Forces and strains during drop weight tear test

As follows from the results of drop weight tear tests (DWTT), modern strength class K65 steels for gas-main pipelines exhibit an almost 100% fraction of ductile component in a fracture surface. The results of ground tests demonstrate that the lengths of extended fracture of a pipe made of such steel...

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Bibliographic Details
Published in:Russian metallurgy Metally 2017-04, Vol.2017 (4), p.339-349
Main Authors: Shtremel’, M. A., Arabei, A. B., Glebov, A. G., Abakumov, A. I., Esiev, T. S., Struin, A. O., Sarychev, B. A.
Format: Article
Language:English
Subjects:
Alloys
Chemistry and Materials Science
Crack propagation
Diagnostics and Mechanical Test Techniques
Drop tests
Ductile fracture
Gas pipelines
Ground tests
Kinematics
Materials Science
Metallic Materials
Natural gas
Pipes
Suppliers
Tear tests
Tearing
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Summary:As follows from the results of drop weight tear tests (DWTT), modern strength class K65 steels for gas-main pipelines exhibit an almost 100% fraction of ductile component in a fracture surface. The results of ground tests demonstrate that the lengths of extended fracture of a pipe made of such steels from different suppliers are substantially different. The possibility of extracting other characteristics from DWTT tests of full-thickness notched specimens and the information content in them are estimated. High-speed detection of the strain and crack growth is performed during static and dynamic loading. As follows from an analysis of fracture kinematics and force and energy balance, fracture is a multistage process, where mechanisms change during crack growth.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S0036029517040218