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Journal articles on the topic 'Crack control'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Luo, Dan, and Li Zhe Luo. "Study and Engineering Practice on Cracks Control Measures for Concrete Face Slab of High CFRD." Advanced Materials Research 455-456 (January 2012): 1606–11. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1606.

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Being the face slabs of high concrete faced rockfill dams (CFRD) are under complex stress state, the slabs are relative vulnerable. And crack is easy to form on slab, which can influence durability and integrity, then weaken impermeable ability and safety of dam. The factors that contribute to the structural cracks, non-structural cracks and extruding cracks of concrete face-slab are analyzed in detail. The result shows that the structural crack is mainly due to differential settlement, the extruding crack in riverbed position is mainly caused by rockfill body over-settlement of dam beyond 150

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2

Ngiam, Shi Song, and Feargal P. Brennan. "Fatigue Crack Control in Structural Details Using Surface Peening." Journal of Ship Production 24, no. 03 (2008): 147–51. http://dx.doi.org/10.5957/jsp.2008.24.3.147.

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This paper presents an analytical and experimental study of crack shape evolution in steel plate specimens under cyclic loading. It is widely known that the introduction of compressive residual stresses by cold working the surface can be highly beneficial in improving the fatigue performance of structural components. Although it is recognized that relaxation of surface compressive residual stress can reduce the potential benefits, the effects of residual stress on crack shape evolution are often overlooked. Previous studies have shown that the intensity of the surface compressive residual stre

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3

Leonhardt, Fritz. "Cracks and Crack Control in Concrete Structures." PCI Journal 33, no. 4 (1988): 124–45. http://dx.doi.org/10.15554/pcij.07011988.124.145.

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4

Yan, Jing, Hong Yang, and Feng Liu. "Causes and Control of Crack in Residential Building Designing." Advanced Materials Research 255-260 (May 2011): 709–13. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.709.

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With the development of commercial concrete, the problem of crack has become a difficulty puzzling the engineers. From the view of design ,this paper discussed specially on the problem of residential building’s crack, analysed some faulty and incomplete acts which will cause cracks ,and presented some corresponding control measures.

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5

SHOJAEE, S., M. ASGHARZADEH, and A. HAERI. "CRACK ANALYSIS IN ORTHOTROPIC MEDIA USING COMBINATION OF ISOGEOMETRIC ANALYSIS AND EXTENDED FINITE ELEMENT." International Journal of Applied Mechanics 06, no. 06 (2014): 1450068. http://dx.doi.org/10.1142/s1758825114500689.

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The main contribution of this paper is to propose an IGA formulation to model stationary cracks within orthotropic media by combination of XFEM enrichment functions and level set functions. For modeling cracks in solution field crack face and crack tips are considered separately and the control points that are related to each part are enriched with different approaches. The control points related with the crack face are enriched using the Heaviside enrichment functions. Level set functions are used to distinguish the control points correspond to crack tips and crack face. Stress intensity fact

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6

Fu, Ya Nan, and Ze Ping He. "Concrete Crack Control Technology in Chongqing Inch Container Terminal Box Letter of Application in Engineering." Applied Mechanics and Materials 217-219 (November 2012): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.161.

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This paper mainly introduces the main causes of the concrete cracks, and with Chongqing inch beach bonded port freight container terminal, drain tank letter concrete crack control as the engineering example, the paper analyzes the method of crack control. For example reduce water consumption, choose the narrow fly ash cement, reduce the narrow concrete constraint, and control the hydration heat, strengthen the concrete curing, control the steel corrosion of crack, control the box by letter of the surrounding rock deformation, they can be reached that box culverts basic don't crack effect.

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7

Li, Mingke, Kepeng Huang, and Xuemei Yi. "Crack Formation Mechanisms and Control Methods of Laser Cladding Coatings: A Review." Coatings 13, no. 6 (2023): 1117. http://dx.doi.org/10.3390/coatings13061117.

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Laser cladding, a novel surface treatment technology, utilizes a high-energy laser beam to melt diverse alloy compositions and form a specialized alloy-cladding layer on the surface of the substrate to enhance its property. However, it can generate substantial residual stresses during the rapid cooling and heating stages, due to inadequate selection of cladding process parameters and disparities in thermophysical properties between the clad layer and substrate material, leading to the formation of various types of cracks. These cracks can significantly impact the quality and performance of the

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8

Navrátil, Jaroslav, and Radim Čajka. "Crack Control in Reinforced Concrete Liquid Retaining Structures." Materials Science Forum 893 (March 2017): 410–15. http://dx.doi.org/10.4028/www.scientific.net/msf.893.410.

