Page 113 - Biaxial Multiaxial Fatigue and Fracture

98 L. SWSMEL AND A! PETRONE

P25BT5 - Nf,Z%= 31000 Cycles P26BTS - Nf,x = 64090 Cycles
7
?$
J Ls

P23BT4 - Nf,x = 132215 Cycles

I

rr

P27BT6 - Nf,s = 232370 Cycles m .
by

rl

Fig. 11. Cracks pattern at 20% stiffness drop on the bidimensional development of the specimen
gauge surface: in-phase bendinghorsion tests (h=~~~,Ju~,~<l, 6~~0').