traffic and other factors, most bridges put into service have more or less damage. Traditional bridge damage detection methods include the manual inspection method and bridge inspection vehicle method, which have many shortcomings. Moreover, the detection of cracks in bridges is critical to the safety of transportation due to the extremely large number of bridges built in the road networks across the world. To this end, this paper uses the most widely used CNN

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