Issue 53

A. Moulgada et alii, Frattura ed Integrità Strutturale, 53 (2020) 187-201; DOI: 10.3221/IGF-ESIS.53.16 189 stressed in uni-axial tension in the vertical direction "y" under the applied stress of varying amplitude σ (20, 40, 60, 80 and 100 MPa).The plate was repaired by an external rectangular patch. Material properties The mechanical characteristics of the assembly materials (plate, patch and the adhesive layer) are shown in the Tab. 2 and 3, the Fig.1 shows the geometric model of the structure used. Figure 1: Geometrical model of the repaired plate. Table 2: Mechanical properties of the boron/epoxy and the carbon/epoxy composite (a) ( b) Figure 2: Stress-strain curve: a) - Aluminum plate 2024 T3 b) -Adekit A140 adhesive [29] Four (04) stacking sequences have been put on the proposed composite, namely Boron / Epoxy and Carbon/Epoxy that is distributed as follows: (0 ° / 45 ° / 60 ° / 90 °) Fiber orientation. Material E 1 (GPa) E 2 E 3 G 12 (MPa) G 13 G 23 ν 12 ν 13 ν 23 Bore/Epoxy 109.0 8.819 8.819 4315 4310 3200 0.342 0.342 0.38 Carbone/Epoxy 138.0 9.500 9.500 5200 5200 1450 0.28 0.28 0.40 Embedding W  H Adhesive Patch Plate