Energy release rate of the fiber/matrix interface crack in UD composites under transverse loading: Effect of the fiber volume fraction and of the distance to the free surface and to non-adjacent debonds

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

“…In agreement with the introductory considerations of this section and the results in Di Stasio et al, 40 it is possible to observe in Figures 6 and 7 that 21 Â 1 À free and 21 Â 1 À coupling (in which the horizontal displacement u x is left unconstrained on the upper boundary) show both the highest values of Mode I and Mode II ERR as well as the maximum increase with respect to the interactive case (1 Â 1 À free and 1 Â 1 À coupling).…”

“…46 The properties used are listed in Table 1. The model was validated with respect to BEM results of Sandino et al 33 and Parı´s et al; 47 considerations about the order of accuracy can be found in Di Stasio et al 40 Results and discussion Effect of the proximity of the 0 /90 interface and of the thickness of the 0 layer on debond ERR for highly interactive debonds…”

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

“…Observing Figure 4, it is possible to notice that the values of G I for the 1 × Figure 1). As observed in a previous work [36], the presence of fully bonded fibers between partially debonded ones in the loading direction has a strong effect on debond ERR and controls the interaction between debonds. When n is increased, both Mode I and Mode II increase: the addition of stiffer elements, in the form of fully bonded fibers, increase the strain applied to the damaged unit and thus causes higher values of ERR.…”

“…The properties used are listed in Table 1. The model was validated with respect to BEM results of [40,29]; considerations about the order of accuracy can be found in [36]. Observing Figure 4, it is possible to notice that the values of G I for the 1 × Figure 1).…”

“…Looked from this perspective, i.e. moving from the most to the least severe state of damage, this effect is referred to as "strain magnification" [36]. There seems to exist a Comparing Fig.…”