SYMPOSIA PAPER Published: 01 January 1991
STP16848S

Specimen Size Requirements for Elastic-Plastic Crack Growth Resistance Curves

Source

This paper presents the results of an experimental program to study size and geometry effects in CTOD R-curves. The results were obtained from room temperature unloading compliance R-curve tests on different sized single-edge-notch bend (SENB) specimens made from HY100 steel. The crack growth resistance was measured in terms of conventional CTOD, δo, (that is, as defined in BS 5762), CTOD corrected for crack growth, δR, and CTOD derived using a double clip gage arrangement δdc. It was found that all the CTOD R-curves exhibited upswings after crack extensions corresponding to approximately 17% of the initial uncracked ligament. Moreover, the slope of the CTOD R-curve increased dramatically after crack extensions corresponding to approximately 45% of the initial ligament. Apart from the R-curves obtained from the smaller specimens, normalizing the crack growth axis by dividing the crack extension by the initial ligament resulted in normalized CTOD R-curves which were in reasonable agreement over the entire crack growth range studied (that is, 60% of the initial uncracked ligament).

Author Information

Gordon, JR
Edison Welding Institute, Columbus, OH
Jones, RL
U.K. Admiralty Research Establishment, Holton Heath, Poole, United Kingdom
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 81–101
DOI: 10.1520/STP16848S
ISBN-EB: 978-0-8031-5172-7
ISBN-13: 978-0-8031-1418-0