Showing papers in "Composite Structures in 1988"

TL;DR: In this paper, a higher-order plate theory and a technique based on the state space concept are used to investigate free vibration and buckling problems of rectangular cross-ply laminated plates.

TL;DR: In this paper, a higher-order theory which satisfies zero transverse shear stress conditions on the bounding planes of a generally laminated fiber-reinforced composite plate subjected to transverse loads is developed.

TL;DR: In this article, the optimal angle for laminate rectilinear rectangular plates under uniaxial or baoxial compression was investigated and obtained under buckling constraints.

TL;DR: In this paper, a simple theory for bending composite anisotropic plates that are laminated symmetrically about their midplane is presented, which incorporates transverse shear deformation and transverse normal stress as well as the higher-order effects.

TL;DR: In this article, a higher-order shear deformable C° continuous finite element is developed and employed to investigate the transient response of isotropic, orthotropic and layered anisotropic composite plates.

TL;DR: In this paper, the influence of geometrical parameters on the high velocity impact response of CFRP has been studied using a high pressure nitrogen gas gun and the resulting impact damage was assessed visually, by optical microscopy and by thermally deplying specimens in an oven.

TL;DR: In this article, a nonlinear method to analyze composite panels with elliptical delaminations under compressive loads is presented, based on solving the fully coupled partial differential equations for anisotropic elasticity using infinite series.

TL;DR: In this article, the dimensions of the double-tapered FRP leaf spring were investigated, and the optimal taper ratio was proved to be 0·5, and a new device for attachment of the longitudinal type double-tailed FRP spring to the vehicle was prepared.

TL;DR: In this paper, the fracture toughness and fracture surface energy of fiber reinforced plastic (FRP) composites were evaluated by the ultrasonic method. And the results showed that a fly-ash particle can arrest the crack path and thus improve the fracture properties of fibre reinforced plastic composites, and the results have further significance in view of the fact that flyash powder is far cheaper than carbon fibre, glass fibre and epoxy resin.

TL;DR: In this paper, a linear analysis for bending and vibration of sandwich plates consisting of an orthotropic core and unbalanced laminated face plates is presented, and a solution method is proposed through the principle of minimum total potential energy.

TL;DR: In this paper, the authors derived the governing equations of motion for transverse vibrations of curved sandwich beams with viscoelastic cores, assuming a series solution, and evaluated the damping effectiveness of the beam by application of the correspondence principle.

TL;DR: In this article, the analysis and testing of impact damage composite laminates are discussed, and it is shown that uniaxial S-N curves have a generic shape with a pronounced threshold level and that further research is needed to understand the physical reasons for such a threshold value.

TL;DR: In this paper, a simple higher-order shear deformable plate theory was used for predicting the natural frequencies of simply-supported isotropic, orthotropic and laminated composite plates.

TL;DR: In this paper, a model that accounts for the effect of structural changes, resulting from the application of loads, in composite materials is developed, and such changes are incorporated in the theory through a tensor form of a damage variable.

TL;DR: In this article, a mathematical model that calculates the stress fields in the fiber, interphase, and neighboring matrix near a fiber break is presented. But the model does not take into account the elastic-plastic behavior of both the matrix and the interphase.

TL;DR: In this article, a laminate weakened by multiple equal elliptical holes in series is treated as an anisotropic, infinite, multiply connected and thin plate and the general step to deduce the stress concentration in the laminate subjected to arbitrary in-plane loads at infinity is obtained.

TL;DR: In this paper, the flexural vibrations of laminated fiber-polymer composite structures (FPCs) can be damped as desired by the incorporation of a soft ply placed optimally in the zero line of longitudinal flexural stress.

TL;DR: In this article, the authors examined the correlation of experimental and theoretically predicted Poisson's ratios around the angles in the plane of the laminate for both unidirectional and woven roving fibreglass panels.

TL;DR: In this article, an exact flexural analysis of rectangular simply supported single-layer and two-layer cross-ply plates of bimodulus materials is presented, which is based on a higher-order shear deformation theory.

TL;DR: In this paper, the authors compared simple exact solutions for the static deflections, buckling loads and vibration frequencies of simply-supported plates and those arising from the reduced bending stiffness (RBS) method.

TL;DR: In this paper, a comparison of ARALL laminates with other aircraft materials on a structural level shows that ARALL laminate is a very attractive material, especially for fatigue dominated structural parts.

TL;DR: In this article, the concept of damage in fiber-reinforced composites is discussed in analytical and practical terms, and the damage which occurs mainly in the resin and interfaces between resin and fibres is considered to be the same in both static and cyclic loading conditions.

TL;DR: In this paper, a semi-analytical solution for axisymmetric buckling for perfect complete thick orthotropic spherical shells and hemispherical shells under various edge conditions, subjected to uniform full external pressures, is presented.

TL;DR: In this paper, a rationalised approach and cumulative damage model are proposed to relate non-destructive evaluation measurements to life and residual strength of advanced composite aircraft structures, which is defined as the ability to assess and reassess the effect of change in operational use on fatigue damage accumulation.

TL;DR: In this paper, the constitutive relations for the specially orthotropic lamina under a plane stress state are employed with a linear shell theory, to obtain the governing equations for the multi-layered cylindrical shell with through thickness symmetry, when subject to a general loading system.

TL;DR: In this paper, a theoretical approach for the multi-layered, cross-ply GRP cylindrical shell with through thickness symmetry subject to a general loading system is presented, and the method is used to examine the behaviour of the shell when subjected to a uniformly distributed radial load, and to explore the capability of the design procedure proposed by the recently revised BS 4994, to predict adequately stress values that can be used in the design of multilayer systems.

TL;DR: In this paper, the effect of fiber orientation on the frequencies of thin square orthotropic plates was studied using the Rayleigh-Ritz method for various boundary conditions, and the main purpose of the study was to find out in what way boundary conditions influence the frequency of orthotropic square plates.

TL;DR: Fracture toughness of glass/epoxy quasi-isotropic (QIL) and crossplied (0/90)4s laminates (CPL) has been investigated through the J- integral approach as discussed by the authors.

TL;DR: In this paper, the buckling of complete and annular circular plates, made of symmetric laminates with general orientation of the lamina fibers, is dealt with, where the plate is subjected to an in-plane, symmetric, destabilizing load.