Fig. 19.7 Crack observed in a pre-fatigued specimen of NP ¼20,000 0.0E+00 1.0E-05 2.0E-05 3.0E-05 4.0E-05 5.0E-05 11.0 11.5 12.0 12.5 13.0 13.5 Mean strain rate, dεxy /dt[/s] Tensile load, F [kN] 0 10 100 1000 10000 20000 Pre-fatigue cycles Fig. 19.8 Mean strain rate dεxy/dt plotted against the applied tensile load 2730 2780 2830 2880 1 10 100 1000 10000 100000 Surface wave velocity [m/s] Number of cycles Non fatigued 2730 2780 2830 2880 1 10 100 1000 10000 100000 Surface wave velocity [m/s] Number of cycles Non fatigued Direction y a b Direction x Fig. 19.9 SAW velocity on the surface of pre-fatigued specimen in (a) tensile direction, y, and (b) vertical direction to the tensile direction, x
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