Showing papers in "Finite Elements in Analysis and Design in 2012"

TL;DR: In this article, the bending and the free flexural vibration behavior of sandwich functionally graded material (FGM) plates are investigated using QUAD-8 shear flexible element developed based on higher order structural theory.

TL;DR: In this paper, an isogeometric finite element method is presented for natural frequencies analysis of thin plate problems of various geometries, and the non-uniform rational B-splines (NURBS) basis function is applied for approximation of the thin plate deflection field, as for description of the geometry.

TL;DR: In this paper, a finite element reduced-order model for the nonlinear vibrations of piezoelectric layered beams with application to NEMS is presented, where the geometrical nonlinearities are taken into account through a von Karman nonlinear strain-displacement relationship.

TL;DR: An implicit fully discrete local discontinuous Galerkin (LDG) finite element method for solving the time-fractional Schrodinger equation, where the fractional derivative is described in the Caputo sense.

TL;DR: In this paper, finite element formulations for nonlocal elastic Euler-Bernoulli beam theory and Timoshenko beam theory have been reported, and bending, buckling and vibration analyses are extended to tapered beams.

TL;DR: It is demonstrated that stochastic analyses can be performed on large and complex models within affordable costs and the applicability of the proposed tools for practical applications is demonstrated.

TL;DR: In this paper, the effect of density grading, number of grading layers, and thickness of the interactive layer upon the resulting specific energy absorption was investigated, and the results showed relative improvement of 12% in energy absorption levels of density-graded foam-filled structures over their uniform density counterparts with the same mass.

TL;DR: In this paper, a dynamic model for cable-driven parallel manipulators with cables of slowly time-varying length is presented, and two numerical examples are demonstrated to validate the dynamic model, and also show that it is necessary to take into consideration the cable dynamics for manipulators of long-span cables.

TL;DR: This paper presents a practical approach based on high dimensional model representation (HDMR) for analyzing the response of structures with fuzzy parameters, and involves integrated finite element modeling, HDMR based response surface generation, and both, implicit and explicit fuzzy analysis procedures.

TL;DR: In this article, a tested shear critical reinforced concrete beam without shear reinforcement was analyzed using an incremental-iterative solution procedure to simulate the brittle failure behavior of the beam properly.

TL;DR: A variable fidelity algorithm which integrates the one step solver with incremental solver for optimizing sheet metal forming process and adopts the artificial bee colony (ABC) algorithm to obtain the global optimum is presented.

TL;DR: An improved C"0 two dimensional finite element model based on higher order zigzag plate theory (HOZT) is developed and applied to the analysis of laminated composite and sandwich plates under different situations to study the performance of the model as discussed by the authors.

TL;DR: The aim of this work is to develop a new design approach based on numerical shape optimization with the idea of significantly reducing the number of running-in experiments in extrusion die scenarios.

TL;DR: In this article, the shape sensitivities of the von Mises stress function are evaluated on a nonuniform mesh and mapped isoparametrically to a uniform Cartesian grid on which the Hamilton-Jacobi equation is solved.

TL;DR: In this paper, a new quadrilateral four node membrane finite element based on a mixed Hellinger-Reissner variational formulation is proposed, where displacement and stress interpolations are defined by 12 kinematical DOFs (two displacements and one drilling rotation per node) and 9 stress parameters.

TL;DR: In this paper, the authors developed a theoretical model to evaluate the static load capacity of four contact point slewing bearings and formulated an acceptance surface in the load space, in such a way that the validity of a load combination is assured by an inside-surface checking.

TL;DR: In this article, a finite element (FE) model was used to model the phase transformations encountered by steels when submitted to rapid heating and cooling and the effects of the Peclet number and heat transfer coefficient on phase transformations and residual stresses have been analyzed.

TL;DR: In this paper, the Newmark time stepping methods and finite rotations for nonlinear finite element analysis of flexible beam structures are compared. And the numerical results show that these four formulations have the same numerical accuracy, but that the computational efficiency depends on the choice of the tangent inertia matrix.

TL;DR: In this paper, the use of AC magnetic fields with fixed and variable frequencies in different waveforms is investigated at both low and high speeds, and the frequency of the applied field is optimized using genetic algorithms on a generic ECB configuration.

TL;DR: The results demonstrated that the VCCT implementation in Marc(TM) was capable of accurately replicating the benchmark delamination growth results and illustrated key similarities and differences between two commercial FE codes implementing the same analysis technique, which reinforces the need for rigorous benchmarking and assessment.

TL;DR: In this paper, a phenomenological finite strain viscoelastic constitutive model was developed within the framework of irreversible thermodynamics with internal variables based on the multiplicative decomposition of the deformation gradient into elastic and visco-elastic parts, together with the use of the isotropic property of the Helmholtz strain energy function.

TL;DR: In this paper, a compliant multistep actuator with an integrated electrostatic comb drive transducer is presented, which exhibits controllable sequential snap-through buckling under an increasing actuation force.

TL;DR: In this article, the optimization of TMD systems to suppress multi-resonant dynamic structural response of high-speed railway bridges is studied, where the objective function is chosen based on the H"2 norm along with the constraints on all the peaks which are at the same heights over the frequency ranges of interest.

TL;DR: In this article, the authors presented an application of B-spline wavelet on interval (BSWI) finite element for one-dimensional elastic wave propagation problems using central difference method in time domain, numerical results involving wave propagation in rod and beam are obtained and compared with results calculated by classical finite element method.

TL;DR: In this paper, the authors show that the magnetic force generated by a linear actuator may be enhanced through the optimization and design of the devices air-gap magnetic field distribution, and a periodic ladder structure is proposed for magnetic field manipulation.

TL;DR: In this paper, a shape modification concept is used to change the vibrational and acoustical properties of the finite element model, which can give a suitable performance for using it in structural acoustic optimization applications.

TL;DR: In this paper, a finite element method is presented to simulate the break-up of ice accreted on the wings of aircraft, which is integrated in FENSAP-ICE, a simulation code that solves flow, droplet impingement and ice accretion, in sequence.

TL;DR: The structural behavior analysis, which was performed using a special type of the user defined finite element incorporated within commercial finite element software, confirmed a successful implementation of the developed user element subroutine.

TL;DR: In this paper, a finite element model has been developed for analyzing the dynamic response of sandwich plates with partially damaged facesheet-to-core interface, where the effect of intermittent dynamic contact between the fragments detached at the damaged interface is taken into account for simulation of sandwich plate' vibrations.

TL;DR: In this article, the effect of rotational speeds on free vibration characteristics of delaminated twisted graphite-epoxy cross-ply composite conical shells employing finite element method is presented.