Showing papers in "Composites in 1988"

TL;DR: In this article, the dry wear behavior of several polymer composite materials sliding against smooth steel counterparts was investigated and the contribution from the post-sliding wear mechanisms are not directly measurable and were estimated by employing the wear model.

TL;DR: A finite element model of heat conduction has been used to investigate the temperature distribution and thermal cycling associated with the fabrication of continuous carbon fiber-reinforced PEEK (APC2) laminates by tape laying with a laser heat source as discussed by the authors.

TL;DR: In this paper, the authors evaluated the fracture toughness of graphite/epoxy laminates with different tough adhesive interlayers and concluded that selective interleaving at critical spots may produce a significant improvement in the ift of composite laminate.

TL;DR: In this article, zero-tension fatigue testing conditions appropriate to APC-2, continuous carbon fiber reinforced polyetheretherketone, composite materials are discussed, and two multi-angle lay-ups have been tested, each in a variety of thicknesses.

TL;DR: In this paper, failure mechanisms during fatigue were studied using scanning electron microscopy on injection-moulded composites of polyamide 6.6 reinforced with short and long glass fibres.

TL;DR: In this article, an experimental autoclave was designed and commissioned for polymeric diaphragm forming of continuous fiber-reinforced thermoplastic composite parts, which achieved cycle times of 75 minutes.

TL;DR: In this paper, the effect of high hydrostatic pressure on water uptake has been studied and any changes in properties due to this environment revealed, and the absence of a size increased water uptake significantly at all pressures considered.

TL;DR: In this paper, the fracture characteristics of both fibres and matrix in tensile, compressive and flexural failures of carbon fiber-reinforced PEEK composites are described.

TL;DR: In this article, the mechanical properties of steel wire-reinforced aluminium matrix composites were investigated and it was found that their tensile strength was somewhat lower than that predicted by the rule-of-mixtures; failure occurred predominantly by fibre pull-out.

TL;DR: In this article, the effect of anisotropy of the fiber thermal expansion on thermal stress was examined by extending a thick-walled cylinder model for graphite/aluminium composites.

TL;DR: In this paper, a polarization maintaining optical fiber was embedded in a woven glass epoxy composite 3 point bend specimen and loaded to failure to determine the effectiveness of such fibre as a strain gauge and damage indicator.

TL;DR: In this paper, a three-component cylinder model of a unidirectional composite is used to evaluate the importance of an interfacial region in the build-up of residual thermal stress.

TL;DR: In this paper, carbon/carbon composites were made by pyrolysis of polymer composites composed of polyfurfuryl alcohol resin and different surface treated high modulus carbon fibres.

TL;DR: In this article, the strain dependency of the Raman frequencies of carbon fibres has been used in order to map the residual fibre strains in a HMS4/PEEK composite tape.

TL;DR: In this paper, the damage sustained by 16-ply quasi-isotropic carbon/epoxy composite laminates subjected to repeated impact at various energy levels has been quantified.

TL;DR: In this paper, the authors describe the development and use of a time-of-flight ultrasonic C-scanning technique for the detection, sizing and characterization of defects in carbon fiber composite components.

TL;DR: In this paper, the impact resistance of two carbon fibre-reinforced epoxy and three carbon fibre reinforced polyetheretherketone composites of identical laminate structure and very similar fibre contents have been compared by means of a flexed plate test that is commonly used for the assessment of thermoplastics.

TL;DR: In this paper, the impact resistance of polypropylene fiber reinforced concrete (FRC) materials is evaluated using a repeated drop-weight impact apparatus and the effect of span length.

TL;DR: In this article, the use of an available "fibre in matrix" model to represent optical fiber embedded in a composite three-point bend specimen was used to predict the optical fiber stress level whilst embedded in the loaded structure, and experimental failure of such embedded fibre was compared with the failure stress of similarly treated non-embedded fibre.

TL;DR: In this paper, hole stress concentration effects on the tensile strength of SMC-R50 sheet molding compound composites were studied with consideration being given to both centric and eccentric hole locations.

TL;DR: In this article, the effect of load holds on the fatigue performance of impact damaged carbon fibre composite coupons was investigated using two modified versions of a loading spectrum, static failure tests and application of sustained static loading, and examined damage growth together with coupon stiffness during fatigue testing.

TL;DR: In this article, the influence of thermal processing on the crystalline behavior of J-1 polymer, a PACM-based polyamide homopolymer used as a matrix for advanced composites, was studied using differential scanning calorimetry (DSC), cross polarized microscopy, wide angle X-ray scattering (WAXS), and dynamic mechanical analysis (DMA).

TL;DR: In this article, an untreated graded sand-filled polyester resin has been found to exhibit a higher modulus than previously reported for a particulate composite and a discontinuity in the stress-strain curve, which was dependent upon the volume fraction of sand, was observed.

TL;DR: In this paper, a study of failure in tubular specimens composed of AS4/3501-6 carbon/epoxy laminates was carried out, using loadings of internal pressure and axial force to vary the states of stress.

TL;DR: In this article, a cast aluminium alloy LM13 and LM13-5 weight % mica particulate composite were investigated for their resistance to general corrosion, erosion-corrosion and corrosive wear in 3.5% NaCl solution.

TL;DR: In this article, carbon fiber-reinforced epoxy composite laminates were exposed to programs of temperature and humidity intended to represent the high temperature excursions (thermal spikes) caused by ground-reflected engine efflux experienced by vtol aircraft.

TL;DR: This paper showed that the variations in the tensile and flexural moduli of PEEK composites increase linearly with the size of the particles in the moulding, and used quasi-isotropic theory to predict the experimental values from the modulus reduction factor relationship.

TL;DR: In this paper, the use of non-destructive testing to monitor the quality of civil aircraft structures at each stage of development is reviewed, with information on the type of defects detected by the various techniques.