Effect of Crack Geometry on Dynamic Stress Intensity Factor under Impact Loading in Three Point Bend Configuration for a High Density Alumina Specimen

摘要

In the present paper, the effect of two different crack geometries on dynamic stress intensity factor for a three point bend configuration in short alumina ceramic beam has been studied. The first crack geometry has a typical surface edge crack (perpendicular to the surface) and the second one has a notched configuration with a small crack at its tip like a fatigue pre-crack. Real impact-response was captured using a suitable data acquisition system and fed into a standard finite element model. The solution was done using transient dynamic analysis. It was observed that crack with notch has a lower DSIF than that with straight surface crack. The efficacy of the model was validated by checking with the experimental results of DSIF available in literature.