SYMPOSIA PAPER Published: 01 January 1980
STP36975S

Effects of Specimen Geometry on the J -R Curve for ASTM A533B Steel

Source

Two experiments were performed with ASTM A533B steel to evaluate effects of compact specimen geometry on the JI versus crack growth resistance curve and evaluate validity limits for J-controlled crack growth. Side groove depth and crack length ratios were investigated with 1T compact tension specimens (1TCT) of HSST-02 plate. An investigation of thickness to ligament ratios over a broad range was conducted with 2T plan compact specimens using HSST-03 plate. All tests were performed at 150°C (302°F) using a computer-interactive unloading compliance test procedure.

Results showed that side grooves straightened the crack growth. With HSST-02 plate, total side groove depth of 20 percent is required to eliminate crack tunneling. With this steel, side grooves served to reduce JIc from nonside groove measurements and also resulted in less measurement variability. A change in slip mode from planar to cross-slip did not affect the tearing modulus measurement, which was shown to be insensitive to thickness to ligament ratios ranging from 0.63 to 3.89. The minimum ω required for J-controlled crack growth for this material was shown to be on the order of one when considering less than 6 percent crack extension.

Author Information

Vassilaros, MG
Fatigue and Fracture Branch, David W. Taylor Naval Ship Research and Development Center, Annapolis, Md.
Joyce, JA
U.S. Naval Academy, Annapolis, Md.
Gudas, JP
Fatigue and Fracture Branch, David W. Taylor Naval Ship Research and Development Center, Annapolis, Md.
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: 251–270
DOI: 10.1520/STP36975S
ISBN-EB: 978-0-8031-4770-6
ISBN-13: 978-0-8031-0363-4