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T Kant - One of the best experts on this subject based on the ideXlab platform.

  • Transient dynamic analysis of higher order sandwich and composite arches
    Composite Structures, 2011
    Co-Authors: Sudhakar R. Marur, T Kant
    Abstract:

    A higher order refined model with isoparametric elements is proposed to study the transient dynamic response of laminated arches/curved beams. The strain field is modeled through cubic axial, cubic transverse shear and linear transverse normal strain components. As the cross-Sectional Warping is accurately modeled by this theory, the shear correction factor is rendered redundant. The stress–strain relationship is derived from an orthotropic lamina in a three-dimensional state of stress, so that angle-ply laminates can be studied through one-dimensional elements. Consistent mass matrix is constituted for the equation of motion, which is solved by Newmark integration scheme. The higher order formulation is validated with available results and subsequently applied to arches with various curvatures, aspect ratios, boundary conditions, loadings and lamination schemes to evaluate its transient dynamic performance and suitable conclusions are drawn.

  • On the flexural analysis of sandwich and composite arches through an isoparametric higher-order model
    Journal of Engineering Mechanics-asce, 2009
    Co-Authors: Sudhakar R. Marur, T Kant
    Abstract:

    A higher-order arch model with seven degrees of freedom per node is proposed to study the deep, shallow, thick, and thin composite and sandwich arches under static loads. The strain field is modeled through cubic axial, cubic transverse shear, and linear transverse normal strain components. As the cross-Sectional Warping is accurately modeled by this theory, it does not require any shear correction factor. The stress-strain relationship is derived from an orthotropic lamina in a three-dimensional state of stress. The proposed formulation is validated through models with various curvatures, aspect ratios, boundary conditions, materials, and loading conditions.

  • Free vibration of higher-order sandwich and composite arches, Part I: Formulation
    Journal of Sound and Vibration, 2008
    Co-Authors: Sudhakar R. Marur, T Kant
    Abstract:

    A higher-order refined model with seven degrees of freedom per node is presented in this paper for the free vibration analysis of composite and sandwich arches. The strain field is modeled through cubic axial, cubic transverse shear and linear transverse normal strain components. As the cross-Sectional Warping is accurately modeled by this theory, it does not require any shear correction factor. The stress-strain relationship is derived from an orthotropic lamina in a three-dimensional state of stress. The proposed higher-order formulation is validated, in this first part, through arches with various curvatures, aspect ratios, boundary conditions and materials.

  • On the performance of higher order theories for transient dynamic analysis of sandwich and composite beams
    Computers & Structures, 1997
    Co-Authors: Sudhakar R. Marur, T Kant
    Abstract:

    Higher-order shear-deformable refined theories, based on isoparametric elements, are adopted for transient dynamic analysis of symmetric and unsymmetric sandwich and composite beam constructions. These shear-correction coefficient free theories model cross Sectional Warping using nonlinear variation of inplane displacements across the depth. They also incorporate transverse shear stress in the formulation. A special lumping scheme is employed for the evaluation of diagonal mass matrix, and a central difference scheme is used for carrying out the integration of the equation of motion, to obtain the response history. Through numerical experiments, the efficacy of higher-order models in predicting displacements and stress, resultants over from the first-order theory, with respect to time, is clearly brought out in this paper.

  • effect of cross Sectional Warping of anisotropic sandwich laminates due to dynamic loads using a refined theory and c finite elements
    International Journal for Numerical Methods in Engineering, 1992
    Co-Authors: T Kant
    Abstract:

    An attempt has been made to study the effect of cross-Sectional Warping in the symmetrically laminated anisotropic composite sandwich plates for transient loads. A higher-order shear deformation theory (HOST) is used in conjunction with the simple displacement based C° finite element method (FEM). As is well-known, the classical first-order theories hitherto considered were inadequate to describe the propagation of waves in the highly orthotropic sandwich laminates. The present theory, which is more accurate than the Reissner-Mindlin theory, is applied herein, for the evaluation of plate response to different types of dynamic loads. An explicit central difference scheme is employed for the integration of dynamic equations of equilibrium with a diagonalized mass matrix obtained by a special procedure applicable to quadrilateral isoparametric elements. The numerical results of the present investigation have been compared with the first-order shear deformation theory (FOST) and the differences between HOST and FOST are examined. The results presented here should be useful in obtaining better correlation between theory and experiment, and to numerical analysts in verifying their results.

