Showing papers in "Computers & Structures in 1987"

TL;DR: In this paper, a displacement-pressure (up) finite element formulation for the geometrically and materially nonlinear analysis of compressible and almost incompressible solids is proposed.

TL;DR: In this article, the authors reviewed the use of strain-softening models both theoretically and numerically and demonstrated that the most serious consequence of strain softening is that it may cause snap-back behavior on a structural level.

TL;DR: In this article, a finite-element computational procedure is developed for the first-ply failure analysis of laminated composite plates based on first-order shear deformation theory and a tensor polynomial failure criterion that contains the maximum stress, maximum strain, the Hill, Tsai-Wu and Hoffman failure criteria.

TL;DR: PANDA2 as discussed by the authors finds minimum weight designs of laminated composite flat or curved cylindrical panels with stiffeners in one or two orthogonal directions, which can be loaded by as many as five combinations of in-plane loads and normal pressure.

TL;DR: In this article, a new general formulation for all arc length procedures is given based on orthogonality principles, which provides a new perspective illustrating the relationship between the existing and proposed path following techniques.

TL;DR: In this article, the concept of Pareto-optimal solution is discussed in the context of a multiobjective structural optimization problem and the commonly used methods of generating paretooptimal solutions are indicated.

TL;DR: In this paper, the updated Lagrangian Jaumann formulation is used for the analysis of an elastic closed strain path involving stretching and shearing, and the analytical stress solution for each phase of the strain path is given and the final stresses at zero strain are calculated.

TL;DR: In this article, a hybrid stress model based on the modified complementary energy principle and taking into account the transverse shear deformation effects is developed for the analysis of laminated composite plates.

TL;DR: In this article, a new interaction algorithm for treating three-dimensional impactpenetration simulations with erosion is presented, based on interactions between slave nodes (projectile) and master elements (target) and no tracking of the sliding interfaces is needed.

TL;DR: In this paper, a local finite element model based on a refined approximate theory for thick anisotropic laminated plates is presented, and the static bending stresses, transverse shearing stresses and in-plane displacements are predicted.

TL;DR: In this paper, the von Mises criterion for small strain analysis is used for plane stress with mixed hardening, and the elastic predictor-radial return algorithm and a consistent tangent operator satisfy the requirements for a stable and accurate numerical procedure.

TL;DR: In this article, finite element analysis and correlation with experiment of the displacement time histories of a square steel plate exposed to normal spatially constant air blast shock waves is presented for a stiffened panel subjected to a shock wave from a surface explosion at the Defense Nuclear Agency's event code named MINOR SCALE.

TL;DR: In this article, a generalized finite element analysis scheme is developed to handle the steady and transient response of moving/rolling nonlinear viscoelastic structure, including the effects of large deformation kinematics and visco-elasticity modeled by fractional integrodifferential operators.

TL;DR: A review and comparison of the existing arc-length algorithms for the automatic incremental solution of nonlinear finite element equations in static analysis are presented in this paper, where a set of benchmark problems are tested for comparison purposes.

TL;DR: In this article, a strong patch test is used to establish a general formulation to generate incompatible element functions, and a consistency condition for the incompatible elements is suggested, and then various convergence criteria are obtained naturally.

TL;DR: In this article, an accurate and reliable finite element with four nodes and five degrees of freedom at each node, the in-plane displacements u and v, the transverse displacement w, and section rotations θx and θy were presented.

TL;DR: In this paper, a single degree-of-freedom clastodynamic analysis of the response of a rectangular plate subjected to an explosive blast has been conducted assuming a Navier form of displacement function and a modified Friedlander reflected blast overpressure loading which exponentially decays with time.

TL;DR: In this article, a refined transverse vibration and buckling analysis based on the same local model is presented, and numerical examples are compared with analytical solutions and classical plate theory and it is demonstrated that the present model predicts a realistic laminate global response.

TL;DR: In this article, a very simple and practical formulation and procedure to remove the restriction of small rotations between two successive increments for geometrically nonlinear analysis of shells using flat triangular shell elements is presented.

TL;DR: In this paper, a co-rotational formulation combined with small deflection beam theory with the inclusion of the effect of axial force is adopted to distinguish between rigid body and deformational rotations.

TL;DR: In this paper, a quadrilateral shell element consisting of five nodes, four corner nodes and a central node is developed for linear elastic analysis of thin as well as moderately thick shells.

TL;DR: In this article, an algorithm is described which properly handles integration of stress-strain laws at singular points in a yield surface, and conditions for which the stress, after correction for plastic flow, exactly satisfies the yield function are discussed.

TL;DR: In this paper, a theory based on minimum potential energy for the bifurcation buckling of elastic or elastic-plastic isotropic or elastic composite, flat or cylindrical, ring-stiffened panels subjected to combined in-plane loads is derived.

TL;DR: In this article, an approximate semianalytical method for determination of interlaminar shear stress distribution through the thickness of an arbitrarily laminated thick plate has been presented, based on the assumptions of transverse inextensibility and layerwise constant shear angle theory.

TL;DR: In this paper, an efficient and accurate 3D finite element model which may be used in the nonlinear analysis of reinforced concerete plate and shell structures is presented. But the model is not suitable for the non-linear analysis in the case of finite element models.

TL;DR: In this paper, the authors proposed the degenerated shell elements with assumed transverse shear and membrane strains, which were used to overcome the shear locking problem in shell elements.

TL;DR: In this article, a finite element analysis tool for modeling the thermoforming and blow molding of 2D and axisymmetric shapes is described, where the hot polymer is modeled as a nonlinear elastic, incompressible, membrane.

TL;DR: In this article, an eigenvalue reduction technique was used to reduce the order of the system, in conjunction with dynamic programming, to estimate the forcing function, and several numerical experiments were performed to ascertain the effects of noise, the weighting parameters and the reduction of modes on the solution.

TL;DR: In this paper, an analytical procedure for the analysis of framed structures considering the flexibility of steel beam-to-column connections is presented, followed by a presentation of several numerical examples to enumerate the behavior of these frames.

TL;DR: In this article, a six-noded quadratic isoparametric element is used to represent the stress-strain relations in a curved adhesive-bonded joint.