RIA: Micromechanical Study of Inelasticity in Brittle and Amorphous Materials

9309006埃斯皮诺萨本研究启动奖的目的是开发一个脆性非晶材料，如陶瓷和玻璃，动态加载的本构模型。 特别是，玻璃薄膜上的压力剪切实验，其中施加高剪切应力，高应变率和高压力，提供了理想的条件，用于推导和验证描述这些非晶材料的本构模型。 这样的模型将被纳入在平板冲击实验条件下的氧化铝多晶体的微观力学模拟。 假设的模型预计将预测损伤引起的各向异性和剪切局部化等现象。 模型验证将通过比较模拟和干涉测量的速度历史正常的影响和压力剪切实验进行氧化铝样品。

9309006 Espinosa The purpose of this Research Initiation Award is to develop a constitutive model for brittle amorphous materials, such as ceramics and glass, for dynamic loading. In particular, pressure- shear experiments on glass thin films, in which high shear stresses, high strain rates and high pressure are imposed, offer ideal conditions for the derivation and validation of a constitutive model describing these amorphous materials. Such a model will be incorporated in micromechanical simulations of alumina polycrystals under the conditions of plate impact experiments. The postulated model is expected to predict such phenomena as damage-induced anisotrophy and shear localization. Model validation will be accomplished by comparison of simulated and interferometrically measured velocity histories in normal impact and pressure-shear experiments conducted on alumina samples.