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The paper deals with the calculation and assessment of the crack width and crack resistance of reinforced concrete tanks for liquids and containers according to Eurocode. Detailed analysis of the provisions of EN 1992-3 related to the calculation of cracks is made. The interpretation of code provisions used in IDEA StatiCa software is explained. Comparative calculations are executed for standard reinforced concrete and fiber concrete cross-sections.

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9

Guan, Jun Feng, Yu Hu, Shun Bo Zhao, et al. "Research on the Crack Stability of Dam Concrete Based on the Measured Monitoring Data." Advanced Materials Research 250-253 (May 2011): 2713–18. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2713.

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This paper proposes a theoretical expression for the ultimate relationship between the crack gauge monitoring data and steel stress gauge ones in dam concrete, based on the equation for crack width of reinforced concrete member, when the cracks expanded to the crack-control steel. In addition, a practical method is developed for analyzing and determining the crack stability of dam concrete, which predicts whether a crack elongated to the crack-control steel or not by comparing the observed values to the theoretical ultimate value. The provided method is proven to be proper to evaluate the crac

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10

Yu, Meilin. "Mechanism and control strategy of large-area concrete shrinkage cracks in the underground railway section." MATEC Web of Conferences 382 (2023): 01016. http://dx.doi.org/10.1051/matecconf/202338201016.

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The cracks of the large-area concrete structure in the underground railway section directly affect the structural safety and service life. How to take effective measures to control concrete shrinkage cracks is a difficulty to be solved in the project.In view of the crack control demand of large-area concrete structure cracks in a vehicle section of Wuhan metro, based on the existing engineering cases of large-area concrete structure, shrinkage crack mechanism and control strategies, the corresponding measures are proposed to prevent crack production from two aspects of concrete raw materials a

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11

Chomette, B., and J.-J. Sinou. "Crack detection based on optimal control." Journal of Vibration and Control 18, no. 11 (2012): 1737–49. http://dx.doi.org/10.1177/1077546311429839.

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Techniques for optimal control to increase system security attract a great deal of interest from industry. The presence of transversal cracks can considerably modify the dynamics of a system. In the case of closed-loop systems, i.e. controlled systems, these faults can cause the destabilization and variation of control performance. Consequently, such variations can be used to detect transversal cracks. Therefore, the present study proposes an investigation into the possibility of detecting structure modification based on estimated control performance by using the Rational Fraction Polynomial a

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12

Yoon-Si, Lee, and Maharjan Sadit. "End-Region Cracking in Prestressed Concrete Girders and It's Solution." Journal of Civil and Construction Engineering (e-ISSN: 2457-001X) 5, no. 3 (2019): 15–27. https://doi.org/10.5281/zenodo.3386658.

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As end region cracks in prestressed concrete girders have become prevalent in recent years with the use of high strength concrete, large prestressing force, slender webs and deep sections, engineers and precast manufacturers have spent considerable time and effort researching viable solutions to control or prevent these cracks. While minor cracks can simply be patched, adequate and immediate actions need to be taken if cracks are noticeably wide and deep, especially around the prestressing strands, because they may pose structural durability concerns. This study presents some of the widely use

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13

Wang, Jiu Jun. "A Brief Analysis of the Floor Crack." Applied Mechanics and Materials 395-396 (September 2013): 533–35. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.533.

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people usually think that the cracks of cast-in-place floor slab is the inevitable phenomenon in theory, but by finding reason in some ways, it is completely possible that people determine the preventive measures to reduce and control the crack. When appearing cracks, people reduce the impact of crack in the lowest by correctly understanding and dealing with crack.

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14

Tong, Zhi Neng. "Causes and Control Measures of Cracks in Masonry Structure." Applied Mechanics and Materials 638-640 (September 2014): 24–26. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.24.

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This paper deeply analyses the classification and formation of cracks of masonry crack, puts forward the control of cracks in masonry structure and the concrete structure, and provide a useful reference for engineering construction personnel.

