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  • Open Access

    ARTICLE

    Intelligent Detection Model Based on a Fully Convolutional Neural Network for Pavement Cracks

    Duo Ma1, 2, 3, Hongyuan Fang1, 2, 3, *, Binghan Xue1, 2, 3, Fuming Wang1, 2, 3, Mohammed A. Msekh4, Chiu Ling Chan5

    CMES-Computer Modeling in Engineering & Sciences, Vol.123, No.3, pp. 1267-1291, 2020, DOI:10.32604/cmes.2020.09122 - 28 May 2020

    Abstract The crack is a common pavement failure problem. A lack of periodic maintenance will result in extending the cracks and damage the pavement, which will affect the normal use of the road. Therefore, it is significant to establish an efficient intelligent identification model for pavement cracks. The neural network is a method of simulating animal nervous systems using gradient descent to predict results by learning a weight matrix. It has been widely used in geotechnical engineering, computer vision, medicine, and other fields. However, there are three major problems in the application of neural networks to… More >

  • Open Access

    ARTICLE

    Dimensionless Variation of Seepage in Porous Media with Cracks Stimulated by Low-Frequency Vibration

    Liming Zheng1, 3, *, Xiaodong Han2, 4, Xinjun Yang1, Qingzhong Chu1, Guanghui Li1

    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 1055-1080, 2020, DOI:10.32604/cmes.2020.07588 - 01 March 2020

    Abstract Pulse excitation or vibration stimulation was imposed on the low permeable formation with cracks to enhance the production or injection capacity. During that process, a coupling of wave-induced flow and initial flow in dual-porous media was involved. Researchers had done much work on the rule of wave propagation in fractured porous media, whereas attentions on the variation law of flow in developing low permeable formation with cracks under vibration stimulation were not paid. In this study, the effect of low-frequency vibration on the seepage in dual-porous media was examined for the application of wave stimulation… More >

  • Open Access

    ARTICLE

    On the Onset of Cracks in Arteries1

    P. Mythravaruni, K.Y. Volokh*

    Molecular & Cellular Biomechanics, Vol.17, No.1, pp. 1-17, 2020, DOI:10.32604/mcb.2019.07606

    Abstract We present a theoretical approach to study the onset of failure localization into cracks in arterial wall. The arterial wall is a soft composite comprising hydrated ground matrix of proteoglycans reinforced by spatially dispersed elastin and collagen fibers. As any material, the arterial tissue cannot accumulate and dissipate strain energy beyond a critical value. This critical value is enforced in the constitutive theory via energy limiters. The limiters automatically bound reachable stresses and allow examining the mathematical condition of strong ellipticity. Loss of the strong ellipticity physically means inability of material to propagate superimposed waves.… More >

  • Open Access

    ARTICLE

    Fatigue Investigations on Steel Pipeline Containing 3D Coplanar and Non-Coplanar Cracks

    Zhongmin Xiao1, Wengang Zhang2, Yanmei Zhang1, *, Mu Fan3

    CMC-Computers, Materials & Continua, Vol.62, No.1, pp. 267-280, 2020, DOI:10.32604/cmc.2020.06567

    Abstract Fluctuated loadings from currents, waves and sea ground motions are observed on offshore steel pipelines, and they will result in small cracks to propagate continuously and cause unexpected damage to offshore/geotechnical infrastructures. In spite of the availability of efficient techniques and high-power computers for solving crack problems, investigations on the fatigue life of offshore pipelines with 3D interacting cracks are still rarely found in open literature. In the current study, systematic numerical investigations are performed on fatigue crack growth behaviours of offshore pipelines containing coplanar and non-coplanar cracks. Extended finite element method (XFEM) is adopted More >

  • Open Access

    ARTICLE

    Study on On-site Monitoring of Hydration Heat of Mass Concrete for Bridge Slab Based on Measured Data

    Gao Xiaolong1, Li Chunguang2, Qiao Yunhong3

    Intelligent Automation & Soft Computing, Vol.25, No.4, pp. 775-783, 2019, DOI:10.31209/2019.100000081

