D. Leguillon et al., The onset of delamination at stress-free edges in angle-ply laminates - analysis of two criteria, COMP SCI T, 61(3), 2001, pp. 377-382
Prediction of delamination onset in [+/-theta](s) angle-ply carbon-fiber/ep
oxy-resin laminates is proposed by means of two approaches. Both are based
on a preliminary analysis of the boundary effects. In the first, more class
ical, case, an 'average stress' criterion retaining only the interface shea
r component of the stress field is used. Layer-thickness influence is taken
into account to estimate the averaging length. The second case takes advan
tage of the stress concentrations caused by singularities to put to work an
incremental Griffith-like criterion. Initiation is considered to be a loca
lly unstable process. It requires us to account for the existence of surfac
e flaws to explain the influence of layer thickness on the critical delamin
ation stress. (C) 2001 Elsevier Science Ltd. All rights reserved.