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15

Wu, Zhi Xue. "Shape Prediction of Fatigue Crack Based on a Given Stress Intensity Factor Distribution." Key Engineering Materials 353-358 (September 2007): 19–23. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.19.

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There is an inherent relationship between the shape and the corresponding stress intensity factor (SIF) distribution of a crack. A typical inverse problem of linear elastic fracture mechanics about a crack, i.e. to predict the shape of a crack assuming that some information of SIF distribution is known, is presented. A finite-element based numerical procedure is used to determine the shape, correspondingly the SIF, of a mode-I planar crack based on a specified SIF distribution. The crack front is modeled using cubic splines, which are determined by a number of control-points. The crack front s

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16

Wang, Dong Sheng, Zong Jun Tian, Li Da Shen, and Yin Hui Huang. "Preparation of Thick Ceramic Coating by Laser Multi-Layer Cladding I - Crack Control." Advanced Materials Research 785-786 (September 2013): 906–9. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.906.

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The formation of cracks is one of the key problems which restricts the development and application of laser-clad ceramic coating technique on metal surface, especially during laser multi-layer cladding process because of stress superposition effect. In this study, a thick ceramic coating was fabricated by laser multi-layer cladding based on series of crack control methods. The crack of clad layer was controlled by preheating and slow cooling rate of sample with incubator, applying the ultrasonic vibration and adopting closed-loop controlling temperature of molten pool during laser cladding pro

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17

Kashif, Muhammad, Ahsan Naseem, Nouman Iqbal, Pieter De Winne, and Hans De Backer. "Numerical Evaluation of Early-Age Crack Induction in Continuously Reinforced Concrete Pavement with Different Saw-Cut Dimensions Subjected to External Varying Temperature Field." Applied Sciences 11, no. 1 (2020): 42. http://dx.doi.org/10.3390/app11010042.

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Since 1970, continuously reinforced concrete pavements have been used in Belgium. The standard design concept for CRCP has been modified through several changes made in the design parameters to eliminate the cluster of closely spaced crack patterns, since these crack patterns lead to the development of spalling and punch-out distresses in CRCPs. Despite adjusting the longitudinal reinforcement ratio, slab thickness, and addition of asphalt interlayer, the narrowly spaced cracks could not be effectively removed. The application of transverse partial surface saw-cuts significantly reduced the pr

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18

Man, Xiaolan, Long Li, Hong Zhang, et al. "Study on the Relationship between Crack Initiation and Crack Bifurcation in Walnut Shells Based on Energy." Agriculture 14, no. 1 (2023): 69. http://dx.doi.org/10.3390/agriculture14010069.

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Clarifying the dissipated energy required for crack expansion is an effective way to control material crushing. Therefore, based on the material fracture probability model and fractal theory, the energy range required for crack extension was determined, and the morphology of the cracks was quantified. This study investigates the influence of walnut size on crack propagation characteristics; this includes its effects on the crack initiation threshold energy, representing resistance to crack initiation, and the crack bifurcation threshold energy, representing resistance to crack bifurcation. The

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19

Liu, Qi, Shancheng Cao, and Zhiwen Lu. "An Improved Crack Breathing Model and Its Application in Crack Identification for Rotors." Machines 11, no. 5 (2023): 569. http://dx.doi.org/10.3390/machines11050569.

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The crack breathing model and crack identification method for rotors using nonlinearity induced by cracks are studied in this work. Firstly, the finite element method is utilized to model a rotor–bearing system with a response-dependent breathing crack to obtain the numerical data for crack identification. During the modelling, an improved breathing crack model is proposed, focused on the unreasonable assumption about crack closure line in the original crack closure line position (CCLP) model. Compared with the original model, the improved breathing model can reflect the nonlinear behavior of

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20

Wang, Zhen Hong, Guo Xin Zhang, and Shu Ping Yu. "Crack Mechanism, Temperature Control, and Anti-Cracking Measures of Sluice." Applied Mechanics and Materials 405-408 (September 2013): 1217–20. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1217.

