Issue 49

G. Meneghetti et alii, Frattura ed Integrità Strutturale, 49 (2019) 82-96; DOI: 10.3221/IGF-ESIS.49.09 93 Figure 14 : Specific heat flux distribution measured along the boundary of V c (R c =0.52 mm; a=11.66 mm;  K I,FE =35.4 MPa·m 0.5 , f L =35 Hz). C RACK PROPAGATION DATA RATIONALIZED IN TERMS OF EXPERIMENTAL J - INTEGRAL he crack propagation data shown in Fig. 8 have been reanalyzed in terms of experimental J-integral in Fig. 15, along with the mean curve, the 10-90% survival probability scatter band and the scatter index T da/dN . Considering that the fatigue tests were carried out by imposing a load ratio equal to -1 (R=-1), the  J was assumed equal to J max . The crack growth rates were synthesized in terms of  J evaluated by means of FE analyses in Fig. 16. It can be seen that numerical results are very well fitted by the 10-90% survival probability scatter band shown in Fig. 15. Figure 15 : Crack propagation rates versus the J-integral range evaluated from temperature measurements. -90 -112.5 -135 -157.5 180 157.5 135 112.5 90 67.5 45 22.5 0 -22.5 -67.5 -45 h [W/m 2 ] 10 10 2 10 3 10 4 10 5 ° ° ° ° ° ° ° ° ° ° ° ° ° ° ° da/dN [m/cycle] Experimental  J [J/m 2 ] 10 -8 10 -7 10 -6 10 -5 10 -4 T da/dN =4.41 10 2 10 3 10 4 10 5 10 6 AISI 304L R=-1 10% 90%  J from Eq.(18) T