THE NON-CONSTANT CTOD/CTOA IN CRACK PROPAGATION

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Unlike the common belief that crack propagation behavior can be predicted successfully by employing fracture criteria based on a constant crack tip opening displacement or angle (CTOD/CTOA), this paper shows that the initially non-constant portion of the CTOD/CTOA plays an essential role in predicting the fracture load for a growing crack. Three- and two-dimensional finite element analyses indicate that a severe underestimate of the experimental load vs. crack extension curve would occur if a constant CTOD/CTOA criterion is used. However, the use of a simplified, bilinear CTOD/CTOA criterion including its non-constant portion will closely duplicate the test data. Furthermore, as ... continued below

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LAM, POH-SANG July 19, 2004.

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Unlike the common belief that crack propagation behavior can be predicted successfully by employing fracture criteria based on a constant crack tip opening displacement or angle (CTOD/CTOA), this paper shows that the initially non-constant portion of the CTOD/CTOA plays an essential role in predicting the fracture load for a growing crack. Three- and two-dimensional finite element analyses indicate that a severe underestimate of the experimental load vs. crack extension curve would occur if a constant CTOD/CTOA criterion is used. However, the use of a simplified, bilinear CTOD/CTOA criterion including its non-constant portion will closely duplicate the test data. Furthermore, as a result of using the experimental data from J-integral test with various crack length to specimen width ratios (a/W), it is demonstrated that the CTOD/CTOA is crack tip constraint dependent. The initially higher values of the CTOD/CTOA are in fact a natural consequence of crack growth process which is refl ected by the J-resistance curve and its slope (tearing modulus).

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  • Journal Name: Journal of the Mechanics and Physics of Solids

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  • Report No.: WSRC-MS-2004-00532
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 829694
  • Archival Resource Key: ark:/67531/metadc787592

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  • July 19, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 5, 2016, 2:12 p.m.

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LAM, POH-SANG. THE NON-CONSTANT CTOD/CTOA IN CRACK PROPAGATION, article, July 19, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc787592/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.