Home / Journals / ICCES / Vol.17, No.1, 2011
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  • Open Access

    ABSTRACT

    Towards Continuum Modeling from Atomistic Principles

    George Fitzgerald, Michael Doyle
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 1-2, 2011, DOI:10.3970/icces.2011.017.001
    Abstract Molecular modeling can provide a detailed understanding of structures, properties, and processes for materials as diverse as organic molecules, polymer blends, or alloys. Yet, these methods have generally been restricted to length scales of 100 nm and time scales of 10-6 seconds, which limits their usefulness for research problems on the engineering scale. In this work, we discuss several approaches for extending their domain of applicability to the macro-scale.

    Enhancements to atomistic modeling methods make it possible to apply accurate atomistic models to problems in electronics materials, alloys, and polymers. Statistical methods such as Quantitative Structure-Activity Relationships (QSAR) extend… More >

  • Open Access

    ABSTRACT

    Residual Stress Measurement of Thermal Barrier Coatings

    Jianguo Zhu, Huimin Xie, Fulong Dai
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.017.003
    Abstract Thermal barrier coatings (TBCs) are widely used in turbines for propulsion and power generation. During build up the coatings, the continuity of the strain at the interface results in the residual stress because of the thermal expansion misfit. Since the formation of residual stresses cannot be avoided, they have to be optimized by adaptation of the process parameters during coating manufacturing. Therefore, in order to obtain information about the characterization of residual stresses for specific process conditions, the development of residual stress measurement is of vital importance.

    In this paper, several techniques on residual stress measurement are reviewed, including… More >

  • Open Access

    ABSTRACT

    The Superconvergence of Certain Two-Dimensional Cauchy Principal Value Integrals

    Jin Li, Dehao Yu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 5-6, 2011, DOI:10.3970/icces.2011.017.005
    Abstract The composite rectangle (midpoint) rule for the computation of multi-dimensional singular integrals is discussed, and the superconvergence results is obtained. When the local coordinate is coincided with certain priori known coordinates, we get the convergence rate one order higher than the global one. At last, numerical examples are presented to illustrate our theoretical analysis which agree with it very well. More >

  • Open Access

    ABSTRACT

    Study on micromixing and reaction process in a rotating bed

    ZHANG Jian-wen, LI Ya-chao, CHEN Jian-feng
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 7-8, 2011, DOI:10.3970/icces.2011.017.007
    Abstract The exploration on the microscale transport phenomena in RPB is of significance to understand the mechanism of microscale mixing and chemical reaction therein. On the basis of previous studies, numerical simulation is carried out and the numerical results are compared with the experimental results in this paper to indirectly determine the thickness of the liquid film. Appropriate modification on the rotational component of the velocity of the liquid film is proposed and the numerical result is in reasonable agreement with the experimental result. The fluid flow and the species transfer with a parallel reaction are studied to obtain the evolution… More >

  • Open Access

    ABSTRACT

    Experimental Study on Dynamic Collision of Nuclear Graphite Bricks

    WANG Hong-tao, SUN Li-bin, WANG Haitao, MA Shao-peng
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 9-10, 2011, DOI:10.3970/icces.2011.017.009
    Abstract Nuclear graphite is a fine high-temperature structural material, so it has been widely used to manufacture graphite bricks of the reflectors in high temperature gas-cooled reactors (HTGRs). Since graphite bricks are stacked together and interconnected by keys and keyways, the collision between graphite bricks will happen when the seismic load or other load is applied. In order to study the collision behavior, a collision test system was built. The velocities of two graphite bricks were measured by a high-speed image capturing technology, and the coefficient of restitution and contact time was obtained by the velocity-time curve. The experimental results show… More >

  • Open Access

    ABSTRACT

    Numerical and theoretical studies of the buckling of shape memory tape spring

    Zhengfa Li, Weibin Song, Zhengdao Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 11-12, 2011, DOI:10.3970/icces.2011.017.011
    Abstract By using the high froze/recovery strains of shape memory polymers to meet the requirements of deployable space structures, the folding behavior of shape memory tape spring structures consisting of shape memory polymer and metal spring was analyzed. Firstly, numerical simulations were performed on the buckling modes and affecting factors under the equal- and opposite-sense bends. The results show that the folding deformations of such structure in the two cases are completely different. The equal-sense bending leads to the structure buckled abruptly, but gradual torsion buckling is received in the case of opposite-sense bending. The critical bending moments have big difference… More >

