Crack Paths 2012

Crack growth simulation results are shown in Fig. 9. Crack grows winding and by

passing all particles and keeps growing in Material 1. It does not enter particles. SIF is

shown in Fig.9 (b). K1 value increases due to crack growth, but increasing rate is

changing. K11 keeps very low values, but it is not zero, which causes the change of

crack path direction. Throughthese crack growth proceses, crack growth rate is delayed

comparing with homogeneousmaterial.

I 1 I I I I I

Material 1

W :03 m m

H : 1 2 0 m m

b

D = 5 m m

r = l 2 m m

I

b=l 2.5m m

Initial crack length a0=1 m m

,

Cyclic stress A o = l 0 M p a

Stress ratio : R=0.l

w

E1=51.5Gpa, E2=206GPa

Fig.8 Modelof particle reinforced plate.

Sifntatrcenetsoitsry

DN-Ibfl‘l

1

6 1 1 15 21 26

C r a c lkength :1 [ m m ]

(a) Crack path.

(b) Changes of SIF.

Fig.9 Numerical results.

S U M M A R Y

It is shown that S-FEMsuccessfully simulates complicated crack growth process in

heterogeneous material. Though exampes shown in this paper are in two-dimensional

fiels, it is easy to apply this methodto three-dimensional problem. Using this technique,

fatigue crack growth in composite material, and stress corrosion cracking in welded

joint maybe simulated well in near future.

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