G.M. Kulikov¹, E. Carrera², S.V. Plotnikova¹, S. Brischetto²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 187-192, 2008, DOI:10.3970/icces.2008.005.187

Abstract This paper presents the geometrically exact assumed stress-strain four-node element with nine displacement degrees of freedom per node. The finite element formulation developed is based on the 9-parameter shell model by employing a new concept of interpolation surfaces (I-surfaces) inside the shell body. We introduce three I-surfaces and choose nine displacements of these surfaces as fundamental shell unknowns. Such choice allows us to represent the higher-order shell formulation in a very compact form and to derive in curvilinear reference surface coordinates the strain-displacement relationships, which are objective, i.e. invariant under all rigid-body motions. More >

K. G. Wang¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 179-186, 2008, DOI:10.3970/icces.2008.005.179

Abstract Microstructural modeling is very important because it can provide a critical link between properties, mesoscopic length scale, and atomistic scale (multiscale modeling). There exist a couple of models and simulations to study microstructural evolution. It will be important and useful to discover unified model equations hidden in microstructure evolution. In this paper, I will derive the unified model equations for microstructure evolution. The governing equations in Lifshitz-Slyozov-Wagner theory and diffusion screening theory that modeled microstructural evolution are derived with some approximations from the unified model equations. The governing equations in multiparticle diffusion simulation and phase-field simulation in microstructure evolution are… More >

A.A.Bayramov¹, N.A.Safarov²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 173-178, 2008, DOI:10.3970/icces.2008.005.173

Abstract In paper the automatic photoelectric device (APD) for most optimum illumination of streets and objects is described. The offered photovoltaic system is mean for automatic switching on and switching off to an electric circuit of electric systems and illuminating lamps. This system differs from existing ones that the silicon solar cell is used for the purpose increase of input sensitivity and an output power, and so the circuit of our system is simpler. One of main technical advantages is that the relay for a current of 10A is used on an output of the automatic control system. This advantage allows… More >

L.C.G. DeSouza¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 163-172, 2008, DOI:10.3970/icces.2008.005.163

Abstract Satellite Attitude Control System usually does not have all the states available for feedback; therefore, full state estimation by any sort of filtering methodology becomes essential. A good estimation algorithm must filter out the undesirable noise from the measurement signal. Kalman Filter (KF) technique is a traditional procedure to estimate the states of a linear system that are not always measured directly by the sensors, minimizing the variance of the estimated error. However, the KF is not fully robustness proven in face of unpredictable noise sources and it is not always able to minimize the error under severe conditions. In… More >

Alireza Fereidooni¹, Kamran Behdinan¹, Zouheir Fawaz¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 157-162, 2008, DOI:10.3970/icces.2008.005.157

Abstract In this paper, dynamics instability of laminated composite beams subjected to axial and harmonically varying time loads are studied. The equations of motion are derived in integral form using the principle of virtual work and the first order shear deformation theory. A five node twenty-two degrees of freedom beam element has been developed to discretize these equations. The regions of dynamic instability of the beam are determined by solving the obtained Mathieu form differential equations. The effects of non-conservative loads and shear stiffness parameters on dynamic instability of the beam are studied. More >

FU Zhiliang¹, GUO Hua², GAO Yanfa³

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 145-156, 2008, DOI:10.3970/icces.2008.005.145

Abstract This paper is focused on the micro-damage evolution properties of gray green mudstone under impacting disturbance load conditions for the first time by using the real time CT testing technique. CT images and CT values for rock cross-sections under different impacting disturbance loading levels were obtained. The paper is also to describe process of rock creep damage under disturbance loads and to explore the mechanism of micro-damage. The results have shown that rock failure is easy to happen suddenly rock is in or close to limit strength neighborhood during the process of disturbance. This will further lay the theory basis… More >

I. Chudinovich¹, C. Constanda¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.3, pp. 137-144, 2008, DOI:10.3970/icces.2008.005.137

Abstract An initial-boundary value problem for bending of a piecewise homogeneous thermoelastic plate with transverse shear deformation [1] is considered. The unique solvability in distributional spaces is proved by means of a combination of the Laplace transformation and variational methods. This is the first, and essential, step in the construction of boundary element methods for numerical approximations of the solution. The model without thermal effects has been studied in [2]--[6]. More >

Roberta Apostolska¹, Golubka Necevska-Cvetanovska²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.2, pp. 129-136, 2008, DOI:10.3970/icces.2008.005.129

Abstract The IZIIS' contribution to development of high quality materials has been seen in realization of several scientific-research projects in the field of high strength concrete in the period from 1992 to 2006. Within the frames of these projects complex laboratory-experimental-analytical investigations have been performed to contribute to definition of the methodology for obtaining high stength concrete exclusively from domestic resources, to investigate joint behaviour of high strength materials and elements in nonlinear range as well as to define dynamic behaviour high strength concrete buildings exposed to seismic actions. The selected results from these investigations are presented in the paper. More >

U.Suryanarayana Murty¹, V.Sreehari Rao²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.2, pp. 121-128, 2008, DOI:10.3970/icces.2008.005.121

Abstract Artificial intelligence has opened a new window of opportunity and has definitely a long way to look ahead in\nobreakspace {}area of data analysis. The enormity of magnitude of data and its complex nature often perplex the epidemiologists. This is especially true in case of vector borne diseases where a timely and precise understanding of disease during decision making process comes handy for curbing the diseases in event of an outbreak or epidemic. Often the public health officials feel the need of correct identification of true positive cases. A tool that classify disease according to presence or absence of a disease… More >

K. Y. Liu^1,2, S. Y. Long^1,2,3, G. Y. Li¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.2, pp. 99-120, 2008, DOI:10.3970/icces.2008.005.099

Abstract A meshless local Petrov-Galerkin method (MLPG)^[1] for the analysis of cracks in isotropic functionally graded materials is presented. The meshless method uses the moving least squares (MLS) to approximate the field unknowns. The shape function has not the Kronecker Delta properties for the trial-function-interpolation, and a direct interpolation method is adopted to impose essential boundary conditions. The MLPG method does not involve any domain and singular integrals to generate the global effective stiffness matrix if body force is ignored; it only involves a regular boundary integral. The material properties are smooth functions of spatial coordinates and two interaction integrals^[2,3] are… More >