RESEARCH PAPERS: Offshore Mechanics and Arctic Engineering

Safety Assessment of Steels and Welds Under Cyclic and Monotonic Loadings at Low Temperatures

[+] Author and Article Information
N. Urabe, A. Yoshitake, H. Kagawa

Technical Research Center, Nippon Kokan K.K., Kawasaki-city, Japan

J. Energy Resour. Technol 106(4), 473-479 (Dec 01, 1984) (7 pages) doi:10.1115/1.3231110 History: Received June 27, 1983; Revised January 13, 1984; Online October 22, 2009


In order to investigate the mechanisms and the factors to govern the brittle fracture initiation during the fatigue crack propagation at low temperatures, fracture toughness tests under wide range of loading rates, fatigue tests at low temperatures and fracture toughness tests after having been given pre-loading were performed on steels and weld junctions. The fatigue fracture toughness K fc was estimated as equivalent as the fracture toughness K c under the monotonic tensile loading if they were compared at the same loading rate, since the residual stress due to the cyclic loading was less effective on the brittle fracture initiation. The calculated fatigue life based on Paris’s formula taken into consideration of the crack closure phenomena showed a good one-by-one agreement with the observed fatigue life up to the brittle fracture initiation. Therefore, a design curve was preliminarily drawn to determine the fatigue life at low temperatures.

Copyright © 1984 by ASME
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