Issue 46

S.M. Medjdoub et alii, Frattura ed Integrità Strutturale, 46 (2018) 102-112; DOI: 10.3221/IGF-ESIS.46.11

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 9000

Description

L

Pipeline length (mm)

D D i

864

Pipeline outside diameter (mm) Pipeline inside diameter (mm) Pipeline wall thickness (mm)

847.44

t

8.28

a

2.8 7.7

Crack depth (mm)

C

Half crack length (mm)

Lw

[100-350 -600]

Composite wrap length (mm) Composite wrap thickness (mm) Composite wrap recovery angle(°)

tw

[6-18-30]

Aw

[30- 195 -360]

ta

0.1

Adhesive thickness (mm)

Table 1 : Dimensions of typical repair of pipeline.

Material

Property

Description

Steel

Glass/Epoxy

Adhesive

E1 E 2 E 3 ν 12 ν 13 ν 23

209000

159000 25400 25400

2400

Young's modulus in X direction (MPa) Young's modulus in Y direction (MPa) Young's modulus in Z direction (MPa)

0.3

0.28 0.28 0.15 7190 5430 5430

0.3

Poisson's Ratio in X-Y plan Poisson's Ratio in X-Z plan Poisson's Ratio in Y-Z plan

G 12 G 13 G 23

Shear modulus in X-Y plan (MPa) Shear modulus in X-Z plan (MPa) Shear modulus in Y-Z plan (MPa)

456000

Yield stress (MPa)

σ y

Table 2 : Mechanical proprieties of materials.

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