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Characterization and Calculation of Fracture Toughness for High Grade Pipes Open Access


Other title
high grade pipes
fracture toughness
Type of item
Degree grantor
University of Alberta
Author or creator
student, Cen Cheng
Supervisor and department
Chongqing Ru, Department of Mechanical Engineering
Examining committee member and department
Dongyang Li, Department of Chemical and Materials Engineering
Chongqing Ru, Department of Mechanical Engineering
Zihui Xia, Department of Mechanical Engineering
Department of Mechanical Engineering

Date accepted
Graduation date
Master of Science
Degree level
The classical Battelle two-curve method is proved to be non-conservative in calculating the arrest fracture toughness of high grade line pipes. In this thesis, first, the concept of ―limit (crack) speed‖ is introduced to the existing two-curve method, which leads to a modified two-curve method (LS-TCM) that could give more accurate calculation of fracture toughness in some cases for both low and high grade pipes. Several other new ideas and approaches are also proposed to calculate fracture toughness of all grade pipes, and their applicability for high grade pipes is discussed with comparison to available known data. Some comments are given about how to choose an appropriate formula to calculate fracture toughness for high grade pipes. Finally, the relationship between the three basic parameters for characterizing fracture toughness, CVN, DWTT and CTOA, is also discussed, in order to give designers helpful advice about how to choose the parameters to characterize fracture toughness of line pipes.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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