Home / Journals / ICCES / Vol.17, No.4, 2011
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  • Open Access

    ABSTRACT

    The Coupling Method with the Natural Boundary Reduction on an Ellipse for Exterior Anisotropic Problems

    Quan Zheng, Jing Wang, Jing-ya Li
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 101-102, 2011, DOI:10.3970/icces.2011.017.101
    Abstract This paper investigates the coupling method of the finite element and the natural boundary element using an elliptic artificial boundary for solving exterior anisotropic problems, and obtains new error estimate that depends on the mesh size, the location of the elliptic artificial boundary, the number of terms after truncating from the infinite series in the integral. Numerical examples are presented to demonstrate the effectiveness and accuracy of this method. More >

  • Open Access

    ABSTRACT

    Effect of Loading Frequency on Fatigue Properties of Ni-base Super Alloy Inconel 718

    N. Yan, N. Kawagoishi, Y. Maeda, Q. Chen
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 103-104, 2011, DOI:10.3970/icces.2011.017.103
    Abstract Fatigue tests under rotating bending and ultrasonic loading were carried out using plain specimens with different grain sizes of Ni-base super alloy, Inconel 718, in order to investigate the effects of grain size and loading frequency on fatigue properties. Fatigue strength was increased with decreasing in grain size under both tests. Moreover, the fatigue strength under ultrasonic loading was higher than that under rotating bending. The resistance to crack initiation was larger in smaller grain sized alloy under both tests, and larger under ultrasonic loading than under rotating bending. Effects of loading frequency and grain size on crack initiation were… More >

  • Open Access

    ABSTRACT

    Flow Simulations by a Particle Method Using Logarithmic Weighting Function

    K. Kakuda, J. Toyotani, S. Matsuda, H. Tanaka, K. Katagiri
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 105-106, 2011, DOI:10.3970/icces.2011.017.105
    Abstract The application of a particle method to incompressible viscous fluid flow problems is presented. The method is based on the MPS (Moving Particle Semi-implicit) scheme using logarithmic weighting function. Numerical results demonstrate the workability and the validity of the present approach through incompressible viscous fluid flow in a driven cavity and flow behavior in a liquid ring pump with rotating impeller blades. More >

  • Open Access

    ABSTRACT

    A three dimensional efficient Galerkin mshfree formulation for large deformation analysis of soil slope failure

    Dongdong Wang, Zhuoya Li, Youcai Wu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 107-108, 2011, DOI:10.3970/icces.2011.017.107
    Abstract Meshfree methods have experienced substantially fundamental development and various applications. One distinguished advantage for meshfree methods is that they can relieve the mesh tangling burden of FEM and are more suitable for finite deformation analysis. In this work a three dimensional updated Lagrangian Galerkin meshfree formulation with improved computational efficiency is presented to analyze the failure of soil slopes. This nonlinear meshfree formulation is featured by the Lagrangian stabilized conforming nodal integration method where the low cost nature of nodal integration approach is kept and at the same time the numerical stability is obtained as is not the case for… More >

  • Open Access

    ABSTRACT

    Design of The Ternary Link in Six-bar Mechanical Presses

    Pei-Lum Tso, Wei-Shiang Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 109-110, 2011, DOI:10.3970/icces.2011.017.109
    Abstract Different stamping tasks require different punch motions and always require different press machine. This paper uses a novel computer-aided design approach to study the role of ternary link (members with three revolute joints) in the Stephenson III six-bar mechanical press and its relationship with the punch motions. Based on the theory of three precision positions function and path generation synthesis for four-bar mechanism, a computer program have been developed to find the acceptable ternary link lengths according to the given ram displacement diagrams. The results show that to change the dimension of the ternary link can get various punch motions… 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

