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  • Open AccessOpen Access

    EDITORIAL

    Preface: Nano/Micro Structures in Application of Computational Mechanics

    Chang-Chun Lee1,*, Nien-Ti Tsou2, Taek-Soo Kim3
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 235-237, 2019, DOI:10.32604/cmes.2019.07807
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract This article has no abstract. More >

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    2547

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    1571

  • Open AccessOpen Access

    REVIEW

    Overview of Computational Modeling in Nano/Micro Scaled Thin Films Mechanical Properties and Its Applications

    Chang-Chun Lee1,*, Pei-Chen Huang1
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 239-260, 2019, DOI:10.32604/cmes.2019.06859
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract This research reviews the application of computational mechanics on the properties of nano/micro scaled thin films, in which the application of different computational methods is included. The concept and fundamental theories of concerned applications, material behavior estimations, interfacial delamination behavior, strain engineering, and multilevel modeling are thoroughly discussed. Moreover, an example of an interfacial adhesion estimation is presented to systematically estimate the related mechanical reliability issue in the microelectronic industry. The presented results show that the peeled mode fracture is the dominant delamination behavior of layered material system, with high stiffness along the bonding interface. More >

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    2864

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    1983

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    1

  • Open AccessOpen 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
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    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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    2625

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    1687

  • Open AccessOpen Access

    ARTICLE

    Eigenvalue Analysis of Thin Plate with Complicated Shapes By a Novel Infinite Element Method

    Deshin Liu1, Yuwei Chen1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 273-292, 2019, DOI:10.32604/cmes.2019.06364
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract A novel infinite element method (IEM) is presented for solving plate vibration problems in this paper. In the proposed IEM, the substructure domain is partitioned into multiple layers of geometrically similar finite elements which use only the data of the boundary nodes. A convergence criterion based on the trace of the mass matrix is used to determine the number of layers in the IE model partitioning process. Furthermore, in implementing the Craig-Bampton (CB) reduction method, the inversion of the global stiffness matrix is calculated using only the stiffness matrix of the first element layer. The… More >

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    2518

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    1661

  • Open AccessOpen Access

    ARTICLE

    Thickness Effect of Nanocrystalline Layer on the Deformation Mechanism of Amorphous/Crystalline Multilayered Structure

    Wen-Jay Lee1,*, Yu-Chien Lo2, Anchen Yang3, Kuanpeng Chen3, Nan-Yow Chen3
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 293-304, 2019, DOI:10.32604/cmes.2019.06620
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract Different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength and ductility of the composite materials. In this work, molecular dynamics simulations were conducted to study the thickness effect of nanocrystalline layer on mechanical properties and deformation behavior of the Cu64Zr36/Cu multi-layer structure. The stress-strain relationship, local stress, local strain, and deformation mechanism are investigated. The results reveal that the change of thickness of the crystalline layer significantly affects the mechanical properties and deformation behavior. As the strain at the elastic region, the amorphous Cu64Zr36 layer dominates the mechanical behavior, leading the fact More >

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    2734

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    1769

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    6

  • Open AccessOpen Access

    ARTICLE

    Effects of Deformation Rate on the Unbinding Pathway of the MMP8-Aggrecan_IGD Complex in Cartilage

    Deng Li1, Shuwei Chang1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 305-318, 2019, DOI:10.32604/cmes.2019.06475
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract Mechanical force plays a critical role in the remodeling and degradation of cartilage tissues. The cartilage tissue generates, absorbs, and transmits mechanical force, enabling specific biological processes in our body. A moderate intensity mechanical force is necessary for cartilage tissue remodeling and the adaptation of biomechanical properties, but a high intensity mechanical force can lead to pathological degradation of cartilage tissue. However, the molecular mechanism of cartilage degradation is still unclear. We use full atomistic simulations with SMD simulations to investigate whether the magnitude of mechanical force affects the unbinding pathway of the MMP8-Aggrecan_IGD complex. More >

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    2626

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    1694

  • Open AccessOpen Access

    ARTICLE

    The Analysis of Thermal-Induced Phase Transformation and Microstructural Evolution in Ni-Ti Based Shape Memory Alloys By Molecular Dynamics

    Hsin-Yu Chen1, Nien-Ti Tsou1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 319-332, 2019, DOI:10.32604/cmes.2019.06447
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract Shape memory alloys has been widely applied on actuators and medical devices. The transformation temperature and microstructural evolution play two crucial factors and dominate the behavior of shape memory alloys. In order to understand the influence of the composition of the Ni-Ti alloys on the two factors, molecular dynamics was adopted to simulate the temperature-induced phase transformation. The results were post-processed by the martensite variant identification method. The method allows to reveal the detailed microstructural evolution of variants/phases in each case of the composition of Ni-Ti. Many features were found and having good agreement with More >

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    3028

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    1885

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    6

  • Open AccessOpen Access

    ARTICLE

    Computational Modeling of Dual-Phase Ceramics with Finsler-Geometric Phase Field Mechanics

