Issue 53

I. Monetto et alii, Frattura ed Integrità Strutturale, 53 (2020) 372-393; DOI: 10.3221/IGF-ESIS.53.29 378 where d K and c K ( K = V 0 , M 0 , N 0 ) are compliance coefficients, which depend on the relative thickness-wise position  of the delamination, on the orthotropy ratios  and  , and on the correction factor k w , as detailed in what follows. Figure 2: Schematics of the elementary loading conditions considered for the analytical derivation of the compliance coefficients. (1) Symmetrical transverse forces The first schematic, shown in Fig. 2(s1), corresponds to the end loading with V 0 ≠ 0, M 0 =0 and N 0 =0. In this case, we have 0 2 3(1 ) 2 V w d k     (18) and 0 1 (1 ) V x s w xz c E F k G       (19) with 1 1 1 1 ˆ for 1 or 0 2 ˆ 1 for 1 or 0 ˆ for 1 or 0 1 2 H H H d F H d H d H                      (20) where 2 2 2 6 (1 ) xz s w x H G k E            (21) noting that 2( / / ) x xz xz E G      . (2) Symmetrical bending The second schematic, shown in Fig. 2(s2), corresponds to the end loading with M 0 ≠ 0 and V 0 = N 0 =0. In this case, we obtain 0 0 M V c d  defined by Eqn. (18), according to Betti's theorem, and 0 2 6 (1 ) M x s xz d E F G      (22)