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Applicability of a Deterministic Approach to Predict the Minimum Fracture Toughness in the DBTT Region From Tensile Test Results: Example for 0.5T SE(B) and 1TCT Specimens

[+] Author Affiliations
Toshiyuki Meshii, Yusuke Fujita, Teruhiro Yamaguchi

University of Fukui, Fukui, Japan

Paper No. PVP2016-63143, pp. V003T03A068; 6 pages
doi:10.1115/PVP2016-63143
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5039-8
  • Copyright © 2016 by ASME

abstract

Fracture toughness Jc of the material in ductile to brittle transition temperature region is known to have two specimen size effects; the planar size effect and the test specimen thickness effect. It was presented that these size effects can be solved by applying modified Richie-Knott-Rice failure criterion in previous research. As a next step, in this study, engineering method to predict the minimum Jc for a specimen type and thickness from only tensile test results is proposed. The method focused on our finding the crack-opening stress σ22, measured at a distance from the crack tip equal to four times the crack-tip opening displacement (CTOD) δt, denoted as σ22d, saturated with increasing load, and the J corresponding to the load first reaching this saturated σ22d, denoted as Js, seemed to predict the minimum toughness for a given specimen and material at a specific temperature. The method was validated for 0.5T SE(B) and 1TCT specimen. The material was 0.55% carbon steel JIS 0.55C, which was tested at master curve reference temperature.

Copyright © 2016 by ASME

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