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Showing papers in "Composites Science and Technology in 1986"


Journal ArticleDOI
TL;DR: In this article, the variation of average stress in the matrix, some elastic properties of randomly oriented composites are established as a function of aspect ratio, and the results suggest that the in-plane properties are most effectively reinforced by fibrous inclusions, whereas the out-of-plane ones are more responsive to the disc type.

255 citations


Journal ArticleDOI
TL;DR: The use of composites in primary structural areas of the vehicle, such as body structures, has been very limited to date as discussed by the authors, with the exception of a few specialized low volume vehicles, having been used in semi-structural or decorative parts.

211 citations


Journal ArticleDOI
TL;DR: In this article, an assumption based on the theory of composite beams is presented for the analysis of cross-ply composite laminated plates, under the assumption the in-plane displacements between layers are continuous and the transverse shear stresses between layers is also continuous.

175 citations


Journal ArticleDOI
TL;DR: In this paper, high-strain carbon fiber composites were evaluated by means of ultrasonic C-scanning, optical microscopy and penetrant-enhanced X-radiography.

127 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of various parameters on instability-related delamination growth was studied analytially, and the results were based on the assumption that GI and GII govern delamination growth.

119 citations


Journal ArticleDOI
TL;DR: In this article, the authors developed the mechanics of fatigue damage of a carbon fiber composite laminate, which consists of a delamination front, with associated matrix cracking, which propagates inwards from the sample edges.

112 citations


Journal ArticleDOI
TL;DR: In this paper, the maximum volume fraction achievable for randomly oriented fibres is given by an expression of the form Φ max = kd/L, where d is the fibre diameter, L is the fiber length and k is a constant.

104 citations


Journal ArticleDOI
TL;DR: A finite element analysis of the end-notched flexure (ENF) test specimen for Mode II interlaminar fracture testing of composite materials is presented in this paper, showing that the ENF specimen is a pure Mode II fracture test within the constraints of small deflection theory.

103 citations


Journal ArticleDOI
TL;DR: In this article, a regression analysis of the relationship between interlaminar shear strength (ILSS) and void content was performed for each sample, and a void content criterion V cr which is required for quality evaluation of composites was calculated using the regression lines and the procedures of analysis of variance.

79 citations



Journal ArticleDOI
TL;DR: In this paper, an exact solution is presented for the problem of an infinite cantilever anisotropic plate with only a single plane of elastic symmetry parallel to the xy-plane and with elastic coefficients changing through the thickness.

Journal ArticleDOI
TL;DR: In this article, the buckling of a fiber bundle embedded in epoxy resin was studied to gain insight into compressive failure mechanisms in unidirectional composites, and the failure mode of the bundle was found to be microbuckling of fibers for the first three types of fibers.

Journal ArticleDOI
TL;DR: In this paper, it has been shown that conventional techniques can be used to prepare epoxy resin composites incorporating ultra-high-modulus polyethylene (UHMPE) fibres as the reinforcing phase, either as continuous filament yarn or woven fabric.

Journal ArticleDOI
TL;DR: In this paper, the effects of the geometry of the trigger trigger initiator on the energy absorption capacity of glass fiber reinforced plastic tubes were studied with particular reference to the effect of small samples cut from these tubes.

Journal ArticleDOI
TL;DR: In this paper, the authors present results from several interdisciplinary studies of the mechanical response of composite materials, in which mechanics and materials science were used in concert with NDE to investigate the damage accumulation process.

Journal ArticleDOI
TL;DR: The notch sensitivity of graphite/epoxy fabric laminates was experimentally investigated by conducting tensile tests on specimens made from woven fabric prepreg and those of similar construction made from unidirectional tape prepreg as discussed by the authors.

Journal ArticleDOI
TL;DR: In this paper, twelve different commercial kinds of PAN-based carbon fibres were heat-treated up to 2800°C, without tension, under inert atmosphere and the properties of single filaments were determined.

Journal ArticleDOI
TL;DR: In this paper, a method for the determination of the elastic modulus of cellulose fibers is presented, where cellulose fiber separated by different pulping processes are fractionated in order to get the same aspect ratio.

Journal ArticleDOI
TL;DR: The failure process of short-fibre reinforced thermoplastics is characterized by different energy dissipation mechanisms, especially by mode II debonding along the fibre/matrix interface, sliding of debonded regions, brittle or ductile matrix fracture and pull-out.

Journal ArticleDOI
TL;DR: In this article, the authors considered quasi-static fracture of laminated composite plates with circular or elliptic delaminations due to transverse shear stresses and modeled the system as two laminated plates bonded everywhere except over the area of the disbond.

Journal ArticleDOI
Paolo Conti1
TL;DR: In this article, the influence of geometric parameters on the stress field generated in a laminate with a pin-loaded hole was investigated with the aid of numerical methods and the results have been used in the Azzi-Tsai failure criterion to predict laminate strength.

Journal ArticleDOI
TL;DR: In this paper, a classical elasticity solution for the stress and displacement fields in loaded orthotropic beams is presented and the corresponding stress equations, derived from a stress function which satisfies the orthotropic analogue of the biharmonic equation, are written as Fourier series.

Journal ArticleDOI
TL;DR: In this article, the transverse Young's modulus and axial-transverse shear modulus are derived for uniaxial fiber-composite material and a single formula is derived for their calculation.

Journal ArticleDOI
TL;DR: In this paper, the development of fiber orientation during the mold-filling process was investigated by examining through-thickness microstructures in a series of controlled short shots, and it was shown that the transverse orientation of fibers throughout the core layer did not occur until after the mold was full.

Journal ArticleDOI
TL;DR: In this paper, a computer model has been developed that follows the sequence of fibre failures in a thin layer of unidirectional fiber composite from the breaking strains of the individual fibres.

Journal ArticleDOI
TL;DR: In this paper, four different Union Carbide mesophase-pitch-based carbon fibres were studied by transmission electron microscopy after thin sectioning (transverse and longitudinal sections), and three phases were distinguished, viz. graphite, a microporous turbostratic phase and a phase similar to high-modulus polyacrylonitrile-based fibres.

Journal ArticleDOI
TL;DR: In this paper, the transverse crack failure and delamination of a composite laminate with an outer 90° layer was studied, and the failure pattern near a TC, observed by experiments, was found to be similar to a contour map of equal maximum stresses near the tip.

Journal ArticleDOI
TL;DR: In this article, a finite element method was used to solve the problem of self-equilibration between the fibers and the matrix of carbon fiber/epoxy composites, showing only small deviations from rotational symmetry.

Journal ArticleDOI
TL;DR: In this article, the influence of anisotropy and transition from a thicker to a thinner laminate cross-section (ply-drop) on the decay length of highly anisotropic materials is investigated.

Journal ArticleDOI
TL;DR: In this article, the fracture work of ductile thermoplastics reinforced with short fibres differs in its dependence on fiber content for static and dynamic loading conditions, and it is suggested that this is due to strain-rate dependence of matrix behaviour which affects energy dissipation.