SYMPOSIA PAPER Published: 01 January 1986

Dynamic Curve Testing of a High Strength Steel Using the Key Curve and Multispecimen Techniques


J-integral R-curve tests were performed on three-point bend specimens of a 3-Ni steel at three loading rates: quasi-static, intermediate (25 mm/s), and drop tower (2.54 m/s). The key curve and multispecimen procedures were employed for the higher rate tests; this investigation is focused primarily on details of the test method development. The multispecimen and key curve techniques were found to yield upper shelf J-R curves which were in substantial agreement at the elevated loading rates. Numerical smoothing techniques required to apply a key curve method appear to separate the oscillatory high frequency component from the load-displacement record. For the 3-Ni steel tested for this investigation both JIc and T were found to be elevated with increasing loading rate.

Author Information

Joyce, JA
U.S. Naval Academy, Annapolis, MD
Hackett, EM
David Taylor Naval Ship Research and Development Center, Bethesda, MD
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Developed by Committee: E08
Pages: 741–774
DOI: 10.1520/STP17426S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3