    John D. Clayton1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 333-350, 2019, DOI:10.32604/cmes.2019.06342
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract A theory invoking concepts from differential geometry of generalized Finsler space in conjunction with diffuse interface modeling is described and implemented in finite element (FE) simulations of dual-phase polycrystalline ceramic microstructures. Order parameters accounting for fracture and other structural transformations, notably partial dislocation slip, twinning, or phase changes, are dimensionless entries of an internal state vector of generalized pseudo-Finsler space. Ceramics investigated in computations are a boron carbide-titanium diboride (B4C-TiB2) composite and a diamond-silicon carbide (C-SiC) composite. Deformation mechanisms-in addition to elasticity and cleavage fracture in grains of any phase-include restricted dislocation glide (TiB2 phase), deformation… More >

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    2682

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    1870

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    2

  • Open AccessOpen Access

    ARTICLE

    Detection of Graphene Cracks By Electromagnetic Induction, Insensitive to Doping Level

    Taeshik Yoon1,†, Sumin Kang1,†, Tae Yeob Kang1, Taek-Soo Kim1,2,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 351-361, 2019, DOI:10.32604/cmes.2019.06672
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract Detection of cracks is a great concern in production and operation processes of graphene based devices to ensure uniform quality. Here, we show a detection method for graphene cracks by electromagnetic induction. The time varying magnetic field leads to induced voltage signals on graphene, and the signals are detected by a voltmeter. The measured level of induced voltage is correlated with the number of cracks in graphene positively. The correlation is attributed to the increasing inductive characteristic of defective graphene, and it is verified by electromagnetic simulation and radio frequency analysis. Furthermore, we demonstrate that More >

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    2914

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    1766

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    1

  • Open AccessOpen Access

    ARTICLE

    A Layer-Based Mesh Generator and Scheme for 3D Printing Simulation

    Ming-Hsiao Lee1,*, Shou-I Chen2, Wen-Hwa Chen3, Ying Mao3
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 363-374, 2019, DOI:10.32604/cmes.2019.06476
    （This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)
    Abstract 3D Printing, also called Additive Manufacturing, has become a promising manufacturing method to produce parts in various fields as it can produce parts even with very irregular shapes in a relatively shorter process and time. However, during the printing process, some problems could decrease the accuracy and quality of the printed parts, such as warpage due to thermal strains, deformation due to inadequate supports, etc. The finite element method is most commonly adopted to evaluate engineering problems in advance to reduce possible failures; however, the element meshes, needed for analyses, are always irregularly distributed, especially… More >

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    3217

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    1796

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  • Open AccessOpen Access

    ARTICLE

    Simulation of Damage Evolution and Study of Multi-Fatigue Source Fracture of Steel Wire in Bridge Cables under the Action of Pre-Corrosion and Fatigue

    Ying Wang1,*, Yuqian Zheng1
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 375-419, 2019, DOI:10.32604/cmes.2019.06905
    Abstract A numerical simulation method for the damage evolution of high-strength steel wire in a bridge cable under the action of pre-corrosion and fatigue is presented in this paper. Based on pitting accelerated crack nucleation theory in combination with continuum mechanics, cellular automata technology (CA) and finite element (FE) analysis, the damage evolution process of steel wire under pre-corrosion and fatigue is simulated. This method automatically generates a high-strength steel wire model with initial random pitting defects, and on the basis of this model, the fatigue damage evolution process is simulated; thus, the fatigue life and… More >

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    3040

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    1800

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  • Open AccessOpen Access

    ARTICLE

    Modeling and Simulation of Dynamic Unloading of Prestressed Rockmass

    Liang Wu1, Xiaorui Xiang1, Yang Chen1, Karrech Ali2,*, Junru Zhou1,*, Ming Chen3
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 421-443, 2019, DOI:10.32604/cmes.2019.05218
    Abstract During the excavation of deep rock, a sudden change in boundary conditions will cause the in-situ stress on the excavation surface to release instantaneously. This disturbance propagates in the form of an unloading stress wave, which will enlarge the damage field of surrounding rock. In this paper, the dynamic unloading problem of the in-situ stress in deep rock excavation is studied using theoretical, numerical, and experimental methods. First, the dynamic unloading process of rock is analyzed through adopting the wave equation, and the equivalent viscous damping coefficient of the material is taken into consideration. Calculations More >

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    2373

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    1380

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  • Open AccessOpen Access

    ARTICLE

    Numerical Treatment for Stochastic Computer Virus Model

    Ali Raza1, Muhammad Shoaib Arif1,*, Muhammad Rafiq2, Mairaj Bibi3, Muhammad Naveed1, Muhammad Usman Iqbal4, Zubair Butt4, Hafiza Anum Naseem4, Javeria Nawaz Abbasi3
    CMES-Computer Modeling in Engineering & Sciences, Vol.120, No.2, pp. 445-465, 2019, DOI:10.32604/cmes.2019.06454
    Abstract This writing is an attempt to explain a reliable numerical treatment for stochastic computer virus model. We are comparing the solutions of stochastic and deterministic computer virus models. This paper reveals that a stochastic computer virus paradigm is pragmatic in contrast to the deterministic computer virus model. Outcomes of threshold number C∗ hold in stochastic computer virus model. If C∗ < 1 then in such a condition virus controlled in the computer population while C∗ > 1 shows virus persists in the computer population. Unfortunately, stochastic numerical methods fail to cope with large step sizes of time. More >

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