Issue 46

S.M. Medjdoub et alii, Frattura ed Integrità Strutturale, 46 (2018) 102-112; DOI: 10.3221/IGF-ESIS.46.11 104 geometrical and mechanical characteristics of the pipeline, the composite wrap and the adhesive are shown in Tab. 1 and 2 respectively. Figure 1 : Repair by composite wrap of a semi-elliptical crack in a pressurized cylinder. Symbol Value Description L 9000 Pipeline length (mm) D 864 Pipeline outside diameter (mm) D i 847.44 Pipeline inside diameter (mm) t 8.28 Pipeline wall thickness (mm) a 2.8 Crack depth (mm) C 7.7 Half crack length (mm) Lw [100-350 -600] Composite wrap length (mm) tw [6-18-30] Composite wrap thickness (mm) Aw [30- 195 -360] Composite wrap recovery angle(°) ta 0.1 Adhesive thickness (mm) Table 1 : Dimensions of typical repair of pipeline. Property Material Description Steel Glass/Epoxy Adhesive E1 209000 159000 2400 Young's modulus in X direction (MPa) E 2 25400 Young's modulus in Y direction (MPa) E 3 25400 Young's modulus in Z direction (MPa) ν 12 0.3 0.28 0.3 Poisson's Ratio in X-Y plan ν 13 0.28 Poisson's Ratio in X-Z plan ν 23 0.15 Poisson's Ratio in Y-Z plan G 12 7190 Shear modulus in X-Y plan (MPa) G 13 5430 Shear modulus in X-Z plan (MPa) G 23 5430 Shear modulus in Y-Z plan (MPa) σ y 456000 Yield stress (MPa) Table 2 : Mechanical proprieties of materials.