Crack Paths 2012

t I t t t t

wzzomm,

Material 1

H z g o m m

Initial crack length

a 0 : 2 m m

Cyclic stress Ao=1OMpa

Stress ratio : R=O.1

Interface

9:30"

w \

E1/E2=4.0 or 0.25

Material 2

Fig.5 Crack in two-phase material with slant interface.

Sitfatecrntesosirstyn

<2

mI"MKP‘-1a-|

D[4's)3

1b

2

s

s

11

14

17

Cracklengtah [ m m ]

(a) Crack path.

(b) Changes of K1 and K H

Fig.6 Results w h e nE1/E2:4.0.

1U

Sifntatrcenetsoitsry

mK|MmPa|

M4501

2 5

8

11

14

17

C Hcklength :1 { m m }

(a) Crack path.

(b) Changes of K1 and K H

Fig.7 Results w h e nE1/E2:0.25.

C R A CGKR O W ITN PHA R T I C LRE I N F O R CMEA TD E R I A L .

Figure 8 shows a model of particle reinforced material. Four circular particles exist in

front of a crack. Young’s modulus of particles is 4 times larger than tht of base material.

920