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Title: Effects of strain rate on strength, and of orientation on toughness, of modern high-strength pipe steels
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Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2359s
Date of Publication: 2015-09-01
Price: $25.00 US
Authors: Dr Su Xu, and Dr William R Tyson
Abstract: TENSILE PROPERTIES (stress-strain curves) including the effects of strain rate and temperature, as well as fracture- resistance curves, are required for the advanced engineering-critical assessment (ECA) of imperfections discovered during pipeline construction or service, and for modelling dynamic fractures. However, these fundamental mechanical properties do not appear to be widely available for modern high-strength pipe steels. In this experimental investigation, seven modern high-strength pipe steels – including X- 70, X-80, X-100, and X-120 grades – were tested. Tensile tests were performed using cylindrical specimens over a range of strain rates (0.00075 to 1 s-1) and temperatures (23° to -150°C). For ferritic steels, the thermal component of flow strength ?? = ? - ?0 (where ?0 is the flow stress at room temperature and quasi-static rate) follows a ‘master curve’ constitutive equation.

Standard Charpy absorbed energies, and J- resistance and crack-tip-opening displacement (CTOD) resistance curves using single-edge bend, SE(B), specimens, were determined with different specimen orientations. The initiation fracture toughness values (J0.2mm and CTOD0.2mm) were also determined. Generally, the toughness was higher for longitudinal than for transverse specimens for the same notch configuration, and for surface-notched than for through- thickness-notched specimens for the same specimen orientation. These results provide a historical perspective on trends in the evolution of strength and toughness.

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