Digital Repository, ICF12, Ottawa 2009

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Assessment of Environmental Effect on the Closure-Free Threshold Stress Intensity Factor (SIF) Range
T. Meshii, M. Tsuji

Last modified: 2013-05-03


The applied stress intensity factor (SIF) range ΔK has been known to be a major
controlling parameter in fatigue crack growth (FCG) rate da/dN under small scale
yielding conditions [1]. Almost without exception, existing data show that the
threshold SIF range ΔKth tends to decrease with increasing load ratio R [2].
Schmidt and Paris rationalized this behavior solely on the basis of the crack
closure concept [3]. According to their model, the ΔKth obtained by the maximum
SIF (Kmax)-constant test method (that ensures closure free conditions) is expected
to be independent of Kmax and to be constant. However, this does not happen for
all the materials [2, 4, 5].

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