Showing papers in "Computers & Structures in 1989"

TL;DR: Numerical solution methods surveyed here will be of much use to practicing computational/finite element/structural engineers working in the area of dynamics of structures.

TL;DR: In this article, the dynamic response of a composite laminate plate to transverse impact loading is simulated numerically and an FEM scheme based on an eight-point brick element and three dimensional linear elasticity theory is employed, assuming that the laminate layers are homogeneous and orthotropic.

TL;DR: In this article, a buckling analysis of composite laminates for critical temperatures under thermal loads is reported, which is based on linear theory and the finite element method using semiloof elements.

TL;DR: Two plate bending elements that have been proposed and mathematically analyzed previously by Bathe, Brezzi and Fortin are presented: the MITC7 (a triangular) element and theMITC9 (a quadrilateral) element.

TL;DR: In this article, a cohesive crack model is proposed to describe the size effects of fracture mechanics, i.e. the transition from ductile to brittle structure behaviour, by increasing the size scale and keeping the geometric shape unchanged.

TL;DR: In this article, a return mapping method of integrating constitutive equations that has already been tested in various elastoplastic and viscoplastic material models is applied to certain friction problems.

TL;DR: In this paper, the free vibration characteristics of laminated composite shells are presented using an isoparametric doubly curved quadrilateral shear flexible element and first-order shear deformation theory is accounted for using an extension of Sanders' shell theory.

TL;DR: In this paper, a large displacements/small strains finite element formulation is used to trace the nonlinear load-displacement curve, and to obtain the maximum internal forces that occur in the members of the structure during deployment.

TL;DR: In this article, a refined higher-order theory for free vibration analysis of unsymmetricaliy laminated multilayered plates is presented, which accounts for parabolic distribution of the transverse shear strains through the thickness of the plate and rotary inertia effects.

TL;DR: In this article, a robust and efficient numerical algorithm is presented, which solves the coupled modal equations by iteration, and it is shown that the numerical integration algorithm always converges for proportional damping and for loading that varies linearly within an arbitrary time interval.

TL;DR: In this article, the governing equations for the fully coupled theory of thermoelasticity are developed and a method for solving these equations, based on the finite element technique, is proposed.

TL;DR: In this article, the authors present a concise yet comprehensive method for the determination of natural frequencies of stiffened circular cylindrical shells based on the formulation of an energy functional which includes energy of bending in two planes and rotary inertia of the stiffeners.

TL;DR: In this paper, an explicit-explicit subcycling procedure for finite element analysis of structural dynamics is developed, which relaxes the usual constraint of requiring integer time step ratios for adjacent nodal groups, and thus improves the efficiency of the explicit time integrator.

TL;DR: In this article, an algorithm is proposed to generate quadrilateral elements over a triangular element mesh by selectively removing diagonals between triangles, where the quality of a triangle can be measured by the dimensionless α value (area/sum of squares of sides).

TL;DR: In this article, a computational model was developed by extensively modifying a commercially available thermal-elastic-plastic finite elements package, which is capable of predicting three-dimensional welding residual stresses through the thickness of a multi-pass weldment in the as-fabricated condition.

TL;DR: In this paper, the Dynamic Load Amplification Factor (DLF) of metal beams and plates subjected to axial in-plane impact compression loading was analyzed with the ADINA computer code.

TL;DR: In this article, the authors describe a continuum principle of design sensitivity analysis of linear and nonlinear structures for shape and nonshape optimization problems, which is more convenient to interpret and discretize for numerical calculations.

TL;DR: Primary emphasis is on the important algorithmic developments which have enhanced the numerical modelling of fracture processes and the need for theoretical advancements in continuum mechanics and constitutive fracture laws coupled with improved numerical algorithms is emphasized.

TL;DR: In this article, the reliability bounds of structural systems presented by Ditlevsen can be expressed by two-order joint probabilities, and the system reliability is fully and accurately expressed by one-order probabilities.

TL;DR: In this article, a modified adaptive dynamic relaxation (maDR) method is proposed which is more efficient than the former in solving non-linear problems, and is then applied to analyze the elastic-plastic bending of circular plates in large deflection and their following wrinkling, and leads to satisfactory results compared with corresponding experimental ones.

TL;DR: In this article, two-and three-dimensional nonlinear finite element analysis of concrete structures is presented, including the triaxial nonlinear stress-strain behavior, tensile cracking, tension-stiffening, compression crushing and strain-softening.

TL;DR: In this article, a simultaneous structural and control optimization of flexible structures is presented, where behavior constraints are imposed on the closed-loop eigenvalue distribution and the damping parameters.

TL;DR: In this article, a failure analysis of laminated composites is accomplished by using an iterative three-dimensional finite element method, based on Tsai-Wu failure theory.

TL;DR: In this paper, the analysis of frames is considered, in which a specially favorable structure of equations permits a solution of the equilibrium equations, since they are uncoupled from the remaining (strain-displacement and material) laws.

TL;DR: In this article, a finite element formulation for the non-symmetric bifurcation analysis of geometrically nonlinear elastic-plastic shells of revolution is presented.

TL;DR: In this article, the authors applied the finite element method to study the effect of moisture and temperature on the stability of a general orthotropic cylindrical composite shell panel subjected to axial or in-plane shear loading.

TL;DR: In this paper, a modified Monte Carlo Simulation is used to determine the reliability of rock slopes including possible correlations between the variables entering into the design equation, and a computer program has been developed to perform all the necessary calculations.

TL;DR: In this paper, a modification of the branch and bound approach in linear integer programming is proposed to include nonlinear optimization problems involving continuous, integer, and discrete design variables, which is based on a piecewise linear representation of the nonlinear problem.

TL;DR: A valuable approach for the automatic generation of effective finite element meshes is presented, which comprises an initial mesh construction and an h-version of adaptive refinement based on an error analysis.

TL;DR: In this article, the authors propose a contact searching algorithm based on general considerations of the contact phenomena between contacting bodies or within one self-contacting body, where the contact body is decomposed into contact hierarchies.