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ABSTRACT

Zhifan Zhang^*, Haoliang Hu, Cheng Wang^*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 46-46, 2019, DOI:10.32604/icces.2019.06145
Abstract A metal jet can be formed for a shaped charge subjected to air blast, which can cause local damage on structures. As for the high-velocity jet associated with underwater explosion, a high-pressure shock wave and a long-term bubble can be also generated. Underwater structures can be severely damaged by these three loadings. A Smooth Particle Hydrodynamic (SPH) method has advantages of solving problems of large deformations thanks to its mesh-free Lagrange formulation. Therefore, it is applied to simulate an entire process of a metal-jet penetration into underwater structures. First, a verification of near-field underwater explosion was carried out. The obtained… More >

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851

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Jinqing Zhao¹, Tianbao Ma^*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 47-47, 2019, DOI:10.32604/icces.2019.06150
Abstract We describe a pseudo arc-length algorithm for numerical resolution of immiscible compressible multi-material flows with the Mie-Grüneisen type equation of state (EOS) governed by the quasi-conservative five-equation model. The governing equation is discretized in space uses the finite volume approach with a second-order accurate Godunov scheme. Time discretization is achieved using the strong stability-preserving high-order Runge-Kutta time discretization scheme. The five-equation model with the Mie-Grüneisen EOS is general enough to model materials with different equations of state and physical states. However, for long simulations, the interface of materials is indistinct because of numerical dissipation. The interfacial compression method is used… More >

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744

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Zhen Chen^1,2
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 48-48, 2019, DOI:10.32604/icces.2019.06164
Abstract Multi-phase transient interactions play an important role in modern engineering applications such as additive manufacturing, drilling, hydrofracturing, impact and penetration. It has been shown that the evolution of interfacial failure between different material phases has the nonlocal feature [1], namely, the stress state at a material point depends on the strain distribution around that point in a representative volume of certain size. Hence, local constitutive models cannot predict the real physics associated with interfacial failure evolution. On the other hand, the mesh-based methods cannot describe the real physics involved in the interfacial problems, due to the use of master/slave nodes… More >

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747

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Xiaoyue Yang¹, Shuang Xu^1,*, Qiwen Liu¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 49-49, 2019, DOI:10.32604/icces.2019.04889
Abstract In this study, molecular dynamics simulations were performed to study the uniaxial compression deformation of magnesium nanopillars with square and triangular surface notches. The generation and evolution process of internal defects of magnesium nanopillars was analyzed in detail. The results indicated that the triangular notches had little effect on the deformation behavior of magnesium nanopillars, and the governing mechanism of plastic deformation was the initiation and motion of pyramidal dislocations. As for magnesium nanopillars with square notches, the initial plastic deformation was mainly caused by the pyramidal slip. After the notches were closed, {10̅11} <10̅12> twins were observed, the expansion… More >

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788

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John D. Clayton^1,2,*, R. Brian Leavy¹, Jaroslaw Knap³
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 50-52, 2019, DOI:10.32604/icces.2019.05118
Abstract Diffuse interface models and simulations capture deformation and failure of polycrystalline ceramics with multiple phases. Two heterogeneous ceramic solids are investigated. The first consists of a boron carbide matrix phase embedded with titanium diboride grains. The second consists of diamond crystals with a smaller fraction of silicon carbide grains, where the latter may encapsulate the former in a micro- or nano-crystalline matrix and/or may be interspersed as larger micro-crystals. A general constitutive framework suitable for representing behaviors of all phases of each material system is reported. This framework is implemented in three-dimensional (3D) finite element (FE) simulations of polycrystalline aggregates… More >

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1021

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798

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Ying Mao^1,*, Ming-Hisao Lee², Wen-Hwa Chen¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 53-53, 2019, DOI:10.32604/icces.2019.05306
Abstract 3D printing technology is mainly designed to fabricate irregular-shaped targets, but it undergoes an issue of unavoidable thermal residual stress and may induce serious warping and distortion. To guarantee the quality of the printing 3D irregular-shaped parts, a novel meshless analysis procedure is therefore established in this work. With certain checking mechanisms devised, the nodes used by the meshless analysis are appropriately chosen to represent the irregular geometry of printing parts and fit the growing situation in the printing process. As verified by the temperature measurement in the printing process, uniform temperature of each layer is assumed and the thermal… More >

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763

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Kuan-Peng Chen^1,3, An-Cheng Yang^1,3, Wen-Jay Lee¹, Yi-Ming Tseng², Nien-Ti Tsou², Nan-Yow Chen^1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 54-54, 2019, DOI:10.32604/icces.2019.05401
Abstract Crystallographic classification of microstructure is a very important issue in material science especially numerous data were generated by experiments or Molecular Dynamic (MD) simulations. Some analysis tools were purposed, such as coordination analysis and Honeycutt-Anderson (HA) pair analysis [1], however, to analyze these huge amounts of data is still quite difficult. Sometimes, crystallography prior knowledge of their structures is also desired in the classification procedures. Not only the task is very labor intensive but also the result is susceptible to errors and is usually lack of objectivity. In this study, we developed a computational workflow which can get characteristic quantities… More >

