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Technical Briefs

Evaluation on an Internal Surface Crack in a Compound Tube

[+] Author and Article Information
A. A. Ali, A. Khinani, A. Z. Rashid, F. Tarlochan

Department of Mechanical Engineering, Universiti Tenaga Nasional, Km 7 Jalan Kajang-Puchong, 43009 Kajang Selangor, Malaysia

J. Purbolaksono1

Department of Mechanical Engineering, Universiti Tenaga Nasional, Km 7 Jalan Kajang-Puchong, 43009 Kajang Selangor, Malaysiajudha@uniten.edu.my

1

Corresponding author.

J. Pressure Vessel Technol 131(6), 064501 (Oct 28, 2009) (4 pages) doi:10.1115/1.4000346 History: Received October 01, 2008; Revised June 10, 2009; Published October 28, 2009

In this paper stress intensity factors of a longitudinal semielliptical surface crack on the inner surface in a compound tube subjected to internal pressure are presented. Variations of modulus of elasticity and thickness for the inner part of the tube are used in order to evaluate their effects on the normalized stress intensity factors. The boundary element method is used to analyze the problems. The increasing of thickness of the inner region causes decreasing values of the normalized stress intensity factor, as the modulus of elasticity for the inner part is greater than that of the outer part. Conversely, if the modulus of elasticity for the inner region is smaller, the increasing of thickness of the inner part would give increasing values of the normalized stress intensity factor. A larger inner radius and smaller thickness of the tube gives a higher normalized stress intensity factor.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 1

Illustration for the studied model of a longitudinal semielliptical crack on the inner surface of a composite structure of tube

Grahic Jump Location
Figure 2

Comparison of the SIF values for longitudinal semielliptical crack on inner surface of tube obtained by using BEASY (9) and by Mettu (2) (a/c=1; a=0.5 mm; Tube 2 as shown in Table 1)

Grahic Jump Location
Figure 3

The normalized stress intensity factors (KI/K0) for crack depth of 0.5 mm with different values of modulus of elasticity and different thickness of the inner part

Grahic Jump Location
Figure 4

Comparison of the normalized SIF values for a longitudinal semielliptical crack on the inner surface of the tube with different thickness of the inner part obtained using BEASY (9) (Einner=175,000 MPa; Eouter=163,410 MPa; Tube 2 as shown in Table 1)

Grahic Jump Location
Figure 5

Comparison of the normalized SIF values for a longitudinal semielliptical crack on the inner surface of the tube with different thickness of the inner part obtained using BEASY (9) (Einner=150,000 MPa; Eouter=163,410 MPa; Tube 2 as shown in Table 1)

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