Development of a Low-Constraint SE(T) Toughness Test

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CANMET-MTL has developed a low-constraint test designed to reduce unnecessary conservatism in the measurement of toughness for use in the assessment of flaws in pipeline girth welds. The design is based on tension loading using fixed (clamped) grips of a single-edge-notched BxB SE(T) specimen, side-grooved to promote plane-strain conditions. Equations have been developed to derive J-integral, CTOD and crack growth from measurement of load and crack-mouth opening displacement. Loading conditions (essentially distance between the grips) have been chosen to reproduce the crack-tip constraint of a circumferential surface flaw in a pipe in service under tensile or bending loads. In this paper, the development of the test and the principal findings from its use will be described.

Info:

Periodical:

Key Engineering Materials (Volumes 488-489)

Edited by:

Z. Tonković and M.H. Aliabadi

Pages:

126-129

DOI:

10.4028/www.scientific.net/KEM.488-489.126

Citation:

W. R. Tyson et al., "Development of a Low-Constraint SE(T) Toughness Test", Key Engineering Materials, Vols. 488-489, pp. 126-129, 2012

Online since:

September 2011

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Price:

$35.00

[1] G. Shen, J.A. Gianetto and W.R. Tyson, Development of Procedure for Low-constraint Toughness Testing using a Single-Specimen Technique, MTL 2008-18(TR), Natural Resources Canada, Nov. (2008).

[2] G. Shen, J.A. Gianetto and W.R. Tyson, Measurement of J-R curves using single-specimen technique on clamped SE(T) specimens, Proc. 18th Int. Offshore and Polar Engineering Conf., Osaka, Japan, 21-26 June (2009).

[3] G. Shen, R. Bouchard, J.A. Gianetto and W.R. Tyson, Fracture Toughness Evaluation of High-strength Steel Pipe, PVP2008-61100, Proc. ASME PVP 2008 Conf., Chicago, July (2008).

DOI: 10.1115/pvp2008-61100

[4] G. Shen and W.R. Tyson, Crack size evaluation using unloading compliance in single-specimen single-edge-notched tension fracture toughness testing, Jour. of Testing and Evaluation Vol. 37 (4), paper ID JTE102368, ASTM (2009).

DOI: 10.1520/jte102368

[5] G. Shen and W.R. Tyson, Evaluation of CTOD from J-integral for SE(T) Specimens, Pipeline Technology Conference, Ostend, Belgium, 12-14 October (2009).

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