• Buckling of double-Walled carbon nanotubesBuckling of double-Walled carbon nanotubes

    In this study it has been demonstrated that the finite difference method can be successfully applied to buckling of double-walled carbon nanotubes since it yields extremely reliable results. The best approximation for the clamped-free DWCNT is 5.590 (Tab. 1), and the best approximation for the simply supported at both ends is 22.236 (Tab. 2). T...

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  • An effective algorithm for reliability-Based optimization of stiffened mindlin plateAn effective algorithm for reliability-Based optimization of stiffened mindlin plate

    The paper presents an approach to establish and solve two reliability-based design optimization problems for Mindlin plate stiffened by Timoshenko beams. In the first problem, static analysis is considered. The objective function is the minimum of the strain energy with constraints on displacement. In the second problem, free vibration analysis i...

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  • Numerical analysis of free vibration of cross-Ply thick laminated composite cylindrical shells by continuous element methodNumerical analysis of free vibration of cross-Ply thick laminated composite cylindrical shells by continuous element method

    This article has succeeded in constructing the CEM model and in creating a computing program by Matlab to solve the problem of vibration of thick composite cylindrical shells using Continuous Element Method. Through different comparisons with the published results and with the other calculation methods, the obtained results are very satisfied. N...

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  • A co-Rotational beam element for geometrically nonlinear analysis of plane framesA co-Rotational beam element for geometrically nonlinear analysis of plane frames

    In this paper, a co-rotational beam element for geometrically nonlinear analysis of plane frames has been formulated. The shallow arch expression was adopted for the local strain and the exact polynomials obtained from the field consistence approach were employed as interpolation functions for the transversal displacement and sectional rotation....

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  • Postbuckling of functionally graded cylindrical shells based on improved donnell equationsPostbuckling of functionally graded cylindrical shells based on improved donnell equations

    This paper presents an analytical approach to investigate buckling and postbuckling behaviors of FGM circular cylindrical shells subjected to axial compressive load, uniform external pressure accounting for the effects of temperature conditions. Equilibrium equations are established within the framework of improved Donnell shell theory taking int...

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  • A method of skin frictional resistant reduction by creating small bubbles at bottom of shipsA method of skin frictional resistant reduction by creating small bubbles at bottom of ships

    Small bubble injection method has an effect on reduction ship resistance, and therefore, the ship energy consumption is reduction, correlatively. In calm water, the small bubble injection method has a good effect on a ship at an interval identified operating speed. In this research, experiments were carried out with a 20000 ton model ship, then,...

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  • Generalized pseudo inverse kinematics at singularities for developing five-Axes cnc machine tool postprocessorGeneralized pseudo inverse kinematics at singularities for developing five-Axes cnc machine tool postprocessor

    The paper presents an analytical scheme for analyzing the singular configuration of general five-axes CNC machine This is useful for checking the singularities of any specific machine. The singular configuration problem causing big machining error is effectively solved and the proposed algorithm shows its advantage for producing smooth cutter tr...

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  • Nonlinear buckling and post-Buckling of eccentrically stiffened functionally graded cylindrical shells surrounded by an elastic medium based on the first order shear deformation theoryNonlinear buckling and post-Buckling of eccentrically stiffened functionally graded cylindrical shells surrounded by an elastic medium based on the first order shear deformation theory

    This paper presents an analytical solution to investigate the buckling and postbuckling behavior of ES-FGM cylindrical shells surrounded by an elastic medium subjected to mechanical compressive loads and external pressures. Theoretical formulations are based on the smeared stiffeners technique and the first-order shear deformation theory. The an...

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  • Construction of bounds on the effective shear modulus of isotropic multicomponent materialsConstruction of bounds on the effective shear modulus of isotropic multicomponent materials

    The trial polarization fields (6), (29) used in this paper depend on 2N − 2 free parameters [i.e., 2N parameter aα, bα restricted by 2 constraints (10), (11)], hence are more general than the Hashin-Shtrikman ones used [3–5], which contain just 2 free parameters. Therefore the new bounds are more restricting in the cases N ≥ 3. We remind the part...

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  • Multiple crack identification in stepped beam by measurements of natural frequenciesMultiple crack identification in stepped beam by measurements of natural frequencies

    In the present study the well known Rayleigh Quotient has been developed for multi-stepped beam with arbitrary number of cracks and boundary conditions. This is an explicit expression of natural frequencies in term of crack parameters that provides a simplified method for calculating natural frequencies of the beam. Moreover, the Rayleigh Quoti...

    pdf16 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 587 | Lượt tải: 0