Fatigue Crack Growth in Life Prediction and Inspection Interval Determination

Authors
  1. Matthews, J.R.
  2. Barnes, G.B.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Royal Roads Military Coll, Victoria BC (CAN)
Abstract
Predictions of the service life and safe inspection intervals of components which fail by fatigue are normally calculated from equations which relate geometry to loading and data which relate fatigue stress intensities (delta K) to the fatigue crack propagation characteristics (da/dN). The fatigue crack growth data show considerable scatter and in these calculations are usually represented by the best fit in powers of fatigue stress intensity. A model suitable for computer analysis is proposed on the premise that the variability encountered in fatigue data is an inherent property of the material and not solely attributable to data gathering bias or scatter. Accordingly, the model allows for the determination not only of mean cycles but also of the confidence that one can have in the evaluated mean behaviour.
Report Number
DREP-LN-79-15 — Laboratory Note
Date of publication
15 Dec 1979
Number of Pages
25
DSTKIM No
81-00589
CANDIS No
31725
Format(s):
Hardcopy;Originator's fiche received by DSIS

Permanent link

Document 1 of 1

Date modified: