Showing papers in "Composites Science and Technology in 1985"

TL;DR: In this paper, the stiffness reduction due to matrix cracking in a (0/90) s glass fiber reinforced plastic (GFRP) laminate has been studied under both quasi-static and fatigue loading.

TL;DR: In this paper, the fracture behavior of composites with thermoplastic matrices of different fracture toughness Kcm was studied and the microstructural details and the dominant mechanisms of energy adsorption during breakdown of the composites were defined.

TL;DR: In this article, the dynamics of the fiber pullout process is examined, and it is shown that the work of fracture of the interface can be determined in a single fibre pull-out test.

TL;DR: In this article, a general relationship is presented to predict the effective transport properties of composite materials in terms of the properties and concentration of the components and the internal microstructure of the composite materials.

TL;DR: In this paper, the cumulative damage problem is formulated in terms of a damage function which must satisfy certain conditions, which can be used with residual life theory as well as with residual strength theory.

TL;DR: In this paper, a graphite-epoxy laminate of cross-ply (0/90) lamination is subjected to uniaxial tension, and transverse cracks in the 90° ply can be induced at strains as low as 0·3%.

TL;DR: In this article, pullout was governed by friction, with maximum shear stresses of 7-10 MPa for polyester, and 21-34 MPA for epoxy, the higher values being obtained for the post-cured resins.

TL;DR: In this article, the energy-absorbing characteristics in axial collapse of structures made from fiber-reinforced plastic (FRP) composites are reviewed from both the materials and the structural viewpoints.

TL;DR: In this paper, various models of creep deformation of composite materials are reviewed and their predictions compared with available experimental data, and the value of analysing transient creep following stress changes to elucidate the creep mechanisms is discussed.

TL;DR: In this article, a stress analysis of orthotropic beams subjected to concentrated loads is performed, within the framework of the classical theory of elasticity, on both three-point and four-point bending.

TL;DR: In this article, a study was made of the mechanical properties and impact performance of carbon fiber/PEEK (0,90), ( ±45 ) and ( ± 45,0 ) laminates and comparisons were made with similar carbon fibre/epoxy laminate Fibre dominated properties such as plain tensile strength were similar to those of epoxy lamination with similar fibres and volume fractions.

TL;DR: In this paper, the electrical behavior of polyester resin filled with aluminum powder is reported for filler concentrations ranging from 0 to 45 vol% and dielectric properties (dielectric constant, loss index, and dissipation factor) are characterized as a function of temperature in the range 20 to 130 °C at frequencies of 1, 10, and 100 kHz.

TL;DR: In this article, the authors investigated correlations between the extraction process, crack formation phenomena and fiber strength, and found that the degree of damage will generally depend upon several factors such as glass content, test temperature, and the aggressiveness of the chemical environment.

TL;DR: The large scale social changes which influence the development of new materials are reviewed and the new materials and processing methods being developed in response to these are described and contrasted with some recent advances in composite materials science.

TL;DR: In this article, single production fibres have been embedded in polyester and epoxy resins, and pulled out under carefully controlled conditions, at the same time external pressure was applied to the matrix.

TL;DR: In this article, a higher-order plate theory was used to analyze a complete double cantilever beam specimen and the effect of specimen geometry on energy release rate was investigated numerically.

TL;DR: In this paper, a model for stiffness reduction due to transverse ply crack growth during the fatigue of a (0/90)s glass-fibre reinforced plastic laminate was developed.

TL;DR: In this article, the authors focus on the toughness of a thermoplastic composite, namely, poly ether-ether-ketone (PEEK) reinforced with 60% by volume of continous carbon fibres (APC 2).

TL;DR: In this article, a model for the creep behaviour of fibrous composite materials with aligned fibres is presented for both cases where fibres remain rigid in a creeping matrix and cases where the fibres are creeping in a crawling matrix.

TL;DR: The tensile behavior of short-fibre reinforced polymers depends on many factors as mentioned in this paper, such as the radius of the fibres and their aspect ratio, and the effect of high stress concentrations at thick fibres compared to thin ones.

TL;DR: In this article, a porous preform of semi-random short alumina fibres with liquid aluminium alloys, using squeeze-casting techniques, was used to produce sound castings.

TL;DR: In this paper, the formation of amine overlayers on carbon fibres is confirmed and the average amine depths have been calculated from the ESCA data, and the fractions of the carbon fibre surfaces covered by amine monolayers are also estimated.

TL;DR: In this article, the effect of absorbed moisture on the hygrothermal properties has been investigated by dynamic mechanical spectroscopy (dms) and flexural modulus testing for four commercial epoxy-matrix graphite-fiber composite materials.

TL;DR: In this paper, a new model is proposed containing debonding, sliding at the interface and local plastic deformation of the matrix bridges, starting from a micromechanical analysis of the debonding and sliding length, the fracture energies are calculated in general terms.

TL;DR: In this article, the relationship between fiber fracture density and static load level is presented for tensile loading of unidirectional and cross-ply laminates by direct observation of fiber fracture in situ.

TL;DR: In this article, the formation of aluminium carbide at the interface between aluminium and carbon fibres as a result of annealing for 4 h at 550°C or above, or for 1 h at 620°c or above was described.

TL;DR: In this paper, the properties of the polymer poly(vinylidene fluoride) and the amorphous material poly(methyl methacrylate) have been investigated as a function of composition both for glassy ammorphous materials and for partially crystalline materials.

TL;DR: In this article, a model for the development of the basic longitudinal texture is proposed involving a meniscus instability of the propagating crack front, which gives rise to a series of fingers protruding into the bulk resin ahead of the nominal crack front.

TL;DR: In this article, a tow of aramid or graphite fibers impregnated with a thermoplastic matrix from a proprietary melt-coating process involving injection of a melted thermoplastics polymer can be consolidated into a sound, void-free composite laminate by compression molding.

TL;DR: In this article, the distribution of stress concentration factors (SCFs) in a unidirectional composite sheet in which the fiber spacing is random is discussed. But the authors do not consider the effect of the fiber size on the performance of the composite.