Issue 49

D. E. Belhadri et alii, Frattura ed Integrità Strutturale, 49 (2019) 599-613; DOI: 10.3221/IGF-ESIS.49.55 602 Table 1: Material’s properties. Figure. 3: Mesh type of the model and a geometry of the repaired pipe. F INITE ELEMENT MODELING he cracked pipe was modeled using ABAQUS 6.14 [24], and meshed using a structured mesh with three-dimensional hex-dominated quadratic elements with a focused mesh surrounding the crack-tip of 0.02 mm element [24, 25, 26, 27, 28]. A meshed pipe is shown in Fig. 3. The reduced, C3D20R integration elements are used in this modelization to compute the stress intensity factors. Only a quarter of the specimen was modeled due to symmetry conditions. The procedure used in the finite element analysis involved the following steps: (i) the internal pressure was applied to the API 5L X65 properties [21] Young’s modulus (GPa) 205 Poisson’s ratio 0.3 Minimum yield stress (MPa) 415 Yield strain 0.5% Glass epoxy composite properties [22] Young’s modulus E 1 (GPa) 55 Young’s modulus E 2 , E 3 (GPa) 15.2 Poisson’s ratio υ 12 , υ 13 0.254 Poisson’s ratio υ 23 0.428 Shear modulus G 12 , G 13 (GPa ) 4.7 Shear modulus G 23 (GPa) 3.28 Adhesive (FM73) properties [23] Young’s modulus (GPa) 3.28 Poisson’s ratio 0.45 T