Josef Eberhardsteiner - One of the best experts on this subject based on the ideXlab platform.

  • Structural design of Cross Laminated Timber (CLT) by advanced plate theories
    Composites Science and Technology, 2010
    Co-Authors: R. Stürzenbecher, Karin Hofstetter, Josef Eberhardsteiner
    Abstract:

    Cross Laminated Timber enjoys great popularity in structural engineering and is one of the upcoming building materials in the timber construction sector. To support the favorable development of this high-performance wood product and to strengthen its competitiveness towards other mass building materials, the mechanical behavior and its implications for the structural design are addressed here. From the mechanical point of view CLT is a multilayer, highly anisotropic and shear compliant laminated composite. Owing to the analytical solutions for laminated composites and sandwich plates, the actual deformation behavior of CLT will be presented, and the accuracy and computational efficiency of common and advanced plate theories will be demonstrated. Comprehending the effects of laminate lay-up, anisotropic material behavior and cross-Sectional Warping will lead to an enhanced understanding of its mechanical behavior and will contribute to trustworthy deformation and stress prognoses as well as to reliable structural design.

  • Structural design of Cross Laminated Timber (CLT) by advanced plate theories
    Composites Science and Technology, 2010
    Co-Authors: R. Stürzenbecher, Karin Hofstetter, Josef Eberhardsteiner
    Abstract:

    Cross Laminated Timber enjoys great popularity in structural engineering and is one of the upcoming building materials in the timber construction sector. To support the favorable development of this high-performance wood product and to strengthen its competitiveness towards other mass building materials, the mechanical behavior and its implications for the structural design are addressed here. From the mechanical point of view CLT is a multilayer, highly anisotropic and shear compliant laminated composite. Owing to the analytical solutions for laminated composites and sandwich plates, the actual deformation behavior of CLT will be presented, and the accuracy and computational efficiency of common and advanced plate theories will be demonstrated. Comprehending the effects of laminate lay-up, anisotropic material behavior and cross-Sectional Warping will lead to an enhanced understanding of its mechanical behavior and will contribute to trustworthy deformation and stress prognoses as well as to reliable structural design. © 2010 Elsevier Ltd.

R. Stürzenbecher - One of the best experts on this subject based on the ideXlab platform.

  • Structural design of Cross Laminated Timber (CLT) by advanced plate theories
    Composites Science and Technology, 2010
    Co-Authors: R. Stürzenbecher, Karin Hofstetter, Josef Eberhardsteiner
    Abstract:

    Cross Laminated Timber enjoys great popularity in structural engineering and is one of the upcoming building materials in the timber construction sector. To support the favorable development of this high-performance wood product and to strengthen its competitiveness towards other mass building materials, the mechanical behavior and its implications for the structural design are addressed here. From the mechanical point of view CLT is a multilayer, highly anisotropic and shear compliant laminated composite. Owing to the analytical solutions for laminated composites and sandwich plates, the actual deformation behavior of CLT will be presented, and the accuracy and computational efficiency of common and advanced plate theories will be demonstrated. Comprehending the effects of laminate lay-up, anisotropic material behavior and cross-Sectional Warping will lead to an enhanced understanding of its mechanical behavior and will contribute to trustworthy deformation and stress prognoses as well as to reliable structural design.

