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Fig. 9. Fatigue lifetime curves depicting predicted cycles to fracture as a
function of percent of breaking strength. Blue curves are calculated from
parameters for all data for a given species (`All' in
Table 3), green curves are
determined from parameters for all algal data combined (`Overall' in
Table 3), red curve is for the
upper-bound parameters for M. flaccida (`Upper Bound' in
Table 3), and gray curve is for
U. expansa parameters determined excluding an outlying data point
(`Excluding Outlier' in Table
3). Broken portions of curves are below measured fatigue
thresholds, To, for which no crack growth is predicted. An
approximate time to failure is given on the secondary ordinate. As described
in the text, time to failure is calculated assuming that each wave has a
period of 10 s and that approximately 1 in 20 waves imposes stresses great
enough to cause fatigue damage.
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