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To address the problem of sluice concrete easily cracking during construction, this study introduces the crack mechanism of concrete structures. Temperature differences and constraints are the main causes of cracks. Anti-cracking measures should focus on optimizing concrete mixing ratio and improving construction technology. Using simulation calculation to model the actual construction process and temperature control measures, this study analyzes the causes of crack and selects timely and reasonable temperature control measures, which are necessary links in engineering construction. A three-di

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21

Li, Xu, Gangjun Li, and Zhuming Bi. "Digital Twins to Predict Crack Propagation of Sustainable Engineering Materials under Different Loads." Machines 12, no. 2 (2024): 125. http://dx.doi.org/10.3390/machines12020125.

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Computer-aided engineering (CAE) is an essential tool in a digital twin not only to verify and validate a virtual twin before it is transformed into a physical twin, but also to monitor the use of the physical twin for enhanced sustainability. This paper aims to develop a CAE model for a digital twin to predict the fatigue life of materials. Fatigue damage is represented by the size of a macro-crack that grows with a cluster of micro-cracks subjected to three different loads. The growth angle is related to the maximum circumferential tensile stress, and the growth rate is determined by the str

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22

Lazarev, N. P. "Optimal control of transverse crack length in the equilibrium problem of Timoshenko plate with two intersecting cracks." Vestnik Udmurtskogo Universiteta. Matematika. Mekhanika. Komp'yuternye Nauki 35, no. 2 (2025): 247–60. https://doi.org/10.35634/vm250206.

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A mathematical model of the equilibrium of an elastic plate with two mutually intersecting cracks is considered. One of the cracks is described by a part of the plane perpendicular to the midplane of the plate, and the other is specified by a smooth curve in the midplane. The nonlinearity of the problem is due to the non-penetration conditions in the form of inequalities imposed on the curves corresponding to the cracks. An analysis is made of the dependence of solutions of a family of variational inequalities on a parameter characterizing the variation of the length of a rectilinear crack. Ba

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23

Solass, Johannes, Silvin Schapfel, and Alexander Stolz. "Using 3D-Printed Formwork to Enable Controlled Crack Creation in Concrete Specimens." CivilEng 6, no. 1 (2025): 10. https://doi.org/10.3390/civileng6010010.

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The employment of automated non-destructive testing (NDT) methods for crack characterization in concrete, needs calibration and benchmarking in a controlled environment. This requires test specimen with comparable and ideally reproducible cracks. To this end, in this paper a method is presented that aims to mimic cracked concrete specimens with a high degree of control over the resulting crack parameters width, depth and length for material testing and calibration of automated (NDT) methods. The method comprises 3D-printing of formwork with integrated crack patterns. The obtained crack width a

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24

Li, Lin, Jin Sha Jiao, Shu Mei Fei, Hai Tao Lin, and Quan Fa Cui. "Updated Research Result on Transverse Corner Crack of Slab." Advanced Materials Research 744 (August 2013): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amr.744.273.

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To introduce feature and microstructure of edge crack of rolled coil, character and distribution of transverse corner crack of continuous cast slab (hereafter referred to as transverse corner crack), trace out rolling process of defective continuous cast slab, transverse corner crack of slab causes edge crack of rolled coil, the corner inclusions of slab and rolling process are also significant factors. To give some suggestions to resolve two dimensional heat transfer and high cooling intensity about control of transverse corner cracks. Inclusions cause stress concentration to lead to edge cra

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25

Wang, Zi Zhen, Ri He Wang, Yu Huan Bu, and Xun Shan. "A New Method of Preparing Artificial Cores with Certain Cracks for Experiment Study of Elastic Wave Propagation." Advanced Materials Research 356-360 (October 2011): 2954–57. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2954.

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Crack universally existing underground is an important kind of pores. In order to study the elastic wave propagation in fractured medium through experiment, a new method to make artificial core with certain cracks using oil well cement and camphor sheet or thin steel sheet is put forward. Geometric parameters of the crack, such as shape, size and aspect ratio, are approximately equal to that of camphor sheet or thin steel sheet. Using the thin steel sheet to make crack can be more easy and accurate to control the crack angle than using camphor sheet. The crack opening scales at millimeters. Th

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Zou, Yulin, Hao Bai, Fan Shen, Hong Xu, and Yundong Shou. "Experimental Investigation on Effects of Bacterial Concentration, Crack Inclination Angle, Crack Roughness, and Crack Opening on the Fracture Permeability Using Microbially Induced Carbonate Precipitation." Advances in Civil Engineering 2021 (July 7, 2021): 1–15. http://dx.doi.org/10.1155/2021/4959229.

