ESDU 81012:2013
$62.40
Fatigue Threshold Stress Intensity Factors and Slow Crack Propagation Rates in Low and Medium Strength Low Alloy Steel
| Published By | Publication Date | Number of Pages |
| ESDU | 2013-01 | 24 |
Constant amplitude fatigue crack propagation rate (da/dN) data
are provided for a wide range of low and medium strength steels in
the form of plate and a forging. The ultimate tensile strength of
the materials is less than 850 MN/sq m and their thicknesses range
from 5 to 70 mm. The data have been derived from tests conducted in
laboratory air at room temperature and mean da/dN curves are
presented in terms of the stress intensity factor range and the
stress ratio, R. The materials are grouped according to four ranges
of their 0.2 per cent proof stress and where possible the upper
limit of scatter of the data is also provided. The range of da/dN
covered is from 10E-8 m/cycle down to the threshold at 2x10E-11
m/cycle. The effects of variations in mean stress, specimen size
and thickness, and material yield strength are discussed. Details
of all the materials and types of test specimen are tabulated and
summary da/dN curves that compare the different groups of materials
are given. Curves showing the effect of variations in the value of
R at threshold for the various materials are also presented. Simple
worked examples illustrate how the data may be used in
practice.
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