Qd. Zeng, A RANDOM CRITICAL-CORE THEORY OF MICRODAMAGE IN INTERPLY HYBRID COMPOSITES .2. ULTIMATE FAILURE, Composites science and technology, 52(4), 1994, pp. 481-487
This paper discusses the ultimate-failure behaviour of interply hybrid
composites consisting of one layer of low-elongation fibre/epoxy sand
wiched between two or more layers of high-elongation fibre/epoxy under
uniaxial tension. A modified shear-lag model was first proposed for s
olving the stress redistributions resulting from both failure of some
layers and breakage of fibres in the high-elongation layers. The rando
m critical-core probability model was then adapted for the statistical
analysis of the ultimate-failure process in hybrids, and the ineffect
ive length required in this study was obtained by using a simple limit
analysis. The predictions of the ultimate-failure strain of hybrids w
ere compared with the existing experimental results, and reasonable ag
reement was obtained.