Showing papers in "Finite Elements in Analysis and Design in 1995"

TL;DR: In this article, a finite element formulation is developed to model the response of laminated composite plates containing distributed piezoceramic actuators and senors and the stress equations of motion are derived usng the variational principle with respect to the total structural and electrical potential energy.

TL;DR: A brief review of multifield variational principles for the formulation of finite element methods in solid mechanics and an account of the evolution of hybrid/mixed finite element method are presented in this article.

TL;DR: In this article, the SPR procedure (Superconvergent Patch Recovery) was shown to yield superconvergence stress/gradient values throughout the domain when based on sample points with known superconversgent properties.

TL;DR: In this paper, a hybrid finite element method is presented for the mechanical analysis of heterogeneous materials with randomly dispersed inclusions, which is suitable even for extreme cases such as porous materials and materials with rigid inclusions.

TL;DR: In this article, a triangular finite element developed within the framework of a shear deformable plate theory is presented, which takes advantage of internal rotational degrees of freedom and a linked interpolation between the transverse displacement and the rotations.

TL;DR: In this article, a rational energy constraint is used as the optimization condition for hybrid finite elements and the optimal stress pattern of the element is established in a general formulation based on OPC.

TL;DR: In this article, a nonlinear finite element model for the flexure-shear response of reinforced concrete (RC) beams strengthened externally by epoxy bonded steel plates is presented.

TL;DR: In this article, the authors investigated the stress distribution and the variation of the mode I stress intensity factor along a straight three-dimensional (3D) crack by the finite element method and checked against plane strain theory near the mid-crack and against the 3D theory of Zhu at the free surface.

TL;DR: In this article, a mathematical programming method is obtained for the solution of elastoplastic contact problems with friction, based on the principle of virtual work and the finite element discretization.

TL;DR: Mesh quality improvement and the conversion from triangles to quadrilaterals has also been discussed, and Delaunay triangulation has been utilized within the mesh generator to connect the interior points.

TL;DR: The theoretical basis of a new explicit virtual-pulse time integral methodology for nonlinear dynamics problems is described, and the methodology is tested and compared with the implicit Newmark method through nonlinear softening and hardening spring dynamic models.

TL;DR: In this article, the concept and techniques from the field of Parametrized Variational Principles (PVPs) are extended to Matrix Structural Analysis (MSA), where free parameters are used as weighting factors of governing discrete equations.

TL;DR: A nonlinear material constitutive model, including a nonlinear in-plane shear formulation and a failure criterion, for fiber-composite laminate materials is employed to carry out finite element buckling analyses for composite plates under uniaxial compressive loads.

TL;DR: The capabilities that are provided by pre- and post-processors are reviewed and enhancements and new features that will likely be developed in the near future are suggested.

TL;DR: In this paper, structural matrices for straight Timoshenko beams with arbitrary shaped cross sections and in an arbitrarily oriented coordinate system are provided. But they do not consider the shear deflection in the two perpendicular planes of a Timoshenko beam and cannot be considered uncoupled for arbitrary cross sections.

TL;DR: In this article, the authors determined the stress intensity factors of an arbitrary located and oriented angled crack in discs using the finite element method and three different loading conditions were examined: boundary loadings resulting from disc attachments and/or interference fit with a rotating shaft, body forces resulting from rotation at a constant angular velocity and thermal stresses associated with a quadratic radial temperature distribution.

TL;DR: The objective is to present new ideas for the implementation of visualization and analysis environments with a software interface allowing the design and configuration of project-specific environments built around a core library that performs all the data extraction and manipulation.

TL;DR: In this paper, an elastic-plastic analysis of anisotropic work-hardening materials based on a quadratic approximation of the Tsai-Wu criterion is presented.

TL;DR: In this paper, an 8-node solid finite element capable of undergoing both large displacements and large rotations was developed on a sound variational basis and the operator split method was employed in solving the equilibrium equations which resulted in minimal secondary storage requirements.

TL;DR: An automatic two-dimensional mesh generation scheme based on superelement decomposition technique is presented and application to plane adaptive FEA problems demonstrates that the proposed mesh generator (MSD) results in good mesh grading and convergence characteristics.

TL;DR: In this paper, a parametric infinite element, in which the parametric axis extends to infinity, is presented, and the performance of the proposed infinite element is assessed by solving one-dimensional differential equations, the classical Boussinesq problem, and a case of uniform pressure acting on an elastic medium of infinite lateral extent.

TL;DR: In this paper, a nonlinear finite element composite arch model with through-the-thickness shear is proposed to capture large cross-sectional rotation incorporating a geometrically non-linear finite-element composite ark model.

TL;DR: In this paper, assumed stress hybrid elements are presented for geometrically as well as materially nonlinear problems with or without volume constraints, where variational principles using unsymmetric stresses and rotations are adopted as the basis of the formulations.

TL;DR: A finite element visualization facility, FEView, which has been implemented based upon an object-oriented graphics library and has been equipped with geometry operation functionality, in which a particular part of an object can be obtained by specifying material indices, element numbers, and cutting boxes.

TL;DR: In this article, the authors extended the formulation of a 3-node beam finite element with layerwise constant shear (BLCS) to the analysis of plane frames with rectangular laminated sections and flexible joints.

TL;DR: In this paper, a multilayer hybrid-stress finite element model together with two types of composite multi-layer elements (MLTUP and MLTPH) is employed to evaluate the influence of various patch parameters (position, length, thickness and fiber orientation) on the estimation of stress intensity factors in partially patched cracked composite laminates.

TL;DR: In this article, the problem of grasping rigid and deformable objects in a task-level animation system is addressed, and a numerical method based on finite element theory is used to take into account the active forces of the fingers on the object and the reactive forces of an object on the fingers.

TL;DR: In this article, the elastic properties of two dissimilar materials containing a single and two interacting inhomogeneities near the interface using a novel finite element were derived explicitly in a series form using the complex potentials of Muskhelishvili.

TL;DR: In this article, a variational inequalities approach is used to solve the general frictional contact problem. But the proposed method avoids user defined penalty parameters in step I and guarantees the imposition of the contact constraints in step II thus leading to improved accuracy.