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Automatic near-threshold fatigue crack growth rate measurements at liquid helium temperature

Authors
Journal
International Journal of Fatigue
0142-1123
Publisher
Elsevier
Publication Date
Volume
7
Issue
4
Identifiers
DOI: 10.1016/0142-1123(85)90050-7
Keywords
  • Fatigue
  • Low Temperature
  • Cryogenic Equipment
  • Computerized Control
  • Fatigue Crack Growth Rates
  • Threshold Stress Intensity Factors
  • Austenitic Steels

Abstract

Abstract The development of a fully automated test apparatus for near-threshold fatigue crack growth rate measurements in a liquid helium environment is described, and some initial results for AISI 300 series stainless steels are presented. The experimental apparatus consists of a servohydraulic test machine and a cryostat, complete with a minicomputer, a programmable arbituary waveform generator, a programmable digital oscilloscope and a fully automatic liquid helium refill system. The technique uses 6.4 mm thick compact specimens subjected to systematically decreasing loads, with 24 h operation at 40 Hz, the crack growth being continuously monitored by specimen compliance measurements. The results presented in this study include da/ dN vs ΔK curves and threshold fatigue stress intensity factors, ΔK th , at 4 K for AISI 304L, 304LN and 316 stainless steels. The near-threshold fatigue behaviours of these materials are similar, and the fatigue crack growth rate trends at intermediate ΔK levels nearly agree with published results.

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