期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 5, 页码 3043-3061出版社
WILEY
DOI: 10.1111/jace.18071
关键词
amorphization; atomistic simulation; boron carbide; continuum models; fracture; granular flow
资金
- Army Research Laboratory [W911NF-12-2-0022]
The study describes behavior models for hot-pressed boron carbide in extreme dynamic environments and the integration of physics-based models for deformation and failure mechanisms into a continuum model for the material. The models show that the importance of amorphization and fracture depends on geometry and impact conditions, providing guidelines for improved boron carbide materials design.
We describe models for the behavior of hot-pressed boron carbide that is subjected to extreme dynamic environments such as ballistic impact. We first identify the deformation and failure mechanisms that are observed in boron carbide under such conditions, and then review physics-based models for each of these mechanisms and the integration of these models into a single physics-based continuum model for the material. Atomistic modeling relates the composition and stoichiometry to the amorphization threshold, while mesoscale modeling relates the processing-induced defect distribution to the fracture threshold. The models demonstrate that the relative importance of amorphization and fracture are strongly dependent on the geometry and impact conditions, with the volume fraction of amorphized material being unlikely to be significant until very high velocities (similar to 3 km/s) are reached for geometries such as ball impact on plates. These connections to the physics thus provide guidelines for the design of improved boron carbide materials for impact applications.
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