Issue 43

L.C.H. Ricardo, Frattura ed Integrità Strutturale, 43 (2018) 57-78; DOI: 10.3221/IGF-ESIS.43.04

SAE 0.25 mm SAE 0.50 mm SAE 0.75 mm SAE 1.0 mm

0 10 20 30 40 50 60 70 80 90

Crack Open Stress ( MPa)

2

3

4

5

6

7

8

9

10

Number of Cycles

Figure 13: Crack Opening Stress (σ yy+)

[70].

Figure 14 : Crack Closing Stress (σ yy- )

[70].

Surface Crack

Crack Tip  y= 103 MPa

Figure 15: Crack Opening Stress (σ yy+

) model SAE0.50 [70].

73