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700

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Hsin-Yu Chen, Nien-Ti Tsou^*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 55-55, 2019, DOI:10.32604/icces.2019.05403
Abstract Shape memory alloys has been widely applied on actuators and medical devices. The transformation temperature and microstructural evolution play the crucial factors and dominate the behavior of shape memory alloys. In order to understand the influence of the composition of the Ni-Ti on the two factors, molecular dynamics (MD) is adopted to simulate the temperature-induced phase transformation in the current study. In addition, the results are post-processed by the martensite variant identification method. The method allows to reveal the detailed microstructural evolution and the volume fraction of each variant/phase in each case of the composition of Ni-Ti. Many features that… More >

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747

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Wei-Chun Wang¹, Tzu-Han Ma¹, Chang-Wei Huang², Nien-Ti Tsou^1,*
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 56-56, 2019, DOI:10.32604/icces.2019.05409
Abstract In recent years, the improvement of biomedical materials and their applications have gained much interest and been broadly discussed. Hydrogel, gelatin methacrylate (GelMa), is one of the applications with the greatest potential, such as cell culture, and studied by many researchers. In this study, a system consisting of GelMa and the special particles which can be aligned by applying electric field is developed. The alignment of the particles can alter the curvature of the GelMa substrate. The proposed system which provides the mechanical stimulus to the cell attached on the system due to different deformation curvatures can be used as… More >

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968

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705

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Chang-Wei Huang
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 57-57, 2019, DOI:10.32604/icces.2019.05418
Abstract This paper focuses on the interface energy release rate of elastic multilayered beam subjected to four-point bending. Linear elastic fracture mechanics (LEFM) and extended finite element method (XFEM) are adopted to investigate the interface fracture of composite beams. Numerical results obtained from simulations not only verify the accuracy of closed-form solutions for the steady-state interface energy release rate, but also provide the evolution history of interface energy release rate under different crack length. In addition, non-dimensional parametric analyses for interface fracture energy release rate are carried out for the discussion of effects of crack length ratio, elastic modulus ratio, and… More >

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802

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Yasunori Yusa^1,*, Tomoshi Miyamura², Tomonori Yamada³, Shinobu Yoshimura³
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 58-58, 2019, DOI:10.32604/icces.2019.05231
Abstract In a wind turbine blade, laminated plates consisting of fiber reinforced plastic materials are generally used due to its high specific strength. We have been developing a large-scale finite element solver to analyze the wind turbine blade structure. For such a structure, the laminated finite element is frequently used in modeling. Each laminated finite element has multiple layers, each of which is an orthotropic body in order to model the layered fiber reinforced materials with different fiber directions. Also, since a realistic wind turbine blade structure generally requires a large number of finite elements for discretization, we adopted a domain… More >

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714

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Zumei Zheng¹, Naoto Mitsume¹, Guangtao Duan¹, Shunhua Chen^1,*, Tomonori Yamada¹, Shinobu Yoshimura¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 59-59, 2019, DOI:10.32604/icces.2019.05279
Abstract The interactions between fluids and complicated solid structures are common phenomena in practical engineering applications, e.g., water-tire interaction in the hydroplaning problem. In this work, we advocate the coupled explicit moving particle simulation method and the finite element method (EMPS-FEM) to solve this problem, where the EMPS is used to describe the fluid flow and the FEM is for structural deformation. In the existing EMPS-FEM method, the interface interaction between the fluid and the structure is solved by an explicitly represented polygon (ERP) wall boundary model. For the situations with complicated solid structures, e.g.,angled edges, the ERP model attempts to… More >

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809

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Shunhua Chen^1,*, Shinobu Yoshimura¹, Kaworu Yodo², Naoto Mitsume¹, Yasunori Yusa³, Tomonori Yamada¹, Chisachi Kato⁴, Shori Orimo⁴, Yoshinobu Yamade⁵, Akiyoshi Iida⁶
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 60-60, 2019, DOI:10.32604/icces.2019.05361
Abstract With the pressing requirement of wind energy capacity, the wind turbine blade size has been getting larger and larger in recent decades. For such a large-size blade, it is of prime importance to accurately evaluate the mechanical response under various wind loading conditions. In this work, we present a computational framework to achieve this end. Firstly, a finite element model for a 5MW blade is established according to the well-known NREL report. A composite laminated element is adopted to describe the blade structure. The effectiveness of this model is validated by means of eigenfrequency analysis. Secondly, a one-way partitioned FSI… More >