    Abstract Plagued by consistent temperature cracks caused by hydration heat of mass concrete construction, a lot of research on concrete DAMS and other large hydraulic concrete, the theory also more deeply, and for large span bridge foundation pile caps, corresponding much smaller size of mass concrete, the related research is less. This article obtains from the cooling water pipes "embedded" scheme optimization, based on the new Tianjin Haihe river bridge project as the engineering background, construction of the concrete hydration heat temperature rise theory model was set up, with the help of theory formula, the numerical More >

  • Open Access

    ARTICLE

    Dynamic Fracture Analysis of Functionally Gradient Materials with Two Cracks By Peridynamic Modeling

    Zhanqi Cheng1, Dongdong Jin1, Chengfang Yuan1, Le Li1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 445-464, 2019, DOI:10.32604/cmes.2019.06374

    Abstract In the research, the dynamic fracture failure problem of functionally graded materials (FGMs) containing two pre-cracks was analyzed using a bond-based Peridynamic (PD) method numerical model. The two convergence of decreasing the area of PD horizon (δ-convergence) and uniform mesh refinement (m-convergence) were studied. The effects of both crack position and distance between two cracks on crack propagation pattern in FGMs plate under tensile loads are studied. Furthermore, the effects of different gradient patterns on the dynamic propagation of cracks in FGMs are also investigated. The simulate results suggest that the cracks positions and the More >

  • Open Access

    ABSTRACT

    On the Onset of Cracks in Arteries

    Pullela Mythravaruni1, Konstantin Volokh1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 87-87, 2019, DOI:10.32604/mcb.2019.07274

    Abstract We present a theoretical approach to study the onset of failure localization into cracks in arterial wall. The arterial wall is a soft composite comprising hydrated ground matrix of proteoglycans reinforced by spatially dispersed elastin and collagen fibers. As any material, the arterial tissue cannot accumulate and dissipate strain energy beyond a critical value. This critical value is enforced in the constitutive theory via energy limiters. The limiters automatically bound reachable stresses and allow examining the mathematical condition of strong ellipticity. Loss of the strong ellipticity physically means inability of material to propagate superimposed waves.… More >

  • Open Access

    ABSTRACT

    DNA Cracks at the Region of Protein Binding Under the Action of Stretch

    Qingjia Chi*, Xinge Geng

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 118-118, 2019, DOI:10.32604/icces.2019.05168

    Abstract The binding of DNA to protein in the cellular nucleus is a common phenomenon. DNA molecules will soften at the binding region when they adhere to proteins. Softening will affect the mechanical properties significantly. However, the mechanism underlying the mechanical softening remains to be explored. To understand the changes in the mechanical properties of DNA, the peridynamics technique can effectively capture the stress of the softened DNA under tensile forces. And later the results were verified by finite element computations. Utilizing the computations of perydynamics to reveal the stretch of the double-stranded DNA. The results… More >

  • Open Access

    ABSTRACT

    Cohesive Zones and Interactions of Mixed-Mode Interface and Matrix Cracks

    J. Scheel, A. Ricoeur

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 9-9, 2019, DOI:10.32604/icces.2019.05030

    Abstract The heterogeneous state of stress in composite materials and the possible damage in interfaces, lead to a complicated problem concerning matrix crack tip loading analysis and crack path prediction. A powerful and accurate tool for calculating crack tip loadings is the J-integral, which was independently introduced by Rice and Cherepanov. The calculation of crack deflection angles using the J-integral criterion is enabled by the J-integral vector formulation, whereupon the calculation of matrix crack tip loadings and also interface crack tip loadings is possible. The J-integral and the crack tip opening displacement, as crack tip loading… More >

  • Open Access

    ARTICLE

    Energy Release Rates for Interface Cracks in Multilayered Structures

    Changwei Huang1,*, Philip A. Williams2

    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 261-272, 2019, DOI:10.32604/cmes.2019.06681

    Abstract This paper examines the evolution of the interfacial deflection energy release rates in multilayered structures under four-point bending. The J-integral and the extended finite element method (XFEM) are adopted to investigate the evolution of the interfacial deflection energy release rates of composite structures. Numerical results not only verify the accuracy of analytical solutions for the steady-state interfacial deflection energy release rate, but also provide the evolutionary history of the interfacial deflection energy release rate under different crack lengths. In addition, non-dimensional parametric analyses are performed to discuss the effects of normalized ratios of the crack length, More >

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