PSI - Issue 2_A

Hiroyuki Hirakata et al. / Procedia Structural Integrity 2 (2016) 1335–1342

1337

Author nam

e / Structural Inte

grity Procedia 0

0 (2016) 000–00

0 th 2 ܽ ଴ (shown -Tech Science in Table 1. d by Hirakata en via a wei t sensor (Key center openin , Ltd., KH-27 cted at room propagation exp Fracture tim ݐ ୤ , ks 40.3 699.3

3

nm f intro or FE A used mech LC-2 defin 300x rang

ilms and 64 n duced in the h I, Versa 3D) n experimenta for the expe anism, and t 420, range: ed in Fig. 1( ). The applie e 295.3–299.2

m for ~400 n ourglass spe system. The l setup for cr riments. The he elongation ±3 mm, resol d), were evalu d gross stress K, as listed 1 Specimen size ickness ݄ , nm Wid ݓ , m 60±18 2

m films, resp cimens using half initial no eep testing o machine can of the specim ution: 0.2  m ated using a ߪ are listed i in Table 1, in s, experimental th m Half notc ܽ ଴ ,  49 10

ectively. A ce a focused ion tch length ܽ ଴ f freestanding apply a dead en is measu ). The crack digital optica n Table 1. Th laboratory air conditions, and e h length m App ߪ 0

nter notch wi beam (FIB) ( of each speci films previo load on a thi red by a lase length 2 ܽ an l microscope e experiment . xperimental resu lied stress , MPa Tes

th initial leng Hitachi High men is listed usly develope n film specim r displacemen d the crack (HIROX Co. s were condu

in Fig. 1(d)) Corp., SMI9 et al. (2012) ght through a ence Corpor g displaceme 00, magnifica temperature i

was 200, was link ation nt ܸ , tion: n the

Table

lts of creep crack ting temperature T , K

eriments. e

Transient ti ݐ ୲୰ , ks 0.84 3.2

me

Th

S

pecimen No.

240-1 240-2 240-3 240-4 390-1 390-2 390-3 390-4

2 2 2 3 4 3

160 120 170 160 160 120 170 160

298.9±0.3 298.9±0.4 298.8±0.4 299.2±0.5 296.0±0.6 296.6±0.8 296.9±1.0 295.3±0.1

12±17 58±13 195±5 59±15 00±13 70±10 420±9

24 50 50 97 25 49

79.0 88.4 395.5 1160.7

0.51 0.93 4.9 10.2

1

2

670.2 29.41

4.0 5.1

1

Fig.1 Hourg displa

Specimen confi lass type speci cement. (e) EBS

gurations of Au mens are used D crystal orienta

freestanding film for creep crack tion maps of film

s. (a) Dumbbe propagation ex surfaces.

ll type specimen periments. (d) D

is used for cre efinitions of cr

ep strain rate ex ack length and

periments. (b) a crack center op

nd (c) ening