Crack growth data from dynamic tests under contact loading
Fett, T.; Creek, D.; Badenheim, D.; Oberacker, R.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 24 (2004), 7, 2049–2054
Crack growth data from dynamic tests under contact loading?
Bending and contact strength tests at different loading rates were carried out on a commercial alumina. From the comparison of the two strength tests, it was found that the investigated alumina does not exhibit any subcritical crack growth under contact loading, although a strong subcritical crack growth effect is obvious in bending tests. The different behaviour call be explained as the consequence of mode-II failure accompanied with K-1 < 0 in the contact strength tests and of pure mode-I failure (i.e. K-1 > 0) in the bending tests.