Issue 36

R. Tovo et alii, Frattura ed Integrità Strutturale, 36 (2016) 119-129 DOI: 10.3221/IGF-ESIS.36.10

Load ratio

Specimen

Crack initiation advancing side advancing side double location not separated

α [deg]

W128 W122 W124 W120 W112 W129 W130 W117 W118 W113 W115 W111 W127 W114 W123 W116 W119 W121 W125

1

20

-40

0

run out

R=0.1

advancing side

-110

middle

-75

not separated

0

middle run out

-45

advancing side double location double location advancing side

89

160

30

-95

run out run out

R= -1

advancing side not separated

-135

run out Table 3 : Crack initiation location.

5

R= 0.1 R= ‐1

4

3

2

1 Specimen quantity

0

advancing

middle Side

double

Figure 8: Frequency of crack initiation by location.

125