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Uncontrollable leakage has significant effects on the safety of fractured rock mass, and microbially induced carbonate precipitation (MICP) is an effective way to control the seepage. In this study, four sets of seepage experiments are conducted on transparent rock-like specimens containing MICP filled single cracks to investigate the effects of bacterial concentration, crack inclination angle, crack roughness, and crack opening on fracture permeability. The experimental results show that calcium carbonate precipitation is produced when Sporosarcina pasteurii and cementing fluid are injected i

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27

Li, Jianyu, and Bowen Sun. "Prevention And Control of Mass Concrete Cracks in Building Construction Engineering." Highlights in Science, Engineering and Technology 51 (May 16, 2023): 137–41. http://dx.doi.org/10.54097/hset.v51i.8251.

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As a kind of building material, mass concrete plays an important role in building construction. It is widely used in engineering projects and needs to be controlled in many aspects, otherwise cracks may appear and affect the safety and performance of the project. In this paper, the crack problems of mass concrete structures are studied and analyzed, such as cracks caused by mix ratio, temperature change, foundation deformation. Firstly, by understanding the internal and external causes of cracks in mass concrete, the key issues were suggested. Then, the method to prevent and control the crack

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28

Zelenyak, Volodymyr. "Mathematical Modelling of Stationary Thermoelastic State for a Plate with Periodic System of Inclusions and Cracks." Acta Mechanica et Automatica 13, no. 1 (2019): 11–15. http://dx.doi.org/10.2478/ama-2019-0002.

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Abstract Two-dimensional stationary problem of heat conduction and thermoelasticity for infinite elastic body containing periodic system of inclusions and cracks is considered. Solution of the problem is constructed using the method of singular integral equations (SIEs). The numerical solution of the system integral equations are obtained by the method of mechanical quadrature for a plate heated by a heat flow, containing periodic system elliptic inclusions and thermally insulated cracks. There are obtained graphic dependences of stress intensity factors (SIFs), which characterise the distribu

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29

Wicke, Marcel, Angelika Brueckner-Foit, Tina Kirsten, Martina Zimmermann, Fatih Buelbuel, and Hans-Juergen Christ. "Understanding the near-threshold crack growth behavior in an aluminum alloy by x-ray tomography." MATEC Web of Conferences 165 (2018): 13007. http://dx.doi.org/10.1051/matecconf/201816513007.

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The near-threshold behavior of long cracks is evaluated using pre-cracked flat dogbone specimens of a commercial aluminum alloy in two heat treatment states. Once the threshold was known, the crack initially introduced by cyclic compression was propagated under load control with approximately constant range of the stress intensity factor at values close to the threshold values. The 3D morphology of the crack and the spatial distribution of the primary precipitates obtained by μ-CT were reconstructed with the aim of analyzing the role of the microstructure and primary precipitates on crack grow

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30

Zawadzki, Paweł, and Rafał Talar. "Bone Abrasive Machining: Influence of Tool Geometry and Cortical Bone Anisotropic Structure on Crack Propagation." Journal of Functional Biomaterials 13, no. 3 (2022): 154. http://dx.doi.org/10.3390/jfb13030154.

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The abrasive machining of cortical tissue is used in many arthroplasties and craniofacial surgery procedures. However, this method requires further research due to the processes’ complexity and the tissue’s composite structure. Therefore, studies were carried out to assess the impact of grid geometry and the anisotropic structure of bone tissue on the cutting process and crack propagation. The analysis was performed based on an orthogonal cutting in three directions. The grain shape has been simplified, and the cutting forces, crack path and surface quality were monitored. The results indicate

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31

Huang, Yaoying. "Optimization of Temperature-Control Measures for Concrete Structures: A Case Study of the Sluice Project." Advances in Civil Engineering 2018 (July 15, 2018): 1–8. http://dx.doi.org/10.1155/2018/4823130.

