Quasi-static fracture toughness testing of a single CT specimen at two test conditions
Authors: Sasikala, G.; Ray, S. K.
Source: Materials Science and Technology, Volume 20, Number 5, May 2004 , pp. 623-626(4)
Publisher: Maney Publishing
Abstract:It is proposed that a single CT specimen can be used for determining J0.2 at two testing conditions, provided it can be ensured that the crack tip plastic zones for the two tests do not interfere. This is achieved by extending the crack at the end of the first fracture test by fatigue cycling at ambient temperature to obtain the starting crack for the second test. This method has been validated by testing thermally aged CT specimens of modified 9Cr - 1Mo steel at 653 K and 803 K. The J-Δa values obtained by a multispecimen method at a specific temperature were on a single curve irrespective of whether the data were generated from the first test or second test on that sample. Also, the J-Δa curves obtained using a single specimen normalisation method from data on first and second tests were within the expected specimen to specimen variation.
Document Type: Research Article
Affiliations: Materials Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
Publication date: 2004-05-01
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