Microstructure and Dynamic Behavior Correlation in Two-Phase TiB2+Al2O3 Ceramic
Abstract
The high-strain-rate deformation and damage response of four types of microstructurally-biased two-phase (nominally 30:70) TiB2+Al2O3 ceramics, produced by SHS or mechanical milling techniques, have been investigated in this work. The microstructural-bias includes differences in phase (grain) size and phase distribution, such that in one case a continuous (interconnected) TiB2 network surrounds the Al2O3 phase (qualitatively termed TA'), and in the other case the TiB2 and Al2O3 phases are interdispersed and uniformly inter-twined with each other (qualitatively termed TinA'). The work performed has focused on correlation of time-resolved measurements of dynamic spall and compressive yield strengths obtained from gas gun experiments and from split-Hopkinson bar experiments, with quantitative determination of the two-phase biased microstructure. Micromechanical modeling based on a cohesive surface formulation model that provides explicit account for arbitrary microstructures and arbitrary fracture patterns has also been developed to study the deformation and damage sub-structure evolution during impact loading. Deterministic and stochastic characterization of fracture resistance has also been performed and implemented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2002
- Accession Number
- ADA412647
Entities
People
- Min Zhou
- Naresh N. Thadhani
Organizations
- Georgia Tech