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  • Open Access

    ABSTRACT

    The measurement method of node density and its application

    Yufeng Nie, Yu Zhang, Yiqiang Li, Gu YT

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 123-124, 2011, DOI:10.3970/icces.2011.019.123

    Abstract When the set of nodes distributed randomly is applied to approximate function, the size of the domain support of point has a great influence on the validity and accuracy of approximation. In order to study the radius of the support domain, this paper gives a new concept of the node density firstly, which not only can characterize the density level of distribution of the node and its calculation algorithm is simple, but also is easy to determine the radius of the support domain; Secondly, based on the concept of the node density, an algorithm which is used to search nodes… More >

  • Open Access

    ABSTRACT

    Development of the coarse-grained particle method and its application to compression-wave propagation in metal

    Takahide Nakamura

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 115-116, 2011, DOI:10.3970/icces.2011.019.115

    Abstract No limitation exists virtually in target size for the classical simulation of atoms with the O(N) algorithms on parallel machines. On the other hand, the time step cannot be changed and hence the total simulation time still remains short. It is meaningful to increase the time step by the coarse-graining the atomic system. The coarse-grained particle (CGP) method has been proposed for such purposes, but it is applicable only to crystalline solids at zero-temperature limit [1,2]. The total energy of the CGP system is defined as the statistical ensemble average of the atomistic Hamiltonian under some certain constraint. For analytic… More >

  • Open Access

    ABSTRACT

    High-speed 3-Dimensional Digital Image Correlation System and Its Application to the Measurement of High Speed Projectile

    Zeng Xiangfu, Ma Shaopeng, Ma Qinwei, Chen Pengwan

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 111-112, 2011, DOI:10.3970/icces.2011.017.111

    Abstract In order to measure the attitude parameters of the projectile, a high-speed 3-dimensional digital image correlation (H3D-DIC) system is designed and constructed. In the H3D-DIC system, two high-speed cameras are used to capture the images of the projectile from two different directions and the 3-dimensional coordinates of the markers painted on projectile are obtained by processing the images using stereovision techniques. Because of the difference on the resolution of the two cameras, the images captured are with different magnification. Therefore, a new correlation program, in which the parameter of pixel size is also included in the correlation schedule, is designed… More >

  • Open Access

    ABSTRACT

    Investigation of Stress Auto Separating Method in Digital Photo-elasticity and Its Application in Contact Problem

    Ke JI, nlong Chen, Lina Zhang, Xinhua Ji

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 35-36, 2011, DOI:10.3970/icces.2011.017.035

    Abstract The Stress distribution of contact area in engineering structure is complex. Automatic whole-field measurement of photo-elasticity is a feasibility method to solve the contact problem. However, the problem of isoclinic and isochromatic interaction is important in phase-shifting techniques in photo-elasticity. The technique named 8-step phase shifting technique is applied to solve the problem of isoclinic fringe pattern influenced by isochromatic fringe patterns in integer order and half-integer order. Isoclinic parameter in the range of [0,I/2] is given by the method.

    Based on the eight-step phase shifting technique, some methods to determine the first principal stress direction of the model… More >

  • Open Access

    ABSTRACT

    Active thermography based integrated system for Nondestructive testing and evaluation and its applications

    Y.S. Chen, Y.H. Huang, B. Yeung, L. Liu, Y.Y. Hung

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 21-22, 2011, DOI:10.3970/icces.2011.020.021

    Abstract Active thermography is an optical-based non-contact inspection method for full-field and quantitative measurement of surface radiation to predict potential faults or inner structure of a test object. The mechanism of the active thermography inspection is to excite the test object using appropriate thermal excitation methods and measure the corresponding thermal response. Active thermography conducts testing in a more controllable way and offer more reliable results compared to passive thermography. This paper reports the development of integrated systems featured some advanced excitation methods and thermal image processing methods. Experiments have been conducted on samples with disbonds, delaminations, internal cracks or voids,… More >

