Home / Journals / ICCES / Vol.21, No.4, 2019
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  • Open Access

    ABSTRACT

    Performance-Based Damage Assessment of Steel/RC Hybrid Structure

    Wei Huang1,*, Zhi Zhou2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 68-68, 2019, DOI:10.32604/icces.2019.05066
    Abstract Structural members of different materials in hybrid structures have different damage performances. Based on the classical Park-Ang damage model, a consistent modification of that model is proposed for structural members of different materials in order to determine the behavior and the damage process from member-level to structure-level. Furthermore, the specific limit values of this damage model at various performance levels are calculated. Obvious differences have been found between the limit values of different types of members. In order to unify the damage limits that correspond to predefined performance levels such that a comparison between different members can be made directly,… More >

  • Open Access

    ABSTRACT

    Computational Solutions of Fractional Phase Change Problems

    Vaughan R. Voller
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 69-69, 2019, DOI:10.32604/icces.2019.05082
    Abstract There has been current interest in studying diffusion processes that involve memory and non-locality. These phenomena can be modeled using fractional calculus tools. A fractional derivative in time, a convolution of previous states of the system, modeling memory and a fractional derivative in space, a convolution over aspace domain, modeling non-locality. In this work we consider how such treatments can be incorporated into models of phase change systems. In particular, we examine the consequences of replacing the time and space derivative in the classic one-phase Stefan melting problem with appropriate fractional derivatives. A number of alternative formations and associated computational… More >

  • Open Access

    ABSTRACT

    Numerical Modeling of Solid Movement in Phase Change Processes

    Igor Vušanović1,*, Vaughan R Voller2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 70-70, 2019, DOI:10.32604/icces.2019.05185
    Abstract In the modeling of liquid to solid phase change processes the movement of the solid phase (e.g., the grains that form when solidifying an alloy) can have a significant impact on the timing and pattern of the process. While a number of solidification models account for the movement of the solid phase, additional analysis is needed to fully understand the phenomena and guide in the selection of appropriate numerical technologies for its resolution. Towards this end, here, we introduce a reduced complexity model (RCM) to describe the solidification of an initially liquid binary material flowing between two parallel cooled plates… More >

  • Open Access

    ABSTRACT

    Data-Driven Approach to Fluid Engineering

    Shigeru Obayashi*, Aiko Yakeno
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 71-71, 2019, DOI:10.32604/icces.2019.05229
    Abstract In our laboratory, we have been conducting research focusing on a data-driven approach to fluid engineering for design. Designing aerospace machines, these days requires more advanced factors. The recent development of supercomputer leads that we must treat more complex flow phenomena that brings uncertainty, with the more advanced design considered. Such as a reduced-order model and a data assimilation method, to estimate and reduce the uncertainty in numerical simulations, are potential ways to assist the advanced design. That is by use of experimental or observational data and numerical analysis of physical equations. Recently, we are focusing on observation sensitivity, in… More >

  • Open Access

    ABSTRACT

    Generalized Formula of the Fraction of Interphase for Polydisperse Non-Spherical Particles: Theoretical and Numerical Models

    Zhigang Zhu1,*, Wenxiang Xu1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 72-72, 2019, DOI:10.32604/icces.2019.04957
    Abstract The volume fraction of interphase is an important microstructure parameter in the prediction of macroscopic properties of particulate composites. Currently, some researchers have presented theoretical and numerical investigations on the interphase fraction for spherical particle systems, and even quantify the influence of interphase fraction on the overall elastic and transport properties of particulate composites. However, the overlapping interphase fraction in polydisperse non-spherical particle systems is still an open issue. In this study, a generic theoretical model is formulated to derive the overlapping interphase fraction for polydisperse 2D non-circular and 3D non-spherical particle systems by means of the statistical geometry of… More >

  • Open Access

    ABSTRACT

    Kalman Filter Dynamic Mode Decomposition for Data Assimilation

    Taku Nonomura
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 73-74, 2019, DOI:10.32604/icces.2019.05266
    Abstract In this presentation, a family of Kalman filter dynamic mode decomposition, which consists of algorithms of the linear Kalman filter DMD method which identify the linear system and the extended Kalman filter DMD method which simultaneously identify the system and estimates state variable, is introduced. Then, the application of the extended Kalman filter DMD to data assimilation is discussed. More >

