ISSN:
1460-2695
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Maschinenbau
Notizen:
Quantitative predictions of the influence of yield strength and stress ratio, R, on the physically small crack fatigue threshold stress intensity, ΔK0(s), are presented. It is shown that at R= 0 to -1, although the threshold stress Δs̀0 increases, the threshold stress intensity, ΔK0(s), decreases with increasing yield strength. Moreover, a lower bound value, ΔK0(s)(min) is shown to have a constant value, irrespective of the strength and stress ratio. For a given strength, ΔK0(s), decreases with increasing R in the range -1〈inlineGraphic alt="leqslant R: less-than-or-eq, slant" extraInfo="nonStandardEntity" href="urn:x-wiley:8756758X:FFE419:les" location="les.gif"/〉R〈inlineGraphic alt="leqslant R: less-than-or-eq, slant" extraInfo="nonStandardEntity" href="urn:x-wiley:8756758X:FFE419:les" location="les.gif"/〉0.6 and attains a constant low value for R 〉 0.6. Predicted values of ΔK0(s) are in good agreement with experimental data for steels. The formation and length of non-propagating fatigue cracks, anp, are also discussed. The methods suggested for estimating ΔK0(s) and anp may be found useful in design procedures.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1460-2695.1993.tb00097.x
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