  • Structural design of Cross Laminated Timber (CLT) by advanced plate theories
    Composites Science and Technology, 2010
    Co-Authors: R. Stürzenbecher, Karin Hofstetter, Josef Eberhardsteiner
    Abstract:

    Cross Laminated Timber enjoys great popularity in structural engineering and is one of the upcoming building materials in the timber construction sector. To support the favorable development of this high-performance wood product and to strengthen its competitiveness towards other mass building materials, the mechanical behavior and its implications for the structural design are addressed here. From the mechanical point of view CLT is a multilayer, highly anisotropic and shear compliant laminated composite. Owing to the analytical solutions for laminated composites and sandwich plates, the actual deformation behavior of CLT will be presented, and the accuracy and computational efficiency of common and advanced plate theories will be demonstrated. Comprehending the effects of laminate lay-up, anisotropic material behavior and cross-Sectional Warping will lead to an enhanced understanding of its mechanical behavior and will contribute to trustworthy deformation and stress prognoses as well as to reliable structural design. © 2010 Elsevier Ltd.

Karin Hofstetter - One of the best experts on this subject based on the ideXlab platform.

  • Structural design of Cross Laminated Timber (CLT) by advanced plate theories
    Composites Science and Technology, 2010
    Co-Authors: R. Stürzenbecher, Karin Hofstetter, Josef Eberhardsteiner
    Abstract:

    Cross Laminated Timber enjoys great popularity in structural engineering and is one of the upcoming building materials in the timber construction sector. To support the favorable development of this high-performance wood product and to strengthen its competitiveness towards other mass building materials, the mechanical behavior and its implications for the structural design are addressed here. From the mechanical point of view CLT is a multilayer, highly anisotropic and shear compliant laminated composite. Owing to the analytical solutions for laminated composites and sandwich plates, the actual deformation behavior of CLT will be presented, and the accuracy and computational efficiency of common and advanced plate theories will be demonstrated. Comprehending the effects of laminate lay-up, anisotropic material behavior and cross-Sectional Warping will lead to an enhanced understanding of its mechanical behavior and will contribute to trustworthy deformation and stress prognoses as well as to reliable structural design.

  • Structural design of Cross Laminated Timber (CLT) by advanced plate theories
    Composites Science and Technology, 2010
    Co-Authors: R. Stürzenbecher, Karin Hofstetter, Josef Eberhardsteiner
    Abstract:

    Cross Laminated Timber enjoys great popularity in structural engineering and is one of the upcoming building materials in the timber construction sector. To support the favorable development of this high-performance wood product and to strengthen its competitiveness towards other mass building materials, the mechanical behavior and its implications for the structural design are addressed here. From the mechanical point of view CLT is a multilayer, highly anisotropic and shear compliant laminated composite. Owing to the analytical solutions for laminated composites and sandwich plates, the actual deformation behavior of CLT will be presented, and the accuracy and computational efficiency of common and advanced plate theories will be demonstrated. Comprehending the effects of laminate lay-up, anisotropic material behavior and cross-Sectional Warping will lead to an enhanced understanding of its mechanical behavior and will contribute to trustworthy deformation and stress prognoses as well as to reliable structural design. © 2010 Elsevier Ltd.

Donald W White - One of the best experts on this subject based on the ideXlab platform.

  • large displacement formulation of a three dimensional beam element with cross Sectional Warping
    Computers & Structures, 1992
    Co-Authors: Amit Dutta, Donald W White
    Abstract:

    Abstract A displacement-based three-node beam element is formulated for analysis of the large displacement/large rotation response of curved structural components of rectangular cross-section, including the effects of cross-Sectional Warping due to torsion. Master-slave relationships are derived which facilitate the modeling of eccentric stiffeners in plate and shell structures. Efficient and explicit relationships are developed for transformation between relative through-thickness displacement and global rotational degrees of freedom, between lamina and global coordinate systems, and between master and slave nodes as one composite operation. Simple functions are appended to the basic element displacements to account for cross-Sectional Warping deformations. The resulting formulation gives predictions which are close to the analytical response of an elastic beam subjected to torsion, yet the added computational expense is relatively small. Additional geometric stiffness terms associated with large rotation effects, which have been overlooked in many conventional formulations, are derived and elucidated. Examples are provided which demonstrate the significance of modeling cross-Sectional Warping and of incorporating the large rotation geometric stiffness terms in the analysis.