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Temperature control and crack prevention in sluice pier concrete is a key issue in the early design and construction period. Strong surface insulation may lead to cracks after formwork removal, while weak surface insulation may result in a high crack risk in the early age. The water-cooling measure may also cause severe cracks at a rapid cooling rate. Therefore, the optimum temperature control scheme should be comparatively studied against the alternatives. In this paper, we investigate crack prevention in sluice pier concrete as a multiple-factor system optimization problem and investigate an

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32

Cui, Wei, Zhongmin Xiao, Jie Yang, Mi Tian, Qiang Zhang, and Ziming Feng. "Multi-Crack Dynamic Interaction Effect on Oil and Gas Pipeline Weld Joints Based on VCCT." Energies 15, no. 8 (2022): 2812. http://dx.doi.org/10.3390/en15082812.

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In pipelines for transporting oil and gas, multiple cracks often exist in weld joints. The interaction among the cracks should be considered as it directly affects the life span of the pipeline structures. In the current investigation, based on the fluid–solid magnetic coupling model, the virtual crack-closure technique (VCCT) is applied to systematically study the multi-crack dynamic interaction effect on pipeline welds during the crack propagation process. The results show that the existence of an auxiliary crack accelerates the main crack’s propagation. When the auxiliary crack is nearer to

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Kasapi, M. A., and J. M. Gosline. "Design complexity and fracture control in the equine hoof wall." Journal of Experimental Biology 200, no. 11 (1997): 1639–59. http://dx.doi.org/10.1242/jeb.200.11.1639.

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Morphological and mechanical studies were conducted on samples of equine hoof wall to help elucidate the relationship between form and function of this complex, hierarchically organized structure. Morphological findings indicated a dependence of tubule size, shape and helical alignment of intermediate filaments (IFs) within the lamellae on the position through the wall thickness. The plane of the intertubular IFs changed from perpendicular to the tubule axis in the inner wall to almost parallel to the tubule axis in the outer wall. Morphological data predicted the existence of three crack dive

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Shi, Bei-xiao, Cheng-feng Zheng, and Jin-kun Wu. "Research Progress on Expansive Soil Cracks under Changing Environment." Scientific World Journal 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/816759.

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Engineering problems shunned previously rise to the surface gradually with the activities of reforming the natural world in depth, the problem of expansive soil crack under the changing environment becoming a control factor of expansive soil slope stability. The problem of expansive soil crack has gradually become a research hotspot, elaborates the occurrence and development of cracks from the basic properties of expansive soil, and points out the role of controlling the crack of expansive soil strength. We summarize the existing research methods and results of expansive soil crack characteris

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Katikireddi, Vittal. "CRACK for birth control." BMJ 328, Suppl S3 (2004): 0403124. http://dx.doi.org/10.1136/sbmj.0403124.

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Nikolaev, Yu L., A. A. Samorukov, A. A. Borisenko, and A. N. Chesalin. "MAGNETIC CONTROL SYSTEM WITH TWO-COMPONENT VIBRATION-INDUCTION MAGNETIC FIELD TRANSDUCER." Kontrol'. Diagnostika, no. 311 (May 2024): 12–19. http://dx.doi.org/10.14489/td.2024.05.pp.012-019.

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The features of identifying and evaluating the parameters of surface cracks by the amplitude and phase change of the spectral components of the signals of a magnetic control system with a two-component vibration-induction primary transducer (VIT) are considered. The structure of the magnetic control system and the device of a two-component VIT are given. Spectral diagnostic signs of the signal of measuring information on the normal and tangential control channels during the movement of the VIT over the crack are determined. Estimates of the threshold sensitivity to small cracks, the depth of o

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37

Guo, Wei Tong, and Sheng Na Yang. "The Control Study of Mass Concrete Floor Temperature Crack." Advanced Materials Research 446-449 (January 2012): 3318–22. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.3318.

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Analysis the factors of mass concrete temperature crack. Combined with the Nan Yang Branch of CUCC cement clinker production line of the second phase of mass concrete construction, it proposed some measures about how to prevent the temperature stress crack of mass concrete due to hydration heat of cement generated temperature difference .By controlling the temperature of the concrete strictly, decreasing the temperature difference between inside and outside, preventing shrinkage joint, reducing the slump loss, delaying setting time, etc. To ensure from the construction maintaining process of m

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Peng, Yanyan, Xiao Cheng, Nan Song, Qi Qin, Xiaoyun Zhang, and Manchao He. "Study on Crack Propagation and Coalescence in Fractured Limestone Based on 3D-DIC Technology." Energies 15, no. 6 (2022): 2007. http://dx.doi.org/10.3390/en15062007.

