Elastic and Elastic-Plastic Fracture Toughness

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Authors
  1. KarisAllen, K.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Facts Engineering Inc, Halifax NS (CAN)
Abstract
Material temperature transition curves are a necessary requirement for the understanding of the response of structures exposed to various temperatures, loading rates, and stress states. DREA has relied heavily on ASTM standard E-604 to produce transition information for steels and weldments of relevance to the Canadian Navy. This report focuses on the relationship between ASTM E-604 transition curves and quantitative elastic and elastic-plastic fracture properties, namely, K and J-integral, respectively. The materials evaluated include marine steel plates and weldments with varuing flow properties, including Lloyds Grade A plate, CSA G40.21 350WT, and ASTM A517. A comparison of the ASTM E-604 transition temperature and the transition temperature for specimens tested at aqusistatic loading rates indicates a significant shift to lower transition temperatures for the quasistatic specimens. This shift was attributed to the difference in applied loading rates between the two tests. Elastic and elastic-plastic analyses of the 350WT and A517 test samples indicate that as the temperature decreases, the failure mechanism changes from ductile stable limit load tearing to brittle unstable crack propagation. There was no temperature interval for the materials in the thicknesses tested where crack initiation was governed by either K or J as defined by ASTM E-399 and ASTM E-813, respectively. TRUNCATED
Keywords
350 WT Steel;A517 steel;Elastic Fracture Toughness;Elastic Plastic Fracture;Elastic Plastic Fracture Toughness;Transition Curves;Grade A steel;JIc;Kic;ASTM E604;ASTM E399;ASTM E813
Report Number
DREA-CR-1999-065 — Contractor Report
Date of publication
01 Apr 1999
Number of Pages
99
DSTKIM No
99-01793
CANDIS No
511655
Format(s):
Hardcopy;Document Image stored on Optical Disk

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