Issue 52

W. N. Bouzitouna et alii, Frattura ed Integrità Strutturale, 52 (2020) 256-268; DOI: 10.3221/IGF-ESIS.52.20

Figure 2: Stress distribution at the notch root together with relative stress gradient.[20]

G EOMETRICAL AND MATERIAL PROPERTIES

A

typical basic geometry and loading, adhesive layer and composite patch are shown in Fig. 3, the plates were made of a 2024-T3 Aluminum alloy containing lateral U- notch repaired with boron/epoxy composites and bonded with a thin layer of FM73 adhesive, subjected to a uniaxial loading of 65 MPa. The plate has the following dimensions: length= 160 mm, width= 39 mm, thickness = 3 mm and the dimensions of the notch are: radius ρ = 0.25 mm, length= 9.75 mm the length of one side square patch repair is 25 mm and its thickness is 1.5 mm. the thickness of adhesive is 0.1 mm. Material properties of the aluminum plate, adhesive and composite patch are given in Tabs. 1 and 2. The plate and the adhesive are considered as isotrop while the composite patch is modeled as an orthotrop [21,22].

Figure 3: Geometry of the repaired model. (a) front view (b) side view (c) 3D view

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