ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 3

Plastic Rotation Factors of Three-Point Bend and Compact Tension Specimens

Wu, S-X
Graduate Student, Professor, and Reader, University of Sydney, Sydney, NSW

Mai, Y-W
Graduate Student, Professor, and Reader, University of Sydney, Sydney, NSW

Cotterell, B
Graduate Student, Professor, and Reader, University of Sydney, Sydney, NSW

(Received 30 November 1987; accepted 14 April 1988)

Abstract

Plastic rotation factors (r_p) for three-point bend and compact tension specimens were obtained for a range of normalized crack depths (a/W) from 0.25 to 0.88 and power law hardening materials. The theoretical slip-line field solutions were used for non-strain hardening materials (i.e., n = ∞) and the Kumar-German-Shih finite element plastic displacement solutions for strain hardening materials (i.e., n < ∞) in these r_p calculations. For crack depth a/W = 0.50, the factors r_p are approximately independent of strain hardening if n > 5 and are in reasonable agreement with those values recommended by ASTM Subcommittee E24.08 for calculation of crack tip opening displacements in these two types of specimens. For n ≤ 5 the error in r_p becomes appreciably large.

Keywords:
plastic rotation factor, crack tip opening displacement, slip-line, three-point bend specimen, compact tension specimen, strain hardening

Paper ID: JTE11276J
DOI: 10.1520/JTE11276J
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