Showing papers in "Composites Science and Technology in 1997"

TL;DR: In this article, the influence of applied load, sliding speed, wearing surface hardness, reinforcement fracture toughness and morphology are critical parameters in relation to the wear regime encountered by the material.

TL;DR: In this paper, the electrical properties of short-sisal-fiber-reinforced low-density polyethylene composites have been studied and various surface treatments such as alkali, CTDIC, stearic acid, peroxide, permanganate and acetylation were carried out on the sisal fibers to improve interfacial bonding.

TL;DR: In this article, a semi-empirical fatigue criterion is proposed to measure delamination fatigue-crack growth on unidirectional glass/epoxy laminates.

TL;DR: In this paper, the authors studied matrix crack growth behavior under quasi-static and mechanical fatigue loadings in quasi-isotropic (0/90 −45/ + 45 ) s GRP laminates.

TL;DR: In this article, the flexural strength and interlaminar shear strength of stitched and non-stitched glass-reinforced plastic (GRP) laminates were studied under conditions of increasing impact energy and increasing number of repeated impacts.

TL;DR: In this paper, a single-filament model of a commercial glass-fiber-reinforcement manufacturing process was used to apply methacryloxy and amino silanes with one, two, and three silanols (mono-ol, diol, and triol) to two different glass fibers in a molecular model.

TL;DR: In this paper, the authors investigated the macro-mechanical behavior of warp-knit fabrics and unidirectional prepreg tape laminates, and found that the failure mechanism of non-crimp fabrics may be linked to crimp in the tows, but with subtle differences driving failure in tension and compression.

TL;DR: In this article, it is shown that the four direct methods currently used for interface measurement have problems that make their results inconsistent between methods and inaccurate, and that the most useful method may well be to measure the off-axis tensile strength of unidirectional composites.

TL;DR: In this article, the evolution of microstructure in dry plain-weave fabric during large shear deformation is described, where the entire geometry of the unit cell is defined by four sinusoidal curves in terms of yarn width, yarn spacing and fabric thickness.

TL;DR: In this paper, a model to predict the velocity drop in the more open regions bounding these fiber bundles is proposed, and the effect is found to be significant, and should be taken in account in developing more accurate models, especially for high fiber-content preforms.

TL;DR: In this article, the authors measured the residual tensile stress in a thermoplastic matrix and a toughened thermosetting matrix, both reinforced with carbon fiber, and showed that after 200 days at ambient conditions, these stresses can decay by approximately one-quarter.

TL;DR: In this article, an analytical method called the selective averaging method (SAM) was proposed for prediction of the thermoelastic constants of textile composite materials, where the unit cell of the composite is divided into slices (mesoscale), and the slices are subdivided into elements (microscale).

TL;DR: In this article, the authors describe analytical models for predicting tensile properties of knitted fabric-reinforced composites, using a cross-over model and laminated plate theory.

TL;DR: In this paper, the thermal and mechanical properties of Kevlar-49/epoxy-resin laminates were compared by two different routes, namely autoclaving and oven-curing, and their properties were compared.

TL;DR: In this paper, an ion-depletion-depth model is proposed to explain the mechanisms of fiber surface cracking; the axial crack formation is most likely associated with a larger ion depletion depth than the spiral crack formation.

TL;DR: The role of adhesion between aluminum sheets and fiber composite prepreg on the mechanical property profiles of carbon-fiber-reinforced metal laminates has been investigated in this paper.

TL;DR: Several theoretical models have been analyzed to determine the local (ultimate) adhesive bond strength for a thin-fibre/thermoplastic-matrix system, proceeding from experimental data obtained by the fragmentation and pull-out techniques as mentioned in this paper.

TL;DR: In this article, an analysis of the influence of moisture on the mechanical properties and kinetics of damage is presented in a glass/epoxy laminate pipe for fluid circuit applications.

TL;DR: In this paper, the results of the wavelet-transform-based decomposition of acoustic emission signals are presented, showing that the information in the three dominant wavelet levels may be related to different failure modes associated with fracture of CFRP composites.

TL;DR: In this article, Raman spectroscopy is used to determine the influence of inter-fibre spacing on the stress concentration factor (SCF) resulting from a fibre break in a two-dimensional (2-D) carbon/epoxy microcomposite.

TL;DR: In this article, the relationship between fiber surface chemistry and interfacial bond formation in carbon-fibre/epoxy composites is explored, and the single-filament fragmentation test is employed to estimate the adhesion of these modified fibres to an epoxy resin.

TL;DR: In this paper, a program was developed to determine the interfacial strength (normal to the fiber) of an interlayer hybrid composite which has been exposed to seawater for two different lengths of time.

TL;DR: In this article, the authors investigated the interlaminar and intralaminar fracture toughness of a thermoplastic and a toughened thermosetting polymer reinforced with aligned and cross-ply carbon fibres over a wide range of temperature.

TL;DR: In this article, the effects of simple shear deformation on the elastic properties of engineered and woven glass fabrics are investigated, using established methods and compared with experimental data for a range of fabric architectures.

TL;DR: In this paper, the top skin is modeled as a linear elastic beam and the core as an elastic-plastic foundation, which is used successfully to predict the loads at which the core yields and the skin fails.

TL;DR: In this paper, a fiber-inclination model is developed and extended to predict tensile strength of three-dimensional braided composite materials, based on the transverse isotropy of unidirectional laminae and the Tsai-Wu polynomial failure criterion.

TL;DR: A quantitative characterization and response analysis of a multi-phase representative material by the use of Voronoi cells as a unified tool and results are used for establishing anisotropy measures, and for evaluating statistical functions of stresses.

TL;DR: In this article, a novel composite material consisting of ultra-high-molecular-weight polyethylene (UHMWPE) fibers and matrix has been prepared, characterized and shown to possess unique properties, in particular an elongation of over 70% in the direction transverse to the fibers which induces transverse orientation of the matrix.

TL;DR: In this paper, the shape of the tensiogram depends on both fibre surface and resins chemistry, and the slope of the force versus stage position plots represents the fibre/matrix interaction as swelling or acid base interaction and depends on stage speed and fibre roughness.

TL;DR: In this article, a smoothed particle hydrodynamics (SPH) technique in conjunction with the macro-homogeneous, anisotropic material concept for fiber composites has been proposed for the simulation of impact damage and penetration of composite structures.