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  • Open Access


    Finite Element Method Simulation of Wellbore Stability under Different Operating and Geomechanical Conditions

    Junyan Liu1, Ju Liu1, Yan Wang1, Shuang Liu1, Qiao Wang1, Yihe Du2,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.1, pp. 205-218, 2024, DOI:10.32604/fdmp.2023.030645

    Abstract The variation of the principal stress of formations with the working and geo-mechanical conditions can trigger wellbore instabilities and adversely affect the well completion. A finite element model, based on the theory of poro-elasticity and the Mohr-Coulomb rock damage criterion, is used here to analyze such a risk. The changes in wellbore stability before and after reservoir acidification are simulated for different pressure differences. The results indicate that the risk of wellbore instability grows with an increase in the production-pressure difference regardless of whether acidification is completed or not; the same is true for the instability area. After acidizing, the… More >

  • Open Access


    Influence of Bayer Red Mud on the Operational and Mechanical Characteristics of Composite Cement Mortar

    Cheng Hu1,2, Weiheng Xiang1,3,*, Ping Chen2,3, Yi Yang4,5, Libo Zhou3, Jiufang Jiang5, Shunkai Li2,4, Yang Ming1, Qing Li3

    Journal of Renewable Materials, Vol.11, No.11, pp. 3945-3956, 2023, DOI:10.32604/jrm.2023.027544

    Abstract The aim of this study is to enhance the value and utilization of red mud generated in the Bayer process by preparing composite cement mortars. The effects of two different types of Bayer red mud with varying physical and chemical characteristics on the fluidity, mechanical strength, mineral composition, and microstructure of the composite cement mortar were systematically evaluated. The results showed that the optimal addition of red mud A was 10 wt%, while it was 20 wt% for red mud B. The mechanical properties of the composite cement mortar met the standards for P·O42.5 cement. Furthermore, the composite mortar with… More >

  • Open Access


    The Mechanical Property of 2D Materials and Potential Application in Gas Separation

    Dong Li1,*, Yonggang Zheng1, Hongwu Zhang1, Hongfei Ye1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09714

    Abstract The family of 2D transition-metal oxides and dichalcogenides with 1H phase (1H-MX2) has sparked great interest from the perspective of basic physics and applied science. Interestingly, their performances could be further regulated and improved through strain engineering. Effective regulation is founded on a wellunderstood mechanical performance, however, the large number of 1H-MX2 materials has not yet been revealed. Here, a general theoretical model is constructed based on the molecular mechanics, which provides an effective and rapid analytical algorithm for evaluating the mechanical properties of the entire family of 1H-MX2. The validity of the constructed model is verified by molecular dynamics… More >

  • Open Access


    A Data-Fusion Method for Uncertainty Quantification of Mechanical Property of Bi-Modulus Materials: An Example of Graphite

    Liang Zhang1,*, Zigang He1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09713

    Abstract The different elastic properties of tension and compression are obvious in many engineering materials, especially new materials. Materials with this characteristic, such as graphite, ceramics, and composite materials, are called bi-modulus materials. Their mechanical properties such as Young’s modulus have randomness in tension and compression due to different porosity, microstructure, etc. To calibrate the mechanical properties of bi-modulus materials by bridging FEM simulation results and scarce experimental data, the paper presents a data-fusion computational method. The FEM simulation is implemented based on Parametric Variational Principle (PVP), while the experimental result is obtained by Digital Image Correlation (DIC) technology. To deal… More >

  • Open Access


    Development of Small Punch Test to Research the Mechanical Properties of Nuclear Fuel Cladding Tubes

    Huansheng Lai1,*, Xiaowei Jiang1, Yuntao Zhong2, Peinan Du2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09652

    Abstract Nuclear fuel cladding tubes have a outer diameter about 10 mm with a wall thickness about 0.5 mm. Their mechanical properties hence cannot be researched using standard test methods. In this study, small punch test (SPT) was developed to research the mechanical properties of nuclear fuel cladding tubes. Instead of plate SPT specimen, tube specimen was used to research fracture toughness and creep properties. Fninite elment simulation based on GTN model was used to verify the proposed method. Results indicated that the tube specimen with a noth can be sufficiently to research fracture toughness. The small punch creep test (SPCT)… More >

  • Open Access


    Zonal Finite Line Method and Its Applications in Thermal-Mechanical Analysis of Composite Structures

