Crack Paths 2006

1200

1000

800

[ N ] L O A D

600

400

200

Load- Experiment

Predicted load- upper bound

Predicted load - lower bound

A2/A1

0

0.0726

0.1726

0.2726

0.3726

0.4726

0.5726

0.6726

Figure 4: Critical load experimental and prediction for the P M M sApecimens.

Experiments on four-point bending specimens made of M A C O R

Four point bending (4PB) experiments were conducted on Machinable Ceramic

(MACOR- manufactured by Aremco) notched specimens at room temperature

(

E

] , [ 6 6 9 0 0 M P a c V

] , [ 1 0 3 IC

K M P a |

] [ 2 . 1 m M P a

) were loaded so to produce a

mixed mode loading state at the notch tip. In Figure 5 we show pictures of the crack

created at the V-notch tip in the various specimens.

Figure 5: Pictures of the crack at the

0 3 1 5 V-notch tip in 4PBM A C OsRpecimens