Micromechanical study on the influence of scale effect in the first stage of damage in composites

Energy release rate of fiber/matrix interface crack growth in cross-ply laminates under transverse loading: effect of the 0/90 interface and of 0 layer thickness

“…The analysis presented in this article brings new arguments to the claim that the ply-thickness effect does not influence the growth of debonds. The results reported in this article strengthen the claim that the ply-thickness effect does not influence the growth of individual debonds, as previously suggested in the literature [6,17,32,33].…”

“…10 and is considered. Analogous results can be found in [32,33], where the authors investigate the ply-thickness effect on debond growth in cross-ply laminates using: first, a single centrally-placed partially debonded fiber with surrounding matrix corresponding to V f = 55%, embedded from all sides in a homogenized No measurable ply-thickness effect was observed. Experimental support to the claim that the ply-thickness effect has no influence on debond growth can be also found in the literature, in [6].…”

“…Different studies have followed the LEFM approach and analyzed models of one or two fibers in an effectively infinite matrix [26,27,28,29,30] and of an hexagonal cluster of fibers in an effectively infinite homogenized UD composite [31,24]. The problem of debond growth along the fiber-matrix interface in a cross-ply laminate has been only treated very recently in [32,33],…”

Effect of the proximity to the 0°/90° interface on Energy Release Rate of fiber/matrix interface crack growth in the 90°-ply of a cross-ply laminate under tensile loading

“…36 and París et al. 37 where authors embed a single partially debonded fiber in an effectively infinite homogenized 90∘ ply bounded by homogenized 0∘ layers. Thus, the effect of debond–debond interaction and of the relative proximity of a 0∘/90∘ interface on debond ERR in cross-ply laminates is yet to be addressed.…”

“…CZM-based works 15–18 have addressed the effect of macroscopic features such as the thickness of the 0∘ and of the 90∘ ply, while microscopical effects such as the presence of neighboring fully bonded fibers or of other debonds where neglected due to the choice of adopting random distribution of fibers. Previous LEFM studies 28,30–37 focused on both macroscopical (e.g. ply thickness) and microscopical (e.g.…”