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To deeply understand the influence of crack inclination angle on crack propagation and coalescence in fractured limestone, uniaxial compression tests were carried out on limestone specimens with prefabricated cracks. The strain field evolution diagram of the failure process of the specimens was obtained using 3D digital image correlation technology (3D-DIC technology). This, in combination with the crack propagation diagram, was used to analyze the entire failure process of the limestone specimens. The test results show that the evolution process of the principal strain field agrees well with

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Wu, Xu, Liyuan Zhang, Jinglai Sun, Qifeng Guo, Jiliang Pan, and Jun Gao. "Strength Characteristics and Failure Mechanism of Granite with Cross Cracks at Different Angles Based on DIC Method." Advances in Materials Science and Engineering 2022 (March 16, 2022): 1–9. http://dx.doi.org/10.1155/2022/9144673.

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The engineering rock mass is generally composed of the rock matrix and structural plane and is an anisotropic inhomogeneous geological body. Accidents such as roof collapse and well caving caused by joint and fissure expansion occur frequently during tunnel excavation and service, resulting in serious casualties and economic losses. It is of great theoretical significance and engineering value to study the fracture mechanism of the jointed rock mass to ensure the stability of the surrounding rock and the safe and efficient utilization of the urban underground space. To investigate the effects

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Petitpas, Eric, and B. Campion. "Crack Propagation in a Gun Barrel Due to the Firing Thermo-Mechanical Stresses." Journal of Pressure Vessel Technology 125, no. 3 (2003): 293–98. http://dx.doi.org/10.1115/1.1592813.

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The thermo-mechanical effects of firing induce very considerable stresses on the internal surface of the gun barrels. Consequently, micro-cracks appear very soon in the life of the tube. So it is important to control the propagation of these cracks. For more than 10 years, modeling has been used by Giat-Industries to understand and to control this phenomenon. This paper focuses on the study of short crack propagation kinetics during firings. Two-dimensional modeling taking into consideration the residual stresses from a hydraulic autofrettage and the thermo-mechanical stresses due to the succe

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Zhang, Fan, Zhenqi Hu, Kun Yang, Yaokun Fu, Zewei Feng, and Mingbo Bai. "The Surface Crack Extraction Method Based on Machine Learning of Image and Quantitative Feature Information Acquisition Method." Remote Sensing 13, no. 8 (2021): 1534. http://dx.doi.org/10.3390/rs13081534.

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In order to effectively control the damage caused by surface cracks to a geological environment, we need to find a convenient, efficient, and accurate method to obtain crack information. The existing crack extraction methods based on unmanned air vehicle (UAV) images inevitably have some erroneous pixels because of the complexity of background information. At the same time, there are few researches on crack feature information. In view of this, this article proposes a surface crack extraction method based on machine learning of UAV images, the data preprocessing steps, and the content and calc

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Wang, Rong Lu, Hao Huang, Tie Sheng Dou, and Meng Li. "Study on the Analysis of Crack Causes and Control Measures of Prestressed Concrete Cylinder Pipe." Advanced Materials Research 217-218 (March 2011): 1763–68. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1763.

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Being aimed at prestressed concrete cylinder pipe itself characteristic of structure and production process, PCCP cracks were classified, the classification and kinds of the crack causes are analyzed, the control measures and repair methods of different cracks is also discussed.

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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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Abakarov, Abdulla M., and Yulia G. Pronina. "On the effective elastic properties of a material with mutually perpendicular systems of parallel cracks." Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes 18, no. 1 (2022): 111–19. http://dx.doi.org/10.21638/11701/spbu10.2022.109.

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The effective properties of cracked solids are often expressed in terms of the crack density parameter or its tensor generalization, using the approximation of noninteracting cracks. This approximation remains accurate at sufficiently high crack densities, provided the location of cracks are random. The presented analysis confirms that the effective elastic moduli of a material with ordered fracture structures strongly depend on the linear dimensions of cracks and their mutual arrangement even at a constant crack density. A change in these parameters can cause a noticeable anisotropy of the ef

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Kim, Sang-Hyo, Syed Haider Ali Shah, Sang-Kyun Woo, Inyeop Chu, and Chungwook Sim. "Probability-Based Crack Width Estimation Model for Flexural Members of Underground RC Box Culverts." Applied Sciences 12, no. 4 (2022): 2063. http://dx.doi.org/10.3390/app12042063.