  • Open Access

    ABSTRACT

    The Development of a Shearography Device and Its Applications

    Dongsheng Zhang

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 5-6, 2011, DOI:10.3970/icces.2011.020.005

    Abstract Composites which are considered to be a sort of high-performance materials have been used in the aerospace industry, as well as other industries. Due to the high quality standards and the applicable safety purposes, highly precise and non-destructive test methods are highly demanded for both manufacturing and maintenance. This talk describes the portable shearography device which is developed in Shanghai University. The laser projection and inspection sensor are integrated and mounted on the tripod to meet the requirement of field inspections. Two loading systems including thermal and vibrating are introduced to achieve repeatable test results. Real-time phase shifting dramatically improves… More >

  • Open Access

    ABSTRACT

    Numerical modeling of resin film infusion process with compaction and its application

    Duning Li, Yufeng Niei?a, Xuemei Zhou, Li Cai

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 75-76, 2011, DOI:10.3970/icces.2011.019.075

    Abstract In this study, the efficient discrete model including the resin infusion and the fiber compaction is developed to simulate the RFI (resin film infusion) process. The non-linear governing equations are derived by the Darcy's law, the Terzaghi's law and the continuity equations. The finite element method and the finite difference method are used to discretize the proposed equations, and the VOF method is used to track the filling front. Compared with the analytical results of Park, our numerical results agree well with them. Furthermore, we analyze the RFI process of BMI/G0814, and simulate the resin pressure, the fiber volume fraction… More >

  • Open Access

    ABSTRACT

    The multiscale analysis of polycrystalline metals and its interface with a-Al2O3 under tension

    Qin Siwei, Shen SP

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.2, pp. 53-54, 2011, DOI:10.3970/icces.2011.019.053

    Abstract Among many multiscale methods ,we choose the quasicontinuum method to understand the mechanical response at the nanocrystalline of grain boundaries(GBs) under tension. The energetic and mechanical strength of 6 i?"<110> symmetric tilt GBs are investigated in nanocrystalline Cu and Ni. We focus on discussing the interaction of the structural units of symmetric tilt GB for the initial deformation mode and the strength of model. At the basis of the previous, We study the nanocrystalline Cu/a-Al2O3 interface and analyze the relationship during the grains orientations, GB energy and interface. Special emphasis is placed on the crystal slip from the interface across… More >

  • Open Access

    ABSTRACT

    Three-Dimension excitation model of mechanism of mines seismic and its application

    JIA Bao-xin, PAN Yi-shan, LI Guo-zhen

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.4, pp. 109-110, 2011, DOI:10.3970/icces.2011.016.109

    Abstract Currently mines seismic emergence mechanism is unclear. To solve this problem, the article analyzes the occurring mechanism of mines seismic and studies the mines seismic classification. Meanwhile we establish three-Dimension excitation model of mines seismic, then derive the propagation model of mines seismic. Research shows that Coal-rock mass produced brittle fracture when outside force to exceed its ultimate strength in complex stress, after the release of energy generate mines seismic. The establishment of the model explains mines seismic occurrence mechanism, and provides the theoretical foundation for mines seismic magnitude calculation and accurate Orientation in the future. More >

  • Open Access

    ABSTRACT

    A Novel Constitutive Equation for Inverse Analysis Method and its Application in Sheet Metal Forming

    Xiaoyang LU, Bingtao TANG

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.2, pp. 37-38, 2011, DOI:10.3970/icces.2011.016.037

    Abstract Bending movements will be caused when elements passing by die entrance radius. The classical inverse analysis method (CIAM) uses the constitutive equation based on deformation theory of plasticity. Based on the assumption of the proportional loading, Hencky deformation theory is adopted. The secant modulus is obtained from uniaxial tensile curve and the plastic strain rate can be directly integrated to obtain a total plastic strain expression. The CIAM of sheet metal stamping has the shortcomings of no consideration of the effects of deformation history on stress prediction. Therefore, there is some discrepancy between the stress calculated with CIAM and that… More >

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