P. Berbinau et al., On the failure criteria for unidirectional carbon fibre composite materials under compression, INT AP MECH, 35(5), 1999, pp. 462-468
In studying shear stresses that develop in the matrix as a consequence of m
icrobuckling of fibres in a unidimensional composite it has been shown that
the fibre failure criterion based on the tensile stresses on its convex si
de is not realistic because it gives shear strains in the surrounding matri
x which are beyond the ultimate shear strains measured experimentally. In f
act, it is shown that fibres fail under local compression on their concave
side before failing in local tension, and that such a compression fibre fai
lure crierion is in agreement with experimental data. Furthermore, the pres
ent study confirms that the microbuckling half-wavelength is equal to the k
ink band width for current carbon fibre/epoxy systems.