Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
Application of D. C. Electrical Potential Method for Measurement of J-R Curve by a Single Specimen
Tsuneo KODAIRAMasakatsu MATSUMOTONobuya NAKAJIMA
Author information
JOURNALS FREE ACCESS

1982 Volume 68 Issue 8 Pages 1040-1045

Details
Abstract

The fracture toughness tests at temperatures from -60°C to 100°C are conducted to develop the new method for the generation of the fracture resistance curve (J-R curve) by a single specimen. The three-point bend specimens with several configurations made of four kinds of nuclear reactor pressure vessel steels are used and the crack extention is measured by the d. c. electrical potential method during testing. From the results obtained, the following conclusions can be drawn:
(1) The relation between the potential difference (V0V)/V0 and the ratio of crack extention (a0a)/a0 is a very little bit scattered regardless of the specimen size, type of steels or testing temperatures, when the specimen configurations are kept as the similar figure. Where, a0, Δa, V0 and ΔV respectively denote the initial crack length, the amount of crack extention, the initial potential and the amount of potential difference. This relation is named here as the master curve.
(2) Then, the J-Δa relation (J-R curve) can be developed using the load-deflection record by a single specimen through the above mentioned master curve.

Information related to the author
© The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top