Pressure-shear impact investigation of dynamic fragmentation and flow of ceramics
As part of an effort to understand the behavior of brittle materials under impact loading conditions, a new plate impact experiment is introduced to study the shearing resistance of ceramic rubble under high pressures and high shearing rates. Rubblization of intact ceramic occurs during penetration by a projectile and the shearing resistance of the rubble influences the overall resistance to penetration and the erosion of the penetrator. In the experiment, a 100-129um thick layer of alumina powder is sandwiched between two hard, elastic plates and impacted by another hard, elastic flyer plate. The impacting plates are skewed relative to the direction of approach in order to generate pressure and shear waves. The powder layer is subjected to well-characterized, plane wave loading conditions with compressive stresses of the order of 3 GPa and shear strain rates of the order of 10% 5 %. Transverse displacement-time profiles recorded at the rear surface of the target plate enable determination of the flow stress of the rubble. The same sandwich configuration will also be used to study the shearing response, as well as the process of fragmentation, of intact ceramics. The information obtained from these experiments will be used to develop computational and analytical models for the response of ceramics under dynamic loading.
- Research Organization:
- Brown Univ., Providence, RI (United States). Div. of Engineering
- OSTI ID:
- 147369
- Report Number(s):
- AD-A--296109/2/XAB; CNN: Contract DAAL03-92-G-0107
- Country of Publication:
- United States
- Language:
- English
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