SYMPOSIA PAPER Published: 01 January 2000
STP14800S

Application of the Two-Parameter Description to Ductile Crack Growth

Source

Typical ASTM fracture testing determines the J-integral resistance (J-R) curve or fracture toughness (JIC) based on specimens with high-constraint geometry such as those specified in ASTM E 1737-96. A three-term asymptotic solution with two parameters, J and A2 (a constraint parameter), has been developed for characterizing the constraint effect of various geometries. The present paper extends the J-A2 characterization of a stationary crack tip to the regime of stable crack growth. Similar to the concept of J-controlled crack growth, theJ-A2 description can be approximately used to characterize ductile crack growth under certain amount of crack extension. The region ofJ-A2controlled crack growth is much larger than that controlled by theJ-integral alone. From the relationships between A2 and the test data, JIC, and tearing modulus, TR, the coefficients used to define a J-R curve can be determined. for non-standard specimens or actual structures, once the constraint parameter A2 is determined, the J-R curves appropriate for these geometries can then be obtained. A procedure of transferring J-R curves determined from the standard ASTM procedure to non-standard specimens or flawed structures is outlined in the paper.

Author Information

Chao, YJ
University of South Carolina, Columbia, SC
Zhu, XK
University of South Carolina, Columbia, SC
Lam, P-S
Westinghouse Savannah River Company, Aiken, SC
Louthan, MR
Westinghouse Savannah River Company, Aiken, SC
Iyer, NC
Westinghouse Savannah River Company, Aiken, SC
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Details
Developed by Committee: E08
Pages: 165–182
DOI: 10.1520/STP14800S
ISBN-EB: 978-0-8031-5437-7
ISBN-13: 978-0-8031-2868-2