    Xiaowei Gao1,*, Huayu Liu1, Weilong Fan1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.1, pp. 1-1, 2023, DOI:10.32604/icces.2023.09510

    Abstract In this paper, a novel numerical method, Zonal Free Element Method (ZFLM), is proposed and used to solve thermal-mechanical problems composed of multiple and functionally graded materials. ZFLM is a collocation method, in which two or three lines in 2D or 3D problems, called as line-set, are used at each node to establish the solution scheme solving engineering problems governed by partial differential equations. In ZFLM, the Lagrange polynomial is adopted to approximate physical variables varying over each line of the line-set. The first-order partial derivative is derived by using a directional derivative technique along arclength of a line, and… More >

  • Open Access


    Uniaxial Compressive Mechanical Properties of Three-Dimensional Graphene: Theoretical Models and Molecular Dynamics Simulations

    Xinliang Li1, Jiangang Guo1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.1, pp. 1-2, 2023, DOI:10.32604/icces.2023.09484

    Abstract As the first two-dimensional (2D) material discovered in experiments, graphene has attracted increasing attention from the scientific community [1]. And it possesses many superb mechanical, electronic and optical properties [2-4] due to its unique atomic structure. Its Young’s modulus and failure strength are 1TPa and 130GPa [5], respectively. Thus, 2D graphene has been extensively used in nanosensors and nanocomposites [6-8], etc. In order to fabricate graphene-based devices which inherit outstanding properties of 2D graphene, materials scientists are trying to use 2D graphene as building blocks to construct three-dimensional (3D) carbon nanomaterials, such as 3D graphene networks [9-11]. Nowadays, these 3D… More >

  • Open Access


    A Thermo-Chemo-Mechanically Coupled Peridynamic Model for Investigating the Crack Behaviors of Deformable Solids with Heat Conduction, Species Diffusion, and Chemical Reactions

    Yu Xiang1, Bao Qin2, Zheng Zhong1,*, Zhenjun Jiao1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.26, No.4, pp. 1-1, 2023, DOI:10.32604/icces.2023.09088

    Abstract A thermo-chemo-mechanically (TCM) coupled peridynamic (PD) model is proposed to analyze the crack behavior in solids considering heat conduction, species diffusion, and chemical reactions. A PD theoretical framework is established based on non-equilibrium thermodynamics. The influences of species diffusion and chemical reactions on the Helmholtz free energy density and the subsequent formation and propagation of cracks are distinguished by introducing the concentration of diffusive species and the extent of the chemical reaction. Furthermore, inter-physics coupling coefficients are calibrated by equating the corresponding field in the PD model to the continuum mechanics under the same condition. The cases of vacancy redistribution… More >

  • Open Access


    3D Analysis of Effect of Graphite Morphology on Thermomechanical Behaviour of CGI

    Minghua Cao1,*, Konstantinos P. Baxevanakis1, Vadim V. Silberschmidt1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.26, No.3, pp. 1-1, 2023, DOI:10.32604/icces.2023.09086

    Abstract Compacted graphite iron (CGI) was attractive as an important material for the industry since its introduction in the last century. Thanks to its high strength, great wear resistance and thermal conductivity, CGI became extensively applied in the automotive industry as engine parts: brake drums, cylinder heads and exhaust manifolds. As a metal-matrix composite, CGI contains two microstructural phases: graphite inclusions and a metallic matrix. The main fracture mechanism of CGI under high-temperature service conditions at macroscale is linked to graphite-matrix (interfacial) debonding, formation of microcracks and their networks, and final failure of the material at microscale because of the mismatch… More >

  • Open Access


    A Coupled Hygro-Thermo-Mechanical Bond-Based Cosserat Peridynamic Porous Media Model for Heated Fracture of Concrete

    Jiaming Zhang1, Xihua Chu1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.26, No.3, pp. 1-2, 2023, DOI:10.32604/icces.2023.09055

    Abstract This paper presents a fully coupled hygro-thermo-mechanical bond-based Cosserat peridynamic porous media model for concrete at high temperature [1-3]. The model enables the problem of Poisson's ratio limitation to be relieved and the effect of cement particle size and its independent micro-rotation to be taken into account [4]. A multi-rate explicit integration strategy is proposed, which allows this complex multi-field fully coupled governing equation to be well solved. Numerical simulations mainly focus on the terms of temperature, water vapour pressure and damage level to verify the validity of the model [5-9]. And they additionally demonstrate the effect of cement particle… More >

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