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

用于微结构材料建模和表征的 X 射线计算机断层扫描系统的获取

• 批准号: 0116793
• 负责人: Balasingam Muhunthan
• 金额: $ 42.64万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0116793&HistoricalAwards=false
• 关键词: Acquisition; Ray; Computed; Tomography; System

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.

PI Eyad Masad Institution华盛顿州立大学头衔用于纳米结构材料建模和表征的x射线计算机层析成像系统的获取摘要该MRI奖是为了获得用于非侵入性评估工程材料微观结构的x射线计算机断层扫描（CT）系统。该系统在不透明固体内部微观结构特征的三维可视化方面是独一无二的。x射线CT系统将用于执行与颗粒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。第一个研究的重点是建立基于微观结构的连续体模型来研究颗粒材料的变形和局部化。该模型基于晶体塑性，但包含两个微观结构长度尺度；一个与塑性曲率（取向重分布）有关，另一个与孔隙率重分布有关。该研究的独特之处在于微观结构模型参数直接由微观测量确定。该研究不仅将为实验室试样应变局部化建模提供解析方法，而且还将为岩土工程中不实用的边值问题提供解析方法。这项工作的结果也将对其他类型的材料的建模产生影响，这些材料表现出变形不稳定性和剪切带，如金属和复合材料。陶瓷与金属基复合材料的工程性能受几个层次的微观结构控制。因此，第二项研究结合微观和宏观原理，开发多尺度模型对其进行描述。多尺度模型参数直接由x射线CT测量确定。使用这些模型将使设计和开发具有定制微结构的新材料成为可能。除了上述主要研究之外，华盛顿州立大学来自不同学科的许多其他研究活动将受益于拟议的系统。该系统的独特能力将大大有助于校外筹资，并鼓励与其他机构和研究中心进行更多合作。