Crack Paths 2012

O O P—area = 220 P m(crack depth 100 Pm)

1E1-E-1987210

'KIII/'KI,th,LC

Bearing Steel

(a)

GearSteel Railway Steel

N OG R O W T H

0.2

0.4

0.6

0.8

1 1.2 1.41.61.8 2

1E1-E-1987210

O O P—area = 630 P m(crack depth 200 Pm)

Bearing Steel

GearSteel Railway Steel

'KIII/'KI,th,LC

N OG R O W T H

0.2

0.4

0.6

0.8

1 1.2 1.4 1.61.8 2

(b)

Figure 5. Coplanar crack growth rate under out-of-phase fatigue tests. a) defect size

¥area = 220 Pm, b) defect size ¥area = 630 Pm.

A P P L I C A T I O NFM U L T I A X IFAALT I G UCERITERIA

Dang Van fatigue criterion

The basis of the Dang Van’s criterion is the application of the elastic shakedown

principles at the mesoscopic scale (more details can be found in [12, 13]). The Dang

Van’s criterion can be expressed by:

20