PSI - Issue 19

Shota Hasunuma et al. / Procedia Structural Integrity 19 (2019) 194–203 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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shown in Fig. 11. Observations of the EP specimen, which had no surface machined layer, and GR specimen, which had a plastic deformed layer, are omitted but cracks initiated from the slip band.

A

(d)

3.5  m

150

A

(a)

(b)

(c)

100

50 Position,  m

A'

100  m

 3.5

A'

300  m Loading direction

0

−5

0 5

Hight,  m

(g)

(e)

(h)

(f)

(h)

100

 m

100  m

100  m

300  m

Fig.10 Optical and laser micrographs of No.4-AM at N / N f, EP = 0 (a), 0.2(e), 0.3(f) and 0.77(g). (b) and (h) are close up image of (a) and (g), respectively. (c) is height distribution image using laser micrograph. Sectional configuration of surface on the A-A' line(d).

(d)

A

(a)

(b)

(c)

3.5  m

A

150

(b)

100

50 Position,  m

A'

100  m

 3.5

A'

Loading direction 300  m

0

−5

0 5

(g)

Hight,  m

(e)

(f)

(h)

(h)

100  m

100  m

100  m

300  m

Fig.11 Optical and laser micrographs of No.5-AM at N / N f, EP = 0 (a), 0.2(e), 0.3(f) and 0.77(g). (b) and (h) are close up image of (a) and (g), respectively. (c) is height distribution image using laser micrograph. Sectional configuration of surface on the A-A' line(d).