Page 310 - Biaxial Multiaxial Fatigue and Fracture

294 2 FUKUDA AND H. NISITANI

U
c) Axial direction 60 p m
n= 1
2
3

-

10
(a) y,=O% (b) yg= 18%

Fig.6. The changes of surface state in the torsional test of S45C

c) Axial direction 60 u m

(a) y,=O% (b) yg= 18%
Fig.7. The changes of surface state in the torsional test of SC450

.U
- Axial direction 20 u m

(a) S45C (b) SC450

Fig.8. The local deformation in the static torsion test (SEM, y ,=18%)