Effect of Grain Size, Second Phases and Texture in the Dynamic Failure of Ceramics

9523113埃斯皮诺萨提出的研究涉及一个结合实验和理论的方法，使用冲击载荷来研究陶瓷的微观结构特征的影响失败。 实验方法使用新的板和冲击实验的应力脉冲的幅度和持续时间可以选择，使损坏事件是稳定的，它的演变可以监测下定义良好的变形历史。 因此，可以识别损伤演化而不是最终累积损伤。 这些结果将为全面理解非弹性变形过程和基于物理的本构方程的制定奠定基础。 干涉测量的速度历史将用于检查制定的模型。 测量和数值计算的速度历史之间的相关性将通过对实验进行数值模拟来完成，该实验采用非弹性模型来解释所观察到的失效机制。 ***

9523113 Espinosa The proposed research deals with a combined experimental and theoretical approach using impact loading to study the influence of microstructural features on failure of ceramics. The experimental approach uses novel plate and impact experiments where the magnitude and duration of stress pulses can be selected so that the damage event is stable and its evolution can be monitored under well defined deformation histories. As a result, damage evolution rather than final accumulated damage can be identified. These results will form the basis for comprehensive understanding of the processes occurring during inelastic deformation and formulation of physically based constitutive equations. Interferometrically measured velocity histories will be used in the examination of formulated models. Correlation between measured and numerically computed velocity histories will be accomplished by performing numerical simulations of the experiments with inelastic models accounting for the observed failure mechanisms. ***