Showing papers in "Composites in 1974"

TL;DR: In this article, two types of hybrid composite materials, consisting of alternatively laminated layers of type 1 carbon fibres and glass fibres in an epoxy resin, have been made, with the alternate layers either unbonded or bonded together.

TL;DR: In this paper, the elastic constants and strength of unidirectional carbon fiber reinforced plastices (cfrp) made from both types 1 and 2 fibres, loaded in compression normal to the fibre direction were measured.

TL;DR: In this paper, the effects of fiber misorientation were examined by considering (1) a network model due to Cook; (2) a series averaging, and (3) a Parallel averaging model for Young's modulus.

TL;DR: The properties of mortars, concretes, or other composites based on inorganic cements such as fibre reinforced systems can be greatly improved by the addition of polymers as discussed by the authors.

TL;DR: In this article, the theoretical and practical aspects of mica-reinforced plastics materials were considered and it was suggested that the most promising area for full utilization of the planar reinforcing properties of Mica is in sheet materials, although other fabrication techniques are being investigated.

TL;DR: In this article, a number of composites consisting of uniaxial carbon fibres in an epoxy resin matrix have been used for charpy impact tests and the results show that there is a critical length-to-depth ratio which marks a change of fracture mode from a relatively brittle transverse cracking to a tougher mode involving extensive delamination.

TL;DR: In this paper, a 3-point loading system was used on standard long-beam flexure and short beam specimens, and a specially constructed 4-point bending rig was used for reversed bending tests, showing that the severity of cyclic stresses below the static failure stress value is greatest under conditions where the shear stress parallel to the fiber axis is relatively high, or where a significant interlaminar weakness exists.

TL;DR: In this paper, the use of automatic dielectrometry to monitor the process under autoclave conditions, giving an accurate prediction of the gel point, is described, and the need to stage the prepreg system is eliminated, and optimum mechanical properties of the resulting laminate can be obtained.

TL;DR: In this paper, a variety of experimental techniques used in the United States to characterize the static mechanical properties of filament-wound composites, such as used in vessels subjected to internal pressure, are discussed.

TL;DR: S-N curves have been determined for the axial zero-tension fatigue behavior of uniaxial lay-up Morganite IIIS carbon fibre/CIBA LY 558: HT 973 epoxy resin composites.

TL;DR: In this article, the authors examined the cyclic fatigue properties of metal matrix composites obtained in tension-tension and plain reverse bending and found that a considerable amount of variability exists between systems.

TL;DR: A literature review carried out at the Rubber and Plastics Association (RAPRA) sponsored by the British Plastics Federation (BPF) Building Group has been published in this paper, which has since been considerably condensed and updated.

TL;DR: In this paper, the stiffness of a unidirectional glass fiber-epoxy laminate was found to be time-dependent, but to a degree which varied considerably with direction in the plane of the laminate.

TL;DR: In this article, the use of fiber reinforced plastics in corrosion resistant applications is discussed and some examples of current applications are given and illustrated, as well as technical and economic advantages are discussed.

TL;DR: In this article, changes in transmission of a helium-neon laser beam by 15 μm diameter glass fibres in polyester resin composites have been observed during several different processes, including the application of external stress and exposure to hot water.

TL;DR: These flame- and plasma-sprayed ceramic devices meet both medical and engineering requirements for soft tissue implants and are physically and chemically stable through long term exposure to the environment and are easily fabricated.

TL;DR: In this article, composites consisting of an epoxy resin filled with glass spheres were found to be as stiff in shear as in tension relative to the matrix materials, except for the direction of fibre alignment where the tensile stiffness is always very high.

TL;DR: Titanium-beryllium composites have been developed over a broad range of compositions to take advantage of the low density and high modulus of the beryllium and the strength and toughness of the titanium as discussed by the authors.

TL;DR: In this article, an experimental evaluation of the effects of repeated loading and creep on the measurement of the shear strength and modulus of unidirectional carbon fiber-reinforced plastics is described.

TL;DR: In this article, it is argued that conventional constant amplitude fatigue tests on plain specimens are of limited value for assessing the fatigue performance of cfrp in structural form and suggestions are made for more meaningful fatigue tests in which specimens containing structural features are tested under an elementary form of variable amplitude loading.

TL;DR: In this paper, the development of a new class of polyimide resins, together with preliminary test data on laminates made using such resins is described, and the results seem to indicate potential applications in the aerospace and other speciality industries, since the resins exhibit useful elevated temperature properties.

TL;DR: In the USA, the development of boron fiber reinforced composites preceded that of carbon fiber as mentioned in this paper, and the work which has been done in the United States on BFR and BORON reinforced composite materials is reviewed in this article.

TL;DR: A specification for improved aluminium/balsa floors was produced and flight trials began with aluminium/aluminium honeycomb floors as mentioned in this paper, which are much lighter than earlier types of flooring and more cost-effective.

TL;DR: In this article, the US Ministry of Defense publish specifications covering the supply of specific grades of material, and the ASTM provides a coding system for identifying these materials, which can be used to identify the materials.

TL;DR: In this paper, the relationship between a material's physical properties and its sound insulation is discussed and the sound insulation of composite materials can be estimated provided that these physical properties are known.

TL;DR: The published specifications for phenolic and silicone resins intended for use in the production of composites are confined to three US Military specifications and two issued by the German Ministry of Defence as discussed by the authors.