SYMPOSIA PAPER Published: 01 January 1990

Significance of Precracking Variables for Slow-Bend Charpy Tests


The significance of four variables in the technique used to precrack Charpy specimens of metallic materials is determined by analyses of seven responses computed from results of slow-bend tests. The variables include crack size, stress-intensity factor at the start of precracking, notch preparation prior to precracking, and material. All four variables are shown here to be significant for more than one of the computed responses. Seven response parameters, each representing alternative methods for evaluations of fracture toughness, were evaluated for each test. Responses are based either on a single value of load or energy absorbed in the test. The results indicate that (1) all seven computed responses are linearly related to crack length and the sensitivity to crack length is a function of both response parameter and material, and (2) precracking at either very high or very low levels of stress-intensity factor, Kf, are to be avoided. This work is the result of a study conducted by ASTM Task Group E-24.03.03 and members of eight participating laboratories.

Author Information

Interrante, CG
Filliben, JJ
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E28
Pages: 142–175
DOI: 10.1520/STP24144S
ISBN-EB: 978-0-8031-5132-1
ISBN-13: 978-0-8031-1295-7