The numerical analysis of dynamically loaded ceramic: a crack softening approach

✍ Scribed by Paul J. Hazell; Michael J. Iremonger

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 257 KB
• Volume: 48
• Category: Article
• ISSN: 0029-5981
• DOI: 10.1002/(sici)1097-0207(20000710)48:7<1037::aid-nme914>3.0.co;2-r

✦ Synopsis

A physically based crack softening approach to modelling the failure of brittle materials that have been subjected to dynamic loading is presented and applied to a two-dimensional non-linear transient dynamic hydrocode. It is assumed that there are a number of evenly distributed and orientated micro#aws within the brittle material that are activated by a dynamically applied stress. Modes I and II stress intensity factors are calculated and compared to critical values, at which point the cracks grow at a velocity dependent on mode I stress intensity factor. The strength of the ceramic is degraded according to the length of the cracks. A simulation of a steel sphere impacting and penetrating a ceramic target at 1500 m/s is presented. Comparisons are drawn from experimental data.