PSI - Issue 81

V.S. Kravets et al. / Procedia Structural Integrity 81 (2026) 102–108

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0 / c c q q ( b ) for orthotropic body with different parameters 3  and 3 с %

Fig. 2. Influence of crack filling volume a / l on relative SIF Ш F ( a ) and CSL

(dashed line – isotropic material).

Influence of crack filling volume ( a/l ) and orthotropy level parameter 3  on SIFs for constant relative average shear stiffness 3 с % of different orthotropic body materials shown in the Fig. 3 a . The similar behavior of SIFs for a specific orthotropic material (S-Glass/Epoxy 13 23 6500 , 3100 G MPa G MPa   Serensen and Zaitsev (1982)) can be seen in the Fig. 3 b for two orientations of material orthotropy axes 13 23 3 , ( 0.6906) yz xz G G G G     and 13 23 3 , ( 1.448) xz yz G G G G     . Calculations were carried out for parameters 13 0 13 / 1, / 0.05, / 0.1 q G G G c l    .

Fig. 3. The relative SIF Ш F dependences on the parameter a / l for 3 с const  % and different orthotropic materials ( a ), for S-Glass/Epoxy material ( b ) (dashed line – corresponding isotropic material).

The influence of the shape of the crack-like defect on the healing process is insignificant (Fig. 4) and manifests itself only when the crack area is almost completely filled ( a/l > 0.7). The thickness of the filling area (parameter c/l ) has a more significant influence and as it increases, the strengthening effect decreases (dashed lines). Calculations were carried out for parameters 13 3 3 , / 0.1( 3.162, 0.3162) xz yz xz G G G G c      % , 13 / 1 q G  , 0 13 / 0.05 G G  .