Issue 35

S. Xinhong et alii, Frattura ed Integrità Strutturale, 35 (2016) 441-448; DOI: 10.3221/IGF-ESIS.35.50

A

 ACD = 83°

D

C

B

0.5mm

(a) (b) (c)

,  x m

,  x a =185 MPa: (a) fracture surface, (b) measurement of crack initiation and early

Figure 4 : Tension-torsion fatigue for

=0MPa,

propagation plane orientation, (c) stress element.

A

 ACD = 75°

D

C

0.5mm

B

(a) (b) (c)

,  x m

,  x a =185 MPa: (a) fracture surface, (b) measurement of crack initiation and early

=50MPa,

Figure 5 : Tension-torsion fatigue for

propagation plane orientation, and (c) stress element.

A

 ACD = 7°

D

C

0.5mm

B

(a) (b) (c)

,  x m

,  x a =180 MPa: (a) fracture surface, (b) measurement of crack initiation and

Figure 6 : Tension-torsion fatigue for

=100MPa,

early propagation plane orientation, and (c) stress element.

A

 ACD = 9°

D

C

B

0.5mm

(a) (b) (c)

,  x m

,  x a =140 MPa: (a) fracture surface, (b) measurement of crack initiation and

Figure 7 : Tension-torsion fatigue for

=150MPa,

early propagation plane orientation, and (c) stress element.

445