Acquisition of X-Ray Computed Tomography System for the Modeling and Characterization of Materials with Microstructure

OIA-0116793 Pi Eyad Masad 机构 华盛顿州立大学 标题 “获取用于纳米结构材料建模和表征的x射线计算机断层扫描系统 摘要 该MRI奖项是为了获得用于工程材料微观结构非侵入性评估的X射线计算机断层扫描（CT）系统。 该系统是独特的不透明固体物体内部的微观结构特征的三维可视化。 X射线CT系统将被用来执行与粒状变形相关的微观结构特征的详细观察。 它还将用于新一代陶瓷和金属基复合材料的开发。 第一项研究的重点是发展一个基于微观结构的连续体模型，以研究颗粒材料的变形和局部化。 该模型是基于晶体塑性，但包括两个微观结构的长度尺度;一个与塑性曲率（取向重新分布），另一个是有关的孔隙度重新分布。 这项研究的独特之处在于，微观结构模型参数直接从微观测量确定。 该研究将导致分析方法，不仅在实验室标本，但在岩土工程中的实际边值问题的应变局部化建模。 这项工作的结果也将有影响的其他类型的材料，表现出变形不稳定性和剪切带，如金属和复合材料的建模。 陶瓷和金属基复合材料的工程行为是由多层次的微观结构控制的。 因此，第二项研究结合微观和宏观的原则，并开发多尺度的摩尔斯他们的描述。 多尺度模型参数直接从X射线CT测量确定。 使用这些模型将能够设计和开发具有定制微观结构的新材料。 除了上述主要研究之外，华盛顿州立大学的许多其他不同学科的研究活动将受益于拟议的系统。 该系统的独特功能将大大有助于校外资金，并鼓励与其他机构和研究中心进行更多的合作。

OIA-0116793 PI Eyad Masad Institution Washington State University Title "Acquisition of x-Ray Computed Tomgraphy System for the Modeling and Characterization of Materials with Nanostructure Abstract This MRI award is for the acquisition of an X-ray computed tomography (CT) system for non-invasive evaluation of the microstructure of engineering materials. The system is unique for the visualization of three-dimensional of microstructural features in the interior of opaque solid objects. The X-ray CT system will be used to perform detailed observations of the microstructural features associated with granular deformation. It will also be used in the development of new generation ceramics and metal matrix composites. The focus of the first research is on the development of a microstructure based continuum model to study the deformation and locialization in granular materials. The model is based on crystal plasticity but inclused two microstructure length scales; one associated with the plastic curvature (orientation re-distribution) and the other one is related to the porosity re-distribution. This study is unique in that the microstructure model parameters are determined directly from microscopic measurements. The study will lead to analytical methods for modeling strain localization not only in laboratory specimens, but also inpractical boundary value problems in geotechnical engineering. The outcome of this work will also have implications to the modeling of other types of materials that exhibit deformation instabilities and shear banding such as metals and composites. The engineering behavior of ceramics and metal matrix composite materials is controlled by the microstructure of several levels. Therefore, the second study combines microscopic and macroscopic principles and develops multiscale mosels for their description. The multiscale model parameters are determined directly from X-ray CT measurements. Use of such models will enable the design and development of new materials with tailored microstructures. In addition to the above major studies, a host of other research activities from different disciplines at Washington State University will benefit from the proposed system. The unique capabilities of the system will contribute substantially to the extramural funding, and encourage more collaboration with other institutions and research centers.