GOALI - Ultrafine Grained and Nanostructured Ceramics : Influence of Processing, Grain Size and Strain Rate on Fracture Characteristics

GOALI-超细晶粒和纳米结构陶瓷：加工、晶粒尺寸和应变速率对断裂特性的影响本项目的重点是研究大块超细晶粒（晶粒尺寸为20-200 nm）陶瓷的加工-结构-性能关系，这些陶瓷使用新的合成和加工方法快速固结到接近理论密度。率相关的压痕断裂特性和这些结果的影响，以材料去除在高速率的过程中，如冲击，动态磨损和高速磨削将进行研究。基于实验和微观观察，将开发分析和数值模型，以更好地了解晶粒尺寸对这类独特材料的机械响应的影响。拟议的调查是显着的实际利益，因为它们将有助于优化设计，成功使用和开发这些陶瓷在动态应用中的全部技术潜力。所获得的见解将有助于探索“纳米级材料设计空间”，以优化晶粒尺寸和性能，以应对特定的挑战。

GOALI-Ultrafine Grained and Nanostructured Ceramics:Influence of Processing, Grain Size and Strain Rate on Fracture Characteristics The focus of this project is to investigate the processing-structure-property relationships in bulk ultrafine grained (20-200 nm in grain size) ceramics that are rapidly consolidated to near theoretical density using novel synthesis and processing methods. The rate-dependent indentation fracture characteristics and the implications of these results to material removal during high-rate processes such as impact, dynamic wear and high speed grinding will be investigated. Based on the experimental and microscopic observations, analytical and numerical models will be developed to provide better insight into the effect of grain size on the mechanical response of this unique class of materials. The proposed investigations are of significant practical interest, because they will assist in optimal design, successful use and exploitation of the full technological potential of these ceramics in dynamic applications. Insight gained will facilitate exploration of the 'nano-scale materials design space' for optimizing the grain size and the properties to meet specific challenges.