On the failure of shocked titanium diboride

Bourne, N. K.; Gray, G. T.; Millett, J. C. F.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p589
Academic Journal
The failure of brittle materials in uniaxial compressive shock loading has been the subject of much recent discussion. For instance, the physical interpretation of the yield point, the Hugoniot elastic limit (HEL), is not explained in brittle materials. Titanium diboride is known to exhibit an anomalous Hugoniot containing cusps at 4.5-7 and 13-17 GPa. These features are additionally found on the free-surface wave-profiles. Various variables have been measured to find an explanation for these features. In other ceramics, failure has been seen to occur behind a travelling boundary that follows a shock front called a failure wave across which the strength of the material dramatically reduces. In order to elucidate whether the cusps are related to failure, gauges were embedded in order to measure the lateral stress behind the shock front. As in other materials this stress was seen to rise across a failure front. However, this phenomenon only occurred over certain stress ranges. A mechanical interpretation is suggested relating to the cusps observed.


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