  • Open Access

    ABSTRACT

    Computational Grains for Nanocomposites with Interface Stress Effects

    Junbo Wang*, Leiting Dong
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 75-75, 2019, DOI:10.32604/icces.2019.04820
    Abstract In this study, two/three-dimensional computational grains are developed for micromechanical modeling of heterogeneous materials with nanoscale inhomogeneities, considering the interface stress effect. Two types of computational grains are developed, depending on the types of inhomogeneity in each element. Each computational grain can include alternatively a spherical void or a spherical elastic inclusion. In these computational grains, an inter-element compatible displacement field is assumed along the element outer-boundary, and interior displacement fields in the matrix as well as in the inclusion are independently assumed as T-Trefftz trial functions. For planar problems, complex potentials are used to derive the Trefftz trial displacement… More >

  • Open Access

    ABSTRACT

    A new Fragile Points Method (FPM) in Computational Mechanics, Based on the Concepts of Point Stiffnesses and Numerical Flux Corrections

    Tian Yang1, Leiting Dong1,*, Satya N. Atluri2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 76-76, 2019, DOI:10.32604/icces.2019.05078
    Abstract In this paper, a new method, named the Fragile Points Method (FPM), is developed for computer modeling in engineering and sciences. In the FPM, simple, local, polynomial, discontinuous and Point-based trial and test functions are proposed based on randomly scattered points in the problem domain. The local discontinuous polynomial trial and test functions are postulated by using the Generalized Finite Difference method. These functions are only piece-wise continuous over the global domain. By implementing the Point-based trial and test functions into the Galerkin weak form, we define the concept of Point Stiffnesses as the contribution of each Point in the… More >

  • Open Access

    ABSTRACT

    Characterizing the Ultra-Slow Creep in Concrete Based on the Non-Local Structural Derivative Maxwell Model

    Xianglong Su*, Wenxiang Xu, Wen Chen
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 77-77, 2019, DOI:10.32604/icces.2019.05090
    Abstract Creep of concrete can last for decades, which displays the ultra-slow rheological phenomena. As an empirical formula, the logarithmic law is usually used to describe the ultra-slow creep. However, the logarithmic law does not always work well especially for the long-term creep. And its corresponding relaxation response cannot be obtained analytically. It is known that the Mittag-Leffler and the inverse Mittag-Leffler functions are generalized from the exponential and the logarithmic functions, respectively. And the inverse Mittag-Leffler function is much slower and generalized than the logarithmic function. In this paper, we use the non-local structural derivative to establish a new Maxwell-type… More >

  • Open Access

    ABSTRACT

    Characterization Method of ITZ in Concrete and Measurement of Nominal Compressive Elastic Modulus Based on SEM and DIC

    Jintao He, Dong Lei*, Xuwei Cui, Pengxiang Bai, Feipeng Zhu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 78-78, 2019, DOI:10.32604/icces.2019.05228
    Abstract With the combination of scanning electron microscope (SEM) and digital image correlation (DIC), the mechanical properties of interfacial transition zone (ITZ) in concrete are experimentally studied. The experimental compression tests are performed on cuboid samples whose half part is aggregate and the other part is mortar. The morphology of the ITZ is captured by SEM under compressive load, and from the recorded images the deformation of the ITZ is analyzed. After that, the distribution of the nominal compressive elastic modulus of the ITZ is obtained along the distance from the aggregate to the mortar, which can be used to characterize… More >

  • Open Access

    ABSTRACT

    Microscopic Model Containing Micro-Voids for Analysis of Cement Mortar Damage Fracture Process

