Mj. Starink et S. Syngellakis, Shear lag models for discontinuous composites: fibre end stresses and weakinterface layers, MAT SCI E A, 270(2), 1999, pp. 270-277
A new shear lag (SL) type model for stress transfer in a composite with cyl
indrical fibres is derived. It accounts for fibre end stresses in an approx
imate yet realistic manner, and leads to a new formula for predicting the Y
oung's modulus of the composites. The predictions of this model were found
to agree well with data for metal matrix composites (MMCs) with fibres of v
arious aspect ratios. The accuracy and relative simplicity of the new model
have been exploited in the development of an approximate analytical model
for the stress transfer and macroscopic yield stress of a composite that co
ntains a weak layer in the matrix adjacent to the reinforcement. With the a
id of the latter model, the proof stress of MMCs which contain a precipitat
e free zone (PFZ) around the reinforcement, can be studied; experimental da
ta obtained for aged 8090 MMCs is consistent with the model predictions. (C
) 1999 Elsevier Science S.A. All rights reserved.