DYMAT 2009
Volume 1, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 325 - 330
Section Experimental Techniques
Published online 15 September 2009
DYMAT 2009 (2009) 325-330
DOI: 10.1051/dymat/2009045

Dynamic tensile fragmentations of Al2O3 rings under radial expansion loading

F.H. Zhou and Y.G. Wang

Mechanics and Materials Science Research Center, Ningbo University, Ningbo 315211, Zhejiang, China

Published online: 15 September 2009

A dynamic experimental method was developed to conduct expanding ring tests on a Split Hopkinson Pressure Bar. Ceramic rings made of alumina (Al2O3) were dynamically expanded and fragmentized using this test apparatus. Results show an apparent increase of the fragment numbers with the impact velocity. From the stress wave profiles recorded in the output bar, the dynamic tensile strength of the ceramic material is evaluated under simplified assumptions. Preliminary estimates showed that the tested material has a static tensile strength between 125 ~ 135 MPa, and a dynamic tensile strength between 160 ~ 250 MPa. The increase of the apparent tensile strength under impact loading agrees with the fact that fragment numbers increases with the loading rate.

© EDP Sciences 2009