    Mesh based digital image correlation method using 8-node isoparametric element

    Zhao Zilong, Ma Shaopeng, Wang Xian
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 113-114, 2011, DOI:10.3970/icces.2011.017.113
    Abstract As one of the most important photomechanics experimental methods, digital image correlation (DIC) has been widely used in various areas for displacement and deformation field measurement. The main idea of DIC is to resolve the displacement of speckle patterns by independently matching the corresponding patterns on reference and deformed speckle images. In order to add the continuity between the matching of the adjacent patterns, the mesh based DIC (abbreviated mesh-DIC hereafter), in which the whole image are matched, is proposed by Sun, et al. In mesh-DIC, the whole displacement field is characterized by a mesh which is constructed by 4-node… More >

  • Open Access

    ABSTRACT

    Calculating strains from noisy displacement fields by a finite element technique

    Guo Baoqiao, Chen Pengwan, Zhang Qingming, Li Yanjie, Xie Huimin
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 115-116, 2011, DOI:10.3970/icces.2011.017.115
    Abstract Optical full-field measurement methods are now widely applied in various domains. In general, the displacement fields can be directly obtained from the measurement; however in mechanical analysis strain fields are preferred. To extract strain fields from noisy displacement fields is always a challenging topic. In this study, a finite element method for smoothing displacement fields and calculating strain fields is proposed. An experimental test case on a holed aluminum specimen under tension is applied to validate this method. The heterogeneous displacement fields of the area around the hole are measured by the digital image correlation (DIC). By our proposed method,… More >

  • Open Access

    ABSTRACT

    A New Method of Camera Calibration for Large Field Videometrics

    Shang Yang, Sun Xiangyi, Yang Xia, Wang Xi, Yu Qifeng
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 117-118, 2011, DOI:10.3970/icces.2011.017.117
    Abstract A new method of camera calibration is presented for exact videometrics in large field. The camera to be calibrated and the control points used in the new method are both close to the ground. In the condition that the control points and the camera are approximately coplanar, the main point position, focus length, lens distortion coefficients and the camera's position and attitude parameters are calibrated precisely by the method. Two calibration images are taken by the camera to be calibrated in measurement state and vertical rotation state respectively. If the vertical tangent lens distortion can be neglected or the movement… More >

  • Open Access

    ABSTRACT

    Cell-substrate specific adhesion model regulated by substrate stiffness

    Jianyong Huang, Xiaoling Peng, Chunyang Xiong, Jing Fang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 119-120, 2011, DOI:10.3970/icces.2011.017.119
    Abstract Cell-substrate interfacial interplay plays a key role in many fundamental aspects of mammalian physiology. Recent progresses in related experiments concerning cell interactions with extracellular matrix have demonstrated that substrate rigidities can exert a remarkable influence on cell adhesion and spreading dynamics. For example, it has been reported that cell-substrate adhesion strength usually rises monotonically with Young's modulus of underlying elastic substrates and eventually achieves the strongest adhesion on rigid substrates such as glass, and that cell spreading area takes on a growing trend with the increase in substrate hardness and finally reaches a plateau when the stiffness exceeds the order… More >

  • Open Access

    ABSTRACT

    Geometrically Non-linear Analysis of Composite Laminated Plates Subjected to Low-Velocity Impact

    Xiuqin Zhang1, Simon Wang2*, Yingshun Zhang3
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 121-122, 2011, DOI:10.3970/icces.2011.017.121
    Abstract A B-spline finite strip model is developed in the context of a layer-wise plate theory for analysing the geometrically non-linear transient response of laminated composite plates subjected to transverse low-velocity impact. To simplify the complicated contact analysis, a Hertz-type contact law has been incorporated into the finite strip (FS) model for accounting for the contact behaviour. The model includes the geometrical non-linearity through use of von Karman's non-linear strain-displacement relationship. The resulting non-linear dynamic problem is solved using the Newmark time-stepping scheme together with Newton-Raphson iteration. Several numerical applications are described and a close comparison is found between the results… More >

  • Open Access

    ABSTRACT

    The localization / delocalization dilemma in the electronic structure of d- and f- element oxides