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Crack control for slabs and beams in current design practices in Korea are based on the Frosch’s model, which is adapted in ACI 318. It is more difficult to have consistent quality control in underground construction sites, such as the RC box culverts used for electric power distribution built below the ground level. There are more discrepancies between the as-built dimensions and the design dimensions provided in drawings in these structures. Due to this variability in construction error, the crack widths measured in such structures have higher potential to have more differences than the calc

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Li, Bingqi, Zhenhong Wang, Yunhui Jiang, and Zhenyang Zhu. "Temperature control and crack prevention during construction in steep slope dams and stilling basins in high-altitude areas." Advances in Mechanical Engineering 10, no. 1 (2018): 168781401775248. http://dx.doi.org/10.1177/1687814017752480.

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Temperature cracks commonly occur during mass concrete construction. Research shows that changes in temperature and peripheral constraints mainly cause crack formation in concrete. Engineers who lack experience often build structures prone to concrete cracks. Dams built in the high-altitude areas of Tibet are examples of such structure. Climatic conditions, such as large temperature variation and strong solar radiation, disrupt temperature control and crack prevention in concrete. In this study, we explored the measures for temperature control and crack prevention that are suitable for concret

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Kim, Jae Won, Seong Hwan Park, Yeon Gil Jung, and Hee Soo Lee. "Evaluation and Control of Crack Propagation in Dense Porcelain/ Porous Alumina Layered Structures for Dental Material Applications." Key Engineering Materials 317-318 (August 2006): 457–60. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.457.

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Layered structures of dense porcelain/porous alumina and dense porcelain/porcelainalumina/ porous alumina are designed and their crack propagation behaviors are investigated. As a substrate, the porous alumina, which is prepared by a gel-casting process using the binary slip of alumina powder and PMMA spherical micro-bead, is dried at room temperature for 24 h and then sintered at 1600 for 2 h. Porcelain is coated on the porous alumina substrate and then re-sintered at 987. Bi- and tri-layered structures are produced by the different dwell times (2 min, 10 min) at re-sintering temperature. The

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Bennett, D. A., X. Feng, and S. A. Velinsky. "Robotic Machine for Highway Crack Sealing." Transportation Research Record: Journal of the Transportation Research Board 1827, no. 1 (2003): 18–26. http://dx.doi.org/10.3141/1827-03.

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An operator-controlled crack-sealing machine was developed and tested at the Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center at the University of California, Davis. The machine, integrated onto a single truck, provides ease of operation and a simple, automated method of sealing random pavement cracks. The operator provides the machine its tasks and is the decision maker; the machine automatically performs the repetitive and dangerous tasks of mapping pavement cracks, creating seal paths for the robot, and sealing the cracks. The operator communicates with the m

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Yang, Hao, and Xiangyang Xu. "Intelligent crack extraction based on terrestrial laser scanning measurement." Measurement and Control 53, no. 3-4 (2020): 416–26. http://dx.doi.org/10.1177/0020294019877490.

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The hazards of cracks, which could badly decrease reliability and safety of structures, are receiving increasing attention with the popularity of tunnel constructions. Traditional crack inspection relies on visual examination, which is time-, cost- and labor-intensive. Therefore, how to identify and measure cracks intelligently is significantly essential. The paper focuses on the Canny method to extract cracks of tunnel structures by the intensity value of reflectivity. We propose and investigate a novel method which combines dilation and the Canny algorithm to identify and extract the cracks

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Zhang, Zhong, Xin Bin Zhang, Xiao Dun Wang, Tao Zhang, and Xiao Xu Zhang. "Merge Concreting and Crack Control Analysis of Mass-Concrete Base Slab of Nuclear Power Plant." Applied Mechanics and Materials 94-96 (September 2011): 2107–10. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.2107.

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It’s extremely strict on crack of nuclear power plant containment for the durability and barrier to nuclear leakage. High concrete strength and large heat of hydration make it difficult to control construction cracks. At the foreign and domestic nuclear power plants delamination or subregion had been adopted normally for mass concrete construction, but still more cracks appeared, and had paid great costs to deal with them. Based on theoretical analysis, in the article the study on merge concreting and crack control technical of base slab of the current popular CPR1000 nuclear power plant conta

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