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By A. Baker, S. Dutton, D. Kelly

Providing an creation to the know-how of composite fabrics as utilized in aeronautical layout and constitution, this article discusses adjustments among composites and metals, structural layout approaches and in-service functionality of these fabrics.

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Can be determined, for example, from a log-log plot of mean fiber strength for fibers of given lengths versus fiber length. 23) and whose standard deviation is proportional to N - 1/2. Thus, for very large N, all of the bundles tend toward the same strength value O'BL. 13), the length of each bundle (or chain link) being the ineffective length 6. 24) BASIC PRINCIPLES OF FIBER COMPOSITE MATERIALS 41 o" o it I t , t ....... t i / FIBER--~ 81NOE. ----~ ;i II , \ I i % a) /' t b) \ LY Fig. 11 Rosen's model showing a) ineffective length at break and b) perturbation of stress in adjacent fiber.

13 A relationship between G and K can also be obtained for a fiber composite material by modelling it as a continuous linear orthotropic material with the crack propagating on one of the planes of symmetry. Using the analysis for such materials given in Ref. 14, 2 J L ,a,l/ k 2a,1 e l Here the aij terms are the coefficients o f the stresses in the stress-strain law defined using a coordinate system based not on the fiber direction, but on the crack in the "1 direction" and the load in the "2 direction".

100, 1996, pp. 487-506. 1 Introduction to Fiber Composite Systems A fiber composite material consists of a filamentary phase embedded in a continuous matrix phase. , ratio of length to diameter) of the filaments may vary from about 10 to infinity (for continuous fibers). , 25-mm diameter steel bars in concrete). Composite constituents (fibers and matrices) can be conveniently classified according to their elastic moduli E and ductility. Within the composite, the fibers may, in general, be in the form of continuous fibers, discontinuous fibers, or whiskers (very fine single crystals with lengths of the order 100-1000 ixm and diameters of the order 1-10 Ixm) and may be aligned to varying degrees or randomly orientated.

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