    Jichang Wang, Xiaoming Guo*, Xiaoxiao Sun
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 79-79, 2019, DOI:10.32604/icces.2019.05248
    Abstract Cement mortar is an important component of many composite materials and one of the most widely used materials in engineering construction. At microscopic level, cement mortar can be regarded as a multiphase material composed of fine aggregates, cement paste, and a great many of initial defects, the form of which are micro-cracks and micro-voids. The macroscopic properties of cement mortar will be influenced by mechanical properties of different constituents and complex internal structures. The microscopic model containing micro-voids is established by the method of secondary development. The process of cement mortar damage fracture is studied. The fracture toughness of fine… More >

  • Open Access

    ABSTRACT

    Investigation of Variable-order Fractional Wave Propagation in Granular Materials

    Wei Cai*, Hua Chen
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 80-80, 2019, DOI:10.32604/icces.2019.05672
    Abstract Recent decades have witnessed a fast growing research on the theory of wave propagation in granular materials because of its important applications of frequency dependent attenuation. Fractional calculus has been recognized as an efficient tool to model such kind of phenomena. This study firstly presented a survey of the frequency-dependent attenuated fractional wave models. To have a better understanding of the wave propagation in layered materials, the variable-order fractional wave equation is subsequently proposed on the basis of the corresponding viscoelastic constitutive equation. Numerical simulations compared with traditional models are presented by the implicit finite difference method to the efficiency… More >

  • Open Access

    ABSTRACT

    The Experimental Simulation Technology and System of Solid Fluidization Exploitation of Marine Non-Diagenetic Natural Gas Hydrate

    Lin Jiang1,*, Na Wei1,*, Jinzhou Zhao1, Shouwei Zhou1,2, Liehui Zhang1, Qingping Li3, Guorong Wang1, Jun Zhao1, Kaisong Wu1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 81-83, 2019, DOI:10.32604/icces.2019.04515
    Abstract With huge reserves, marine natural gas hydrate is one of the most potential unconventional alternative energy sources after shale gas, coalbed methane and tight gas. The research and pilot engineering of natural gas hydrate exploitation technology mainly adopts the depressurization method at home and abroad, all of which refer to the exploitation technology of conventional oil and gas.
    While using the depressurization method to exploit the non-diagenetic gas hydrate, the undersea hydrate decomposes in situ, partly flows to the bottom of the well, and escapes into the seawater in large quantities, and the hydrate will face the following six risks… More >

  • Open Access

    ABSTRACT

    Multiphase Non-Equilibrium Pipe Flow Behaviors in the Solid Fluidization Exploitation of Marine Natural Gas Hydrate Reservoir

    Na Wei1,*, Jinzhou Zhao1, Wantong Sun1, Shouwei Zhou1, Liehui Zhang1, Qingping Li2, Haitao Li1, Qiang Fu1,2, Xin Lv2, Lijun Zheng2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 84-86, 2019, DOI:10.32604/icces.2019.04533
    Abstract Currently, marine natural gas hydrate has attracted people’s attention due to its huge amount of resources. As a creative way to securely and efficiently exploit metastable hydrate reservoir which is in shallow subsurface of sea floor and with weak cementing, the method of solid fluidization exploitation is to excavate and crush the marine natural gas hydrate reservoir, transport the hydrate to the sea surface platform through the airtight pipeline, and finally the methane gas is obtained after post-processing.
    In the process that the hydrate solid particles are transported up, as the temperature rises and the pressure drops, the hydrate rises… More >

  • Open Access

    ABSTRACT

    An Inward and Outward Growing Shell Model in Water-in-Oil Mud

    Hongwei Yang1,*, Jun Li1, Gonghui Liu1,2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 87-87, 2019, DOI:10.32604/icces.2019.05080
    Abstract When gas kick occurs in deepwater drilling, solid hydrate particles are easily formed during the gas bubble rising in the wellbore under low temperature and high pressure conditions, which not only affects the flow characteristics of the mud, but also may lead to wellbore blockage and increase the difficulty and risk of well control treatment.
    In this paper, based on water-in-oil drilling fluid, a comprehensive model of hydrate shell growing on droplet surface is established, including an inward growth model and an outward growth model of hydrate shell. The main factors considered in this model are: (i) mass transfer rate… More >

