Showing papers in "Composites Engineering in 1995"

TL;DR: In this article, the use of a genetic algorithm for the minimum thickness design of composite laminated plates is explored, by incorporating knowledge of the physics of the problem into the genetic algorithm.

TL;DR: In this article, it was found that the ability of a bamboo cell to generate electrical signals when stressed was an apparently similar function to that of the piezoelectric effect in bone which is stressed.

TL;DR: In this paper, the composite laminate is modeled at a meso scale as a stacking of homogeneous layers connected by interfaces, and both onset of delamination and its propagation on a short distance are predicted.

TL;DR: In this paper, a self-consistent method has been proposed to estimate the effective properties of composite materials with respect to volume fraction distributions, and it is shown that certain assumed property distributions presented in the literature must be used with care as they are not physically realizable for certain material combinations.

TL;DR: In this article, a micromechanical formulation is presented for the prediction of the overall thermo-inelastic behavior of multiphase composites which consist of short fibers, which is an extension of the generalized method of cells that was previously derived for inelastic composites with continuous fibers, and the reliability was critically examined in several situations.

TL;DR: In this article, a finite element formulation for the analysis of the free vibration of composite plates with multiple delaminations is presented, which can be easily used to compute the natural frequencies and mode shapes of delaminated plates with arbitrary boundary conditions.

TL;DR: In this article, the bending behavior of a sandwich beam with a "soft" core and unsymmetrical laminated composite skins has been analyzed, and the effects of the extension-bending coupling caused by the layups of composite panels have been presented.

TL;DR: In this paper, the concept of stress and strain control via interlayers is investigated by considering a homogeneous compliant interlayer, a composite interlayer and a variety of functional gradient material (FGM)-interlayers.

TL;DR: In this paper, the authors present a formulation of the stability problem for a rectangular composite plate reinforced by two types of fibers, one of them being both stiffer and more expensive than the other.

TL;DR: In this article, effective properties and local stress variations of elastic fiber composites are studied by means of the homogenization method, and two different methods, "the displacement method" and "the force method" for solving the so called cell problem are derived, applied and compared.

TL;DR: In this article, an analytical study of optimal fiber direction for improving the lateral buckling strength of thin-walled composite open-section members is presented based on a Vlasov-type linear hypothesis, which accounts for cross-section geometry and for material anisotropy of the section as well as the geometrical characteristics of columns.

TL;DR: In this article, a computerized metallographic image analysis technique is used to measure the laminate homogeneity and the volume fraction gradients for composites produced on each tooling geometry.

TL;DR: In this article, an experimental study was carried out on woven fabric/epoxy composites focusing on their mechanical properties under uniaxial tensile, flexural, compressive, short beam shear and Mode I interlaminar fracture loading conditions.

TL;DR: In this paper, a method of calculating the water content of a composite material as a function of ageing and the degree of damage was described, and the parameters of the Langmuir model and the diffusion law were determined.

TL;DR: In this paper, the results of thermal shock and fatigue tests conducted on ZrO2-based thermal barrier coating systems under the temperature environments for advanced gas turbines were presented, where a CO2 laser heating method was employed to heat two types of cylindrical specimens with conventional two-layer coating and functionally graded coating.

TL;DR: In this article, the authors considered the torsion of cylindrical bars with inhomogeneous shear moduli under different assumptions on the cross-sectional geometry, and the spatial variation law for the moduli.

TL;DR: The role of mechanical properties of composite material in dome contour design has been investigated in this paper, and it has been shown that the optimal dome profile depends on the ratio of longitudinal Young's modulus to transverse Youngs modulus in individual laminae (E x / E y ).

TL;DR: In this paper, an analytical study was performed in order to investigate the effect of architecture and material properties on the initiation of surface cracking in functionally graded ceramic coatings, and the mode of crack initiation was tension resulting from stress relaxation.

TL;DR: In this article, a single-shot explosive welding technique was used to fuse multilayered metal base composites, mainly reinforced with steel sheets, using a one-dimensional finite-difference calculation.

TL;DR: In this paper, a finite element model of NITINOL-reinforced composites is developed to describe the interaction between the external loads, operating conditions and the geometrical and physical parameters of the composite plate and the NITinOL fibers.

TL;DR: In this article, a thermal finite element model is developed to determine steady-state and transient temperature distributions inside NITINOL-reinforced composite plates resulting from different activation strategies of the NITinOL fibers.

TL;DR: In this paper, the effects of temperature and moisture content on viscoelastic responses of GY70/339, T300/934 and kevlar-epoxy laminated composites were investigated using finite element analyses.

TL;DR: In this article, the thermal conductivity of textile composites made from plain weaves and 3D XYZ weaves is quantified and the effect of fiber type and fiber volume fraction is investigated.

TL;DR: In this paper, the influence of fiber type and method of composite fabrication on the thermal shock behavior of 2D fiber-reinforced ceramic composites has been studied, and it is shown that the composites possess superior resistance to thermal shock damage than the monolithic ceramics.

TL;DR: In this article, a method is derived to predict the homogenized damping properties analytically based on the micromechanical theory of a representative fiber-matrix cell.

TL;DR: Two-and three-dimensional linearly elastic glass/epoxy and carbon-epoxy laminates of the type [0m/90n/ + theta(p)/ -theta(q))s]M containing periodically distributed matrix cracks have been analyzed in this paper.

TL;DR: In this paper, a higher-order theory for functionally graded materials has been developed that explicitly couples the microstructural and macrostructural effects, thereby providing both a rational methodology for analyzing the response of this new class of materials and a means for evaluating the uncoupled RVE-based micromechanics approach.

TL;DR: In this paper, a special purpose finite element method for design of multiple-row composite joints under generalized inplane loading is presented, where the stress analysis is carried out in two steps.

TL;DR: In this article, the low-velocity impact of adhesive-bonded single-lap composite joints has been studied using a spring-mass model, where the impact response is represented by a time-dependent force, and the target joint was represented by an equivalent mass with equivalent stiffness.