Paper Titles
Improvement in Strength of 2024 Al Alloy by Enhanced Solution Treatment
p.2362
Research on Dynamic Characteristics of Assembled Thin Plates Structure by BEM
p.2368
On the Study of Effective Breadth for Stiffened Plate under Flexible Support Condition
p.2375
Influence of Nitriding Treatment on Practical Properties of Eutectoid Steel
p.2382
The Charpy Notch Impact Test of X70 Pipeline Steel with Delamination Cracks
p.2391
Effects of Temperature and Loading Rate on Fracture Toughness
p.2397
Assessment of Geometry Independent Fracture Resistance Characteristics Based on Local Approach
p.2403
An Experimental Measurement of Toughness Locus for a Ductile Material
p.2410
The Effect of Sample Preparation upon the Fracture Toughness of Microsized TiAl
p.2416

The Charpy Notch Impact Test of X70 Pipeline Steel with Delamination Cracks

Article Preview

Abstract:

The effects of thickness, notch orientation and delamination cracks on the impact toughness of X70 pipeline steel are investigated experimentally by use of the instrumented Charpy impact tests at different temperatures. The couple effect of delamination cracks, thickness, notch orientation and temperature is discovered. The delamination cracks have certain direction, and their amount and size are related to the temperature and the specimen thickness. Though the delaminating orientations of T-S and T-L specimen are not same, the reasons for both T-S and T-L specimen delaminating are that the weak interfaces in the specimens are pulled apart by the stress perpendicular to them. The delamination cracks can improve the actual impact toughness of X70 pipeline steel both T-L and T-S specimens. The effect of delamination cracks on the actual impact toughness changes with the thickness and the temperature. The couple effect of wall thickness, defect orientation and working temperature of pipeline must be taken into account in safe assessment of pipeline.

You might also be interested in these eBooks
Advances in Fracture and Strength View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 297-300)

Pages:

2391-2396

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.297-300.2391

Citation:

Cite this paper

Online since:

November 2005

Authors:

Zheng Yang, Chun Yong Huo, Wanlin Guo

Keywords:

Delamination Crack, Instrumented Charpy Impact Test, X70 Pipeline Steel

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] J. R. Klepaczko: Crack Dynamics in Metallic Materials (Springer, 1990).

Google Scholar

[2] Z. Yang, W.L. Guo and H.R. Dong: ACTA METALLURGICA SINICA Vol. 39 (2003), p.159.

Google Scholar

[3] W.L. Guo, H.R. Dong and M.X. Lu: Inter. J. Pressure Vessels and Piping Vol. 79 (2002), p.403.

Google Scholar

[4] R.W. Hertzberg: Deformation and Fracture Mechanics of Engineering Materials (2nd Edition) (John Wiley & Sons, 1983).

Google Scholar

[5] GB/T 229-1994, Metallic materials-Charpy notch impact test (1994).

Google Scholar

[6] T. Premack and A. Douglas: Int. J. Solids Structure. Vol. 32 (1995), p.2793.

Google Scholar

[7] P. Landrein, T. Lorriot and L. Guillaumat: Engng. Fracture Mech. Vol. 68 (2001), p.1631.

Google Scholar