  • Open Access

    ABSTRACT

    Synthesis and experimental research of shape memory epoxy series

    L.Y. Wang, W. B. Song Z.D. Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 13-14, 2011, DOI:10.3970/icces.2011.017.013
    Abstract Shape memory epoxies and their composites have great potential applications in future deployable space structures industry. In this study six types of shape memory epoxies with different shape transition temperatures were synthesized by varying the curing agents and their contents. Thermal frozen/recovery test, DSC and DMA were performed to investigate their shape memory behaviors and thermomechanical properties. Further discussions about the testing results were presented with consideration of the microstructure. More >

  • Open Access

    ABSTRACT

    Models for Calculating Composition of Alloy in Liquid Phase Epitaxy Considering Forced-convection

    Hiromoto Susawa
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 15-16, 2011, DOI:10.3970/icces.2011.017.015
    Abstract Liquid Phase Epitaxy is a crystal growth on a substrate from liquid solution, which is a melt in this paper. Before growth, a melt is separated from a substrate and supercooled. When growth starts, the melt moves to the substrate. This induces flow in the melt. This paper considers the influence of flow on the composition of solid phase, reviews previous simulation models and introduces a new model. A one-dimensional model explained an experimental result and a major behavior of solid compositional variation. A semi-two-dimensional (semi-2-D) model dealt with transport in the melt as 2-D but substituted the values at… More >

  • Open Access

    ABSTRACT

    Modelling Dynamic Behaviour of Thermally Bonded Bicomponent Fibre Nonwovens

    Emrah Demirci, Memi AY Acar, Behnam Pourdeyhimi, Vadim V.Silberschmidt
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 17-19, 2011, DOI:10.3970/icces.2011.017.017
    Abstract Nonwovens are polymer-based engineered textiles having randomly distributed fibres bonded together with mechanical, thermal or chemical techniques. This paper focuses on thermally bonded nonwoven fabrics manufactured with bicomponent fibres. Such fibres have a core/sheath structure, with a material of the inner region - core - having a higher melting temperature than that of the surface region (sheath). During the bonding of these fibres, a hot calender with an engraved pattern contacts a fibre web causing the sheath part of fibres to melt; the latter acts as an adhesive while the fibres' core part remains fully intact. As a result of… More >

  • Open Access

    ABSTRACT

    Research and application of the slope stability under mining in the South of the Antaibao open-pit mining, China

    Zhu Jianming, Zhang Hongtao, Wang XiChun, XU Bingye
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 20-20, 2011, DOI:10.3970/icces.2011.017.020
    Abstract Aiming at the limitation and the insufficiency of the research methods for the slope stability in the open-pit and underground combined mining, firstly according to the characteristic of the slope stability in the open-pit and underground combined mining, and the limit analysis method of the slope stability based on the upper bound theorem of the plasticity mechanics, the maneuvering displacement field for the subsidence rock mass of the underground long-wall mining is established, for the subsidence rock mass the function equation is established using the plastic limit analysis method. Secondly, using this method this paper researches the surface subsidence rock… More >

  • Open Access

    ABSTRACT

    Estimation of the residual stiffness of fire-damaged concrete members

    Zhu Jianming, Wang XiChun, Wei Dong, Liu Yinghua, XU Bingye
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 21-22, 2011, DOI:10.3970/icces.2011.017.021
    Abstract The residual stiffness of concrete member after fire is a very important parameter of the load-bearing ability and seismic performance of fire-damaged concrete structures. It is also one of the most important criteria for repairing and reinforcing the fire-damaged concrete structures. Based on the equivalent elastic modulus method, improved segment model method and parameter inversion method developed in this paper, the residual stiffness of concrete members exposed to standard fire is calculated and the effects of fire duration, steel ratio and section size on the stiffness are also presented in detail. The results show that these three methods can easily… More >

