Fatigue Crack Paths 2003

SUS316NG

ModeI Mixe mode ΔJIII/ΔJI = 0.5 J I/ΔJI 12

m

sp a c i n g ,

o n

t i

S t r i a

10-7 2468 0 810-6-2465

68

6 8

2 4 6 8 -6 2 4 6 8

10 -7

-5

10

10

Crack propagation rate, da/dN m/cycle

Figure 8. Relation between striation spacing and crack propagation rate.

(2) The relation between crack propagation rate and ΔJ under mixed-mode loading lie

between those for mode I and mode III loading. At the same ΔJ, the crack

propagation rate decreases with increasing ratio of ΔJIII/ΔJI.

(3) Striations were observed on the fatigue fracture surface created under mixed mode

loading. The striation spacing was equal to the crack propagation rate as in the case

of modeI loading.

R E F E R E N C E S

Ritchie, R. O., McClintock, F. A., Nayeb-Hashemi, H. and Ritter, M. A. (1982)

1.

Metallurgical Trans. 13A-1, 101-110.

2.

Tschegg, E. K. (1983) J. Mater. Sci. 18, 1604-1614.

McClintock, F. A. and Ritchie, R. O. (1981) In: Mechanics of Fatigue, AMD,47, pp.

3.

4. 6

1-9., Mura, T. (ed.), ASME,N e wYork.

5. 7

Tschegg, E. K. (1983) Acta Metallurgica 31-9, 1323-1330.

Tanaka, K., Akiniwa, Y. and Nakamura, H. (1996) Fatigue Fract. Engng Mater.

Struct. 19, 571-579.

Tanaka, K., Akiniwa, Y. and Yu, H. (1999) A S T M S T 1P359, 295-311.

Itoh, Y. Z., Murakami, T. and Kashiwaya, H. (1988) Engng Fract. Mech. 31, 967

975.