    Richard L.Martin
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 123-124, 2011, DOI:10.3970/icces.2011.017.123
    Abstract The electronic structure of many of the oxides containing d- and f-elements has long been a challenge for theory. For example, the traditional workhorses of density functional theory, the local density approximation (LDA) and the generalized gradient approximations (GGA), predict most of these systems to be metallic, when in fact they are insulators with band gaps of several eV. These problems reflect the localization/delocalization dilemma faced in systems with weak overlap and seem to be largely overcome by the new generation of hybrid density functionals developed for molecular studies. Only recently has it been possible to apply these functionals to… More >

  • Open Access

    ABSTRACT

    Quasi-static studies of deformation, fracture and mechanical properties of a PBX simulant using digital image correlation method

    Zhongbin Zhou, Pengwan Chen, Fenglei Huang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 125-126, 2011, DOI:10.3970/icces.2011.017.125
    Abstract The macroscopic deformation and fracture behavior of a polymer bonded explosive (PBX) simulation material were studied by using Digital Image Correlation (DIC) method. The Brazilian test, semi-circular bending test, punch loading and uniaxial loading experiments were chosen for the study. The whole displacement and strain fields were obtained by using DIC method at macro-scale. New sights into fracture processes and failure mechanisms of simulant samples under different quasi-static loading conditions have been obtained. Macro studies show that the experimental results are in agreement with the theoretical analysis. The experimental methods combined with DIC technique have broad applicability to deformation and… More >

  • Open Access

    ABSTRACT

    Dynamic Analysis and Aeroelastic Stability Analysis of Large Composite Wind Turbine Blades

    Wei LIU, Jiacong YIN, Pu CHEN, Xianyue SU
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 127-128, 2011, DOI:10.3970/icces.2011.017.127
    Abstract In this paper, parametric modeling technique is employed to fast build the three-dimensional finite element shell model of a preliminarily designed large composite wind turbine blade, which is subsequently used in the dynamic analysis and static elastic aeroelastic stability analysis of the blade. In the dynamic analysis, natural frequencies and corresponding modal shapes are obtained for the blade in the case of being still as well as being rotating with rated revolution. For the rotating blade, the stress stiffening effect and spin-softening effect due to the centrifugal forces are taken into account. The static elastic aeroelastic stability analysis, i.e. buckling… More >

  • Open Access

    ABSTRACT

    Effect of the curvature for the indented solid with curved surface using flat punch indentation

    Xiuqing Qian, Yanping Cao, Kunya Zhang, Zhicheng Liu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 129-130, 2011, DOI:10.3970/icces.2011.017.129
    Abstract Depth-sensing instrumented indentation tests are widely used to probe the mechanical properties of materials at a local area and small scales. Generally, indented solid was assumed semi-infinite plane solid because the contact region is small comparing the indented solid. However, for some biomaterial, such as skin, cornea and sclera, the effect of the curvature of the surface cannot be ignored. Using systematic finite element analysis and dimensional analysis, a method to determine the elastic modulus of the materials with curved surface is proposed using flat punch indentation in this paper.

    An axisymmetric, two-dimensional model was adopted and four-node bilinear… More >

  • Open Access

    ABSTRACT

    Size-dependent elastic properties of micro- and nano-open-celled foams

    Hanxing Zhu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.4, pp. 131-132, 2011, DOI:10.3970/icces.2011.017.131
    Abstract This paper aims to study the size-dependent elastic properties of micro- and nano-sized open-celled foams. To simplify the analysis, we use perfect regular body-centered cubic structure (i.e. BCC foam), which has cubic symmetry and only three independent elastic constants. Taking strut bending, twisting and axial compression/stretching as the deformation mechanisms, Zhu, Knott and Mills (JMPS, V45, pp. 319-343, 1997) have obtained closed form results of all the three independent elastic constants (i.e. the Young's modulus E11 , the shear modulus G12 and the Poisson ratio v12 ) as functions of the bending stiffness, the torsional stiffness and the compression/stretching stiffness… More >

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