Fig. 10. Fatigue lifetime curves depicting predicted cycles to fracture as a function of cyclic stress for M. flaccida. Broken portions of curves are below measured fatigue threshold, T_o, for which no crack growth is predicted. Color-coding of curves is as described for Fig. 9. Approximate water velocities corresponding to applied stresses are given on the secondary abscissa. Estimated time to failure, determined as described in the text, is given on the secondary ordinate.