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A new C0 2D FE model based on improved higher order zigzag theory for the analysis of soft core sandwich plate

Khandelwal R. P., Chakrabarti A., Bhargava P.

International Journal of Applied Mechanics and Engineering

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2013

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Vol. 18, no. 2

395--423

EN

An efficient C0 continuous finite element (FE) model is developed based on a combined theory (refine higher order shear deformation theory (RHSDT) and least square error (LSE) method) for the static analysis of a soft core sandwich plate. In this (RHSDT) theory, the in-plane displacement field for the face sheets and the core is obtained by superposing a global cubically varying displacement field on a zig-zag linearly varying displacement field with a different slope in each layer. The transverse displacement assumes to have a quadratic variation within the core and it remains constant in the faces beyond the core. The proposed model satisfies the condition of transverse shear stress continuity at the layer interfaces and the zero transverse shear stress condition at the top and bottom of the sandwich plate. The nodal field variables are chosen in an efficient manner to circumvent the problem of C1 continuity requirement of the transverse displacements. In order to calculate the accurate through thickness transverse stresses variation, the Least Square Error (LSE) method has been used at the post processing stage. The proposed combined model (RHSDT and LSE) is implemented to analyze the laminated composites and sandwich plates. Many new results are also presented which should be useful for future research.

2

Behavior of eccentrically loaded rcc columns confined with frp sheets

Chakrabarti A., Bhargava P.

International Journal of Applied Mechanics and Engineering

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2011

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Vol. 16, no 4

943-958

EN

A nonlinear finite element model is developed for the analysis of an RCC (reinforced concrete column) confined by FRP (fiber - reinforced polymers) sheets and subjected to eccentric loading. A practical design of FRP confined concrete columns requires an accurate estimate of the performance enhancement due to the confinement mechanism under eccentric loading. Therefore, a confinement model is developed which relates the confined concrete strength with the unconfined concrete strength. In the present study, a 3-D finite element model is developed using the finite element software, ANSYS for the analysis of an FRP confined reinforced concrete circular column under axial and eccentric loading. The effects of four important parameters are studied in the present work: namely, the unconfined concrete strength, FRP thickness with different layer orientation, orthotropic properties of FRP and orientation of FRP fibers. The study focused on some interesting effects of these parameters on the confinement effectiveness of eccentrically loaded reinforced concrete columns. Many new results are generated which should be useful for future references.

3

Finite element solution of mixed convection micropolar fluid flow between two vertical plates with varying temperature

Kumar L., Bhargava R., Bhargava P., Takhar H. S.

Archives of Mechanics

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2005

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Vol. 57, nr 4

251--264

EN

This paper presents a finite element solution for the mixed convection micropolar fluid flow between two parallel plates with varying temperature. The governing differential equations are solved numerically using the finite element method. The effect of important parameters, namely pressure gradient, micropolar parameter and surface, condition parameter on velocity, microrotation as well as on temperature functions has been studied. It is noticed that the micropolar fluids act as a cooling agent as well as a drag reducing fluids.