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An experimental assessment of hysteresis in near-threshold fatigue crack propagation regime of a low alloy ferritic steel under closure-free testing conditions

Technical Report:

Abstract

Near-threshold fatigue crack propagation behavior of a high strength steel was investigated in laboratory air under closure-free testing conditions at R = 0.7 (= R{sub eff}), and at two different K-gradients. Depending on the criterion assumed, the threshold value differed; the criterion of non-propagation gave a lower threshold value than that assumed by the propagation criterion. Nevertheless, the subsequent propagation following a load increase was discontinuous in both the cases, and da/dN vs {Delta}K curves obtained on the same specimen during the K-decreasing and the K-increasing test were not necessarily identical in the threshold regime. This behavior, hysteresis, is analyzed mainly from the experimental viewpoint, and it is shown that hysteresis is not an artifact. (orig.) With 13 figs., 3 appendices. [Deutsch] Das Rissausbreitungsverhalten eines hochfesten Stahls wurde in Laborluft untersucht, und zwar bei zwei unterschiedlichen Lastabstufungsraten und einem Lastverhaeltnis von R = 0,7 (= R{sub eff}), ohne dass Rissschliessung auftrat. Abhaengig von dem angenommenen Kriterium variierte der Schwellwert. Das Kriterium `keine Rissausbreitung` (non-propagation) ergab einen niedrigeren Schwellwert als das Kriterium `Rissausbreitung` (propagation). Dennoch war die an die Lasterhoehung anschliessende Rissausbreitung in den beiden Faellen diskontinuierlich, und demzufolge waren die an derselben Probe waehrend der Lastabstufung und nach der Lasterhoehung  More>>
Authors:
Vaidya, W V [1] 
  1. GKSS-Forschungszentrum Geesthacht GmbH, Geesthacht-Tesperhude (Germany). Inst. fuer Werkstofforschung
Publication Date:
Dec 31, 1991
Product Type:
Technical Report
Report Number:
GKSS-91/E/28
Reference Number:
SCA: 360103; PA: DEN-92:000982; SN: 92000657217
Resource Relation:
Other Information: PBD: 1991
Subject:
36 MATERIALS SCIENCE; FERRITIC STEELS; CRACK PROPAGATION; FATIGUE; HYSTERESIS; 360103; MECHANICAL PROPERTIES
OSTI ID:
10115855
Research Organizations:
GKSS-Forschungszentrum Geesthacht GmbH, Geesthacht-Tesperhude (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE92766333; TRN: DE9200982
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
36 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Vaidya, W V. An experimental assessment of hysteresis in near-threshold fatigue crack propagation regime of a low alloy ferritic steel under closure-free testing conditions. Germany: N. p., 1991. Web.
Vaidya, W V. An experimental assessment of hysteresis in near-threshold fatigue crack propagation regime of a low alloy ferritic steel under closure-free testing conditions. Germany.
Vaidya, W V. 1991. "An experimental assessment of hysteresis in near-threshold fatigue crack propagation regime of a low alloy ferritic steel under closure-free testing conditions." Germany.
@misc{etde_10115855,
title = {An experimental assessment of hysteresis in near-threshold fatigue crack propagation regime of a low alloy ferritic steel under closure-free testing conditions}
author = {Vaidya, W V}
abstractNote = {Near-threshold fatigue crack propagation behavior of a high strength steel was investigated in laboratory air under closure-free testing conditions at R = 0.7 (= R{sub eff}), and at two different K-gradients. Depending on the criterion assumed, the threshold value differed; the criterion of non-propagation gave a lower threshold value than that assumed by the propagation criterion. Nevertheless, the subsequent propagation following a load increase was discontinuous in both the cases, and da/dN vs {Delta}K curves obtained on the same specimen during the K-decreasing and the K-increasing test were not necessarily identical in the threshold regime. This behavior, hysteresis, is analyzed mainly from the experimental viewpoint, and it is shown that hysteresis is not an artifact. (orig.) With 13 figs., 3 appendices. [Deutsch] Das Rissausbreitungsverhalten eines hochfesten Stahls wurde in Laborluft untersucht, und zwar bei zwei unterschiedlichen Lastabstufungsraten und einem Lastverhaeltnis von R = 0,7 (= R{sub eff}), ohne dass Rissschliessung auftrat. Abhaengig von dem angenommenen Kriterium variierte der Schwellwert. Das Kriterium `keine Rissausbreitung` (non-propagation) ergab einen niedrigeren Schwellwert als das Kriterium `Rissausbreitung` (propagation). Dennoch war die an die Lasterhoehung anschliessende Rissausbreitung in den beiden Faellen diskontinuierlich, und demzufolge waren die an derselben Probe waehrend der Lastabstufung und nach der Lasterhoehung erhaltenen da/dN-{Delta}K-Kurven im Schwellwertbereich nicht unbedingt deckungsgleich. Dieser Effekt, Hysterese, wird hauptsaechlich von experimentellen Gesichtspunkten aus analysiert, und es wird gezeigt, dass der Hysterese-Effekt kein Artifakt ist. (orig.) With 13 figs., 3 appendices.}
place = {Germany}
year = {1991}
month = {Dec}
}