... critical strain pipeline tensile property seismic integrity compression capacity stress-strain curve pipe strain distribution test pipe test data mpa dent-free pipe longitudinal strain distribution compression test Effects of Dent on Compression Capacity of Line Pipe and Seismic Integrity...

... ABSTRACT The influence of a pipe's internal pressure on the critical strain at rupture and on ductile crack propagation is investigated. Full-scale tensile tests and a finite-element analysis (FEA) were conducted, with and without internal pressure, using full-scale pipes with surface notches...

... behaviour, where the sand-fill resists the development of the buckles which results in a significantly less steep decline of the bending moment capacity compared to tubes without sand-fill. steel metals & mining contribution sand-filled tube ovalisation critical strain spirally mpa...

... of an experimental database coming from Eni's projects. internal pressure prediction analytical formulation uf 0 pipeline evaluation gresnigt mohareb line pipe csm application thickness midstream oil & gas critical strain axial load piping simulation formulation pipe imperfection piping...

... ABSTRACT Ductile crack initiation under large-scale yielding is more likely to happen under extreme loading with small flaws and tougher materials. This paper discusses the Stress Modified Critical Strain model, and its applications to pipelines subjected to severe loading such as due...

... critical strain gauge length material property compressive strain capacity pipe sample ht girth weld piping simulation wall thickness upstream oil & gas piping design equation strength coupon strain capacity test result stress-strain curve Compressive Strain Limits of Large Diameter...

... more and more equal to the SAT material, even if the curve indicates a much higher critical strain. The critical strain may be predicted to be the stage in the CTOD-strain curve where the curve shifts to a rapidly increasing curve. For the reeling case with 3 x 50 mm defect this occurs at about 3...

... in tubes loaded in bending and normal force. The factors that are responsible for the large scatter in the critical strain are discussed. An overview is given of the design rules in various standards for structures such as the Eurocode 3 (EN 1993) and other standards. It appears that the various standards...

... Edge Notched Tension (SENT) tests are also investigated. A R-curve from SENT tests shows good agreement with that from pipe tests. Therefore, it is possible to use the R-curve of a SENT specimen as that of a pressurized pipe specimen. According to these results, the critical strain on ductile crack...

... carried out on the static-dynamic triaxial test system, with strain rates ranging from 10-5/s to 10-2/s. It is found that the compressive strength and the initial elastic modulus increase but the critical strain of concrete decreases with increasing strain rate. The linear-logarithmic experimental...

... pipes were employed for the FEA. Critical tensile strains and critical bending strains are also discussed. The following results were secured from our study: FEA without geometric imperfections tends to overestimate the critical strains. Geometric imperfections of wall thickness and pipe diameter should...

...; Compressive; Critical Strain; Bending Moment. INTRODUCTION Buried pipelines are subject to a number of loading conditions. These include internal pressure caused by the action of the fluids they convey, axial forces induced by thermal effects, and bending caused by differential soil movements. Recently...

... and a pure bending moment is applied at the left end. A 4% thickness reduction is created in the symmetry plane to initiate the buckling for all the cases. RESULTS Average Compressive Strain and Critical Strain Compressive strain is usually used to measure buckling resistance. The average compressive strain...

.... It appears that the manufacturing method (seamless, UOE) has a considerable influence on the critical buckling strain. These were compared with available prediction formulae for the bending moment capacity and the critical strain. Statistical and probabilistic evaluations were carried out to determine...

.... The rationale for this simplified analysis is based on reported investigation results, both theoretical and experimental, for buckling of pipes subjected to pure bending. This analysis indicates that the critical strain under the combined loading can be considerably greater than under pure bending only...

... that for the fire protected steel, the thermal insulation material ductility criterion is used and for the un- protected steel the steel ductility criterion is used. The critical strain for steel is about 20% and the critical strain for thermal insulation material used at 'Sleipner A' topside is about 6...