Issue 38

T. Sawada et alii, Frattura ed Integrità Strutturale, 38 (2016) 92-98; DOI: 10.3221/IGF-ESIS.38.12

0.5Vf, α=1/0 0.5Vf, α=2/1 0.5Vf, α=1/1 0.5Vf, α=0/1 0.2Vf, α=1/0 0.2Vf, α=2/1 0.2Vf, α=1/1 0.2Vf, α=0/1 0.0Vf, α=1/0 0.0Vf, α=2/1 0.0Vf, α=1/1 0.0Vf, α=0/1

Static strength

1.0

0.1 Equivalent effective stress σ * [ - ] 10 -1 10 0 0 1

= C

( σ *) n ･ N f

n =26.2

1000 1 3

10000 10 4

100000 1000000 1 5 1 6

1

100 2

10

Fracture cycles N f

[cycles]

Figure 5 : Relationships between σ * and N f

with various α in C-SGP.

0.5Vf, α=0/1 0.5Vf, α=2/1 0.5Vf, α=1/1 0.5Vf, α=1/0 0.2Vf, α=0/1 0.2Vf, α=2/1 0.2Vf, α=1/1 0.2Vf, α=1/0 0.0Vf, α=0/1 0.0Vf, α=2/1 0.0Vf, α=1/1 0.0Vf, α=1/0

Static strength

1.0

0.1 Equivalent effective stress σ * [ - ] 10 -1 10 0

( σ *) n ･ N f

= C

n =26.3

10 3

1 4

10 5

1 6

1

100 2

0.1

1

10

1000 10000 100000 1000000

Fracture cycles N f

[cycles]

Figure 6 : Relationships between σ * and N f

with various α in I-SGP.

Figure 7 : A typical tensile fracture surface situations with scanning electron microscopes in C-SGP. (05 V f )

97