Acquisition and Development of Materials Testing Equipment and Computational Facilities For Granular Media

这一行动是对重大研究仪器计划MRI'98 （NSF98-16）的回应。这一行动是为了支持获取和开发独特的材料测试设备，用于表征颗粒介质的微观力学行为，以及用于开发和实施描述材料行为的本构模型的计算设施，以及用于解决边值问题的数值模型。该研究设备包括一个带有试样和环境室的加载装置，设计用于最近购买的数字放射照相-计算机断层扫描（DR/CT）扫描仪。该装置的运行允许在颗粒试样加载期间进行DR/CT扫描，从而允许在变形过程中在颗粒尺度上对材料的微观结构变化进行成像，从而了解各种工程材料的变形过程和破坏机制，其中内部结构变化是重要的。计算设备包括一个工作站，用于开发和实现本构模型。这项研究和计算设备将由土木工程系的两个研究小组共享；他的研究重点是颗粒材料的力学和热力学行为。寒冷地区组处理冰雪材料，而岩土工程组专注于土壤和土工合成材料。

9871068BrownThis actions is in response to the Major Research Instrumentation Initiative MRI'98 (NSF98-16). This action is to support the acquisition and development of unique materials testing equipment that would be used to characterize micro-mechanical behavior of granular media and computational facilities to be used for the development and implementation of constitutive models to describe material behavior, and numerical models to solve boundary-value problems. The research equipment consists of a load device with a specimen and environmental chamber to be designed for use inside a recently purchased Digital Radiography-Computer tomography (DR/CT) scanner. Operation of this device permits DR/CT scans to be taken during loading of granular specimens, thereby allowing imaging of microstructural material transformations on the granular scale during the deformation process, leading to an understanding of deformation processes and failure mechanisms in various engineering materials where internal structural changes are important. The computational equipment consists of a workstation for the development and implementation of constitutive models. This research and computational equipment will be shared by two research groups in the Department of Civil Engineering; whose focus is on the mechanical and thermodynamic behavior of granular materials. The cold regions group addresses snow and ice materials while the geotechnical group concentrates on soil and geosynthetic materials.