The objective of this research program was to determine the effect of various backfill types on ductile fracture behavior by a relative comparison of fracture behaviors in model pipes. Model pipes of 6.0-inch outside diameter were selected because…
Nine full-scale experimental burst tests have been conducted by the participants in the Alaskan and Canadian segments of the ANGTS. These tests were conducted at the British Gas Test Facility, Spadeadam, England, and the Northern Alberta Burst Test…
The objective of this study is to determine the decompression characteristics of the nitrogen and water combined pressuring medium used in the West Jefferson type experiments to establish the validity of these experiments for evaluating shear…
This study was undertaken with the objective of comparing, where possible, the experimentally obtained propagation pressures from a study at U.T. and a similar study carded out between 1973 and 1978 by Battelle researchers. Results from the latter…
The objective of this research program was to obtain an understanding of fracture initiation and propagation in an underwater pipeline. A single experiment was conducted using a modified West Jefferson test consisting of a "test" vessel inside a…
This report presents a methodology that determines the lowest temperature where ductile fracture would occur for either sharp cracks or blunt corrosion flaws in older low-toughness line pipe base metals. It is applicable to either axial or…
NIST work developed processes to identify the stress/strain/crack velocity conditions for unstable high-rate ductile crack propagation found in a full-scale pipeline burst test and duplicate those conditions in a medium-scale test. With modeling to…
The evaluation of toughness of line-pipe steels to avoid ductile fracture initiation and unstable ductile fracture propagation is presently being evaluated empirically by using impact toughness data. Empirical correlations from full-scale testing…