SYMPOSIA PAPER Published: 01 January 1983
STP37094S

A Perspective on R-Curves and Instability Theory

Source

Several aspects of elastic-plastic R-curve theory and instability analysis are discussed. It is shown how material flow property effects can be incorporated into the R-curve in place of the more common practice of incorporation into J crack drive. Formulas for deformation theory J that adjust for slow-stable crack growth in compact (CT) and center cracked tension (CCT) specimens are presented. For cases of extremely large crack extension where conditions of deformation theory J are violated, an expression for modified J also is presented. JR-curve data obtained from a 4T size compact specimen were used to predict instability in a displacement controlled CCT test for 2024-T351 aluminum.

Author Information

McCabe, DE
Westinghouse Research and Development Center, Pittsburgh, Pa.
Ernst, HA
Westinghouse Research and Development Center, Pittsburgh, Pa.
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Details
Developed by Committee: E08
Pages: 561–584
DOI: 10.1520/STP37094S
ISBN-EB: 978-0-8031-4857-4
ISBN-13: 978-0-8031-0728-1