ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 6

A Modified Normalization Method for Developing J-R and CTOD-R Curves with the LMN Function

Fortes, CJFO
Senior researcher and professor, COPPE/Federal University of Rio de Janeiro, Rio de Janeiro (RJ),

Bastian, FL
Senior researcher and professor, COPPE/Federal University of Rio de Janeiro, Rio de Janeiro (RJ),

(Received 18 March 1995; accepted 1 November 1996)

Abstract

A direct method for obtaining J-R curves and δ-R curves from load-crack mouth opening displacement data is proposed. The method uses the direct method proposed by Landes, Herrera, Zhou, and Lee, based on the geometric normalization suggested by Ernst for deeply cracked bend specimens, to develop calibration curves that relate load, crack mouth opening displacement, and crack length. Given two of these parameters, the third can be calculated from the calibration curves. These curves are developed by assuming a power law plus a straight line functional form with unknown L, M, and N constants and evaluating the unknowns at three calibration points in the test. The method is studied for a HY-80 steel for four test temperatures and 50 mm-width, 25 mm-thickness side-notched single-edge bend specimens.

Keywords:
elastic-plastic fracture, J-integral, fracture toughness, J-R curve, δ-R curve, key curve, normalization method, LMN Function, HY-80 steel

Paper ID: JTE11342J
DOI: 10.1520/JTE11342J
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