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885

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Tomonori Yamada^*, Yuki Yamamoto, Giwon Hong, Shinobu Yoshimura
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 61-61, 2019, DOI:10.32604/icces.2019.05386
Abstract This paper describes performance study of a mesh moving technique with minimum-height-based stiffening for robust fluid-structure interaction (FSI) analysis with large deformation. The authors have been developing a general purpose parallel FSI analysis system for large scale problems with interface tracking approach and applied it to the analyses of flapping motion of micro air vehicles, fuel assemblies of the boiling water reactors under seismic loading, wind turbines and so on. The practical use of FSI analysis system requires the robustness for the parametric design of various mechanical systems. In this context, mesh moving technique is a key for avoiding the… More >

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949

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Kazuki Abe^*, Hideki Fujii, Shinobu Yoshimura
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 62-62, 2019, DOI:10.32604/icces.2019.05393
Abstract Traffic simulations are utilized as support tools to solve traffic-related problems. Scenario analysis is one of the analysis methodologies with simulation. At the first step of scenario analysis, traffic phenomena in the real world should be reproduced in the simulation world as the baseline. Traffic demand, which can be described as a form of the Origin-Destination (OD) matrix, is an important element in the traffic phenomena, which affects directly to the traffic volume or congestion, but it cannot be observed directly. Whereas some OD estimation methods are proposed, most of them require different route-search models or scopes from simulation. Therefore,… More >

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740

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Hideki Fujii^*, Yuta Ushimaru, Tomonori Yamada, Shinobu Yoshimura
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 63-63, 2019, DOI:10.32604/icces.2019.05442
Abstract In order to evaluate transportation policies quantitatively, virtual social experiments using traffic simulators are adequate. In particular, simulators with features of both precision and scalability are preferable for applications to real-world and wide-spread traffic phenomena. In this research, we tried to parallelize a multi-agent-based traffic simulator (ADVENTURE_Mates) and enhance its parallelization performance. In the simulator, a road map is modeled as a graph and cars are modeled as autonomous agents. A car agent acquires information from its circumference (other cars, traffic lights, etc.), makes a decision autonomously, and acts based on the decision. The precision is accomplished by employing a… More >

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728

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ABSTRACT

Hiroshi Kawai¹, Shinichiro Sugimoto², Amane Takei³
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 64-64, 2019, DOI:10.32604/icces.2019.05530
Abstract In any ancient society whose economy is mainly driven by agriculture, the production of foods, such as wheat, potato and rice is an essential factor in defining its economics as well as demographics. We are now trying to simulate the demographics and economics of the Japanese ancient agricultural society during 0-1850 A.D., from the primitive era (Yayoi) to the last part of Edo era, when the general was still governing this country. At that time, the society depended heavily on the rice production along river areas. The multi-agent and cell automaton simulation is performed over Japanese islands, and the distribution… More >

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945

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681

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Naoto Mitsume^*, Tomonori Yamada, Shinobu Yoshimura
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 65-65, 2019, DOI:10.32604/icces.2019.05538
Abstract Research and development with regard to advanced coal-fired power plants to reduce CO2 emission have been conducted. Coal gasification is one of the key technologies. In reactor for the coal gasification, coal is crushed into fine particulate matter and then partially burned into gas in a high-pressure environment in the reactor. Our research group has carried out a project to tackle a coupled problem of thermo-fluid-structure interaction for quantification of its efficiency, environmental load, and structural integrity. As one of key components of the project, we present a large-scale parallel simulation of three-dimensional (3D) thermal conduction in a gasification vessel.… More >

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1033

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735

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D. Ishihara
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 66-66, 2019, DOI:10.32604/icces.2019.05888
Abstract This study shows that some of important characteristic motions in insect flapping wings can be created by the fluid-structure interaction. A lumped flexibility model is used to describe the flexibilities in insect’s wings. A three-dimensional finite element method for the fluid-structure interaction analyzes the behaviors of the model wing, the surrounding fluid, and their interaction, where the dynamic similarity law for the fluid-structure interaction is used to incorporate actual insect data. This finite element method uses the projection and parallel computation algorithms, which perform the systematic parametric study efficiently. The elastic recoil and the modes in the path of the… More >

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706

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Hideaki Uchida^*, Hideki Fujii, Shinobu Yoshimura
The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 67-67, 2019, DOI:10.32604/icces.2019.05902
Abstract In recent years, EVs (Electric Vehicles) with high environmental performance has been popularized. To realize a low-carbon and sustainable society, EVs are expected to play major roles, and it is essential to use renewable energy for their charging effectively. Interactions between the transportation network and the electric power system have not been considered so far. However, the interactions are supposed to occur via EVs, which will popularize in the near future. Most of the previous studies about EVs’ popularization focused on either the transportation or the electric power system, and no sufficient simulation model has been studied. In this research,… More >

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