  • Open Access

    ABSTRACT

    Theoretical Analysis and Numerical Simulation of Multi-Fields Coupled Variation During Deepwater Hydrate-Bearing Reservoir Exploitation

    Ye Chen, Yonghai Gao, Guizhen Xin, Wang Yao, Dongzhi Gao, Litao Chen, Baojiang Sun*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 88-89, 2019, DOI:10.32604/icces.2019.05522
    Abstract Natural gas hydrate is regarded as a kind of potential alternative energy resource and attracts the attention all over the world. Geological surveys have found that most natural gas hydrates are buried at the bottom of the sea. Several development methods, such as depressurization, thermal stimulation and inhibitor injection are proposed gradually on the basis of hydrate special properties, obtaining certain trial-produce performance. It is of great significance to learn the flow rules underground for production safety guarantee and efficiency improvement. However, the special phase transition of hydrate between solid and fluid accompanied by energy and mass change makes it… More >

  • Open Access

    ABSTRACT

    Simulations of Core Collapse Supernova Explosion on PEZY-SC Processors and GPUs

    Hideo Matsufuru1,*, Kohsuke Sumiyoshi2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 90-90, 2019, DOI:10.32604/icces.2019.05390
    Abstract The core collapse supernovae are one of key phenomena to understand the history of the Universe and the origin of heavy elements. To understand their explosion mechanism, large scale numerical simulations are essential that require to solve a multi-physics system described by coupled equations of hydrodynamics and neutrino-radiation transfer in multidimensions. Since the neutrino transfer is governed by the Boltzmann equation in six-dimensional space, necessary computational resource rapidly increases as the number of grids in simulations grows. So far numerical studies have been performed mostly on massively parallel computers and only a few studies have been made using accelerator architectures,… More >

  • Open Access

    ABSTRACT

    Interval Field Model and Interval Finite Element Analysis

    Bingyu Ni, Chao Jiang*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 91-91, 2019, DOI:10.32604/icces.2019.05517
    Abstract Uncertain parameters with inherent spatial variability are commonly encountered in engineering. These include material properties of the heterogeneous media such as concrete or porous rock, external loads such as wind or snow loads applied on structures, etc. This type of uncertain parameters is traditionally quantified by the random field model, while the large amount of information required in construction of the precise probability distribution functions is often difficult to obtain for many practical engineering problems. The authors propose an interval field model to represent the spatial uncertainties with insufficient information, in which the variation of the parameter at any location… More >

  • Open Access

    ABSTRACT

    Direct Interval Multi-Objective Optimization Method for Uncertain Structures

    Guiping Liu*, Sheng Liu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 92-92, 2019, DOI:10.32604/icces.2019.05523
    Abstract In engineering multi-objective optimization of structures, the parameters involved in the problems are usually given deterministic values. However, due to the presence of manufacturing and measurement errors, uncertainty inevitably exists in the geometrical properties of the structure, the material properties, the boundary conditions, etc. For uncertain problems, the interval optimization methods are widely used. They describe the uncertainty by intervals which only need to find the upper and lower bounds of the uncertain parameters instead of constructing the exact probability distribution function. However, in multi-objective optimization problems, if considered all the upper and lower bounds of the objective functions as… More >

  • Open Access

    ABSTRACT

    Thin Film Formation and Photovoltaic Application of Transition Metal Dichalcogenides By Liquid Exfoliation

    Seung Kyo Lee, Dongil Chu, Eun Kyu Kim*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 93-93, 2019, DOI:10.32604/icces.2019.04995
    Abstract We studied on a liquid exfoliation technique for the robust production of transition metal dichalcogenides (TMDC) thin films, because this technique has advantages for residue-free, large-scale, and low-cost fabrication. During the process of liquid exfoliation, a mixture of DI water and ethanol was used to obtain higher concentrations of TMDC flakes in the solution compared to that in water-based solution. The film thicknesses were controlled by a two-step centrifuge process to analyze the influence on the photovoltaic properties with gold/TMDC/silicon geometry. Based on ultraviolet photoelectron spectroscopy measurement results, the energy band diagram of the devices using MoS2 and WS2 films… More >

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