  • Open Access

    ABSTRACT

    Application of a Multiple Well-Injection Approach for CO2 Sequestration in a Saline Reservoir

    Chien-Hao Tseng, Chia-Chen Kuo, Wei-Chih Su, Fang-An Kuo, Keni Zhang, Chuan-Lin Lai
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.017.023
    Abstract The high-performance parallel computing scheme has already been increasingly recognized as an attractive alternative method to resolve the large-scale problems of CO2 sequestration. This paper therefore conducts a parallel computation for simulating multiple well-injection scenarios and long-term CO2 geologic sequestration in a saline aquifer (Figure 1a) based on the ECO2N module of the TOUGH2-MP that is the parallel version of TOUGH2 implemented by the MPI. The numerical performance of TOUGH2-MP is developed on an IBM Cluster 1350 which is composed of 404 nodes and 2 Intel Woodcrest 3.0 Ghz Dual-Core processors per node. Our results indicate that the high-speed parallel… More >

  • Open Access

    ABSTRACT

    The spatial laser interferometry with combination of fast Fourier transformation technique applied to measuring micro object 3D profile

    Xianfu Huang, Zhanwei Liu, Jianxin Gao, Huimin Xie
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.017.025
    Abstract The spatial laser interferometry with combination of fast Fourier transformation (FFT) technique has been applied to analyze and reshape 3D profile of micro objects in this paper. In this technique, two beam of coherent spatial laser would superpose and interfere with each other to produce fringes with constant pitches. Deformed fringe lines would be generated on a tested object surface for its 3D height existence when a micro-movable platform with the tested object on it is placed in the spatial interferential fringe field. On the analysis of the fringe pattern collected by CCD which carries not only the 3D height… More >

  • Open Access

    ABSTRACT

    Carrying Capacity of Pressure Vessels under Hydrostatic Pressure

    Yang-chun DENG, Gang CHEN
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 27-28, 2011, DOI:10.3970/icces.2011.017.027
    Abstract To use material effective and keep pressure vessel safety, large deformation analysis for pressure vessel is very important. Until 2007, the elastic-plastic stress analysis method, that is the first time all over the world, is provided in ASME a.?-2 edition 2007 for boiler and pressure vessel standard that Finite Element Method is used with large deformation analysis. But there is no common recognized direct solution for the carrying capacity of pressure vessels yet and this restrict the application of large deformation analysis in pressure vessel design. This paper investigates the carrying capacity of pressure vessels under hydrostatic pressure, based on… More >

  • Open Access

    ABSTRACT

    The Propagation of Torsional Guided Wave in Oil-Filledand Viscoelastic Coating Pipe Surrounded by Water

    LIN Xiao-Ping, LEI Zhen-Kun, LIU Zeng-Hua, WU Zhan-Jun
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 29-30, 2011, DOI:10.3970/icces.2011.017.029
    Abstract Recently, a technology named ultrasonic guided wave has a rapid development and wide application. It is more and more popular for the advantage compared with traditional detection. An enormous amount of work has contributed to our current understanding of wave propagation. The case of a hollow cylinder loaded by the outside liquid has been considered by Rose et al. Kwun investigated the propagation of guided waves in water filled pipes. C. Aristegui discussed propagation of guided waves in fluid-filled pipe surrounded by different fluids. Lafleur and Shields have studied the propagation of low frequency modes in a liquid-filled tube.

    More >

  • Open Access

    ABSTRACT

    Large deformation contact of a soft material with a rigid indenter by digital moirAC method

    Xiaohua Tan, Yilan kang*, Ganyun Huang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 31-32, 2011, DOI:10.3970/icces.2011.017.031
    Abstract Soft materials are a special class of materials between the ideal fluid and solid (Gennes, 1992), comprising a variety of physical states that are easily deformed by mechanical loading or thermal fluctuations. They are increasingly important in a wide range of technological applications, and the related contact problem is rather complex due to geometrical and material nonlinearities and complicated boundary conditions. Measuring, characterizing, and modeling the contact behavior of soft materials is still a challenging topic for engineering researchers. In this work, through combination of digital moirAC method and inner-grating approach an experimental technique has been developed for measuring and… More >

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