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

9871068浏览此操作是对重大研究仪器倡议MRI‘98(NSF98-16)的响应。这一行动是为了支持获得和开发独特的材料测试设备，这些设备将用于表征颗粒介质的微观机械行为，以及用于开发和实施描述材料行为的本构模型和解决边值问题的数值模型的计算设施。研究设备包括一个加载装置和一个样品和环境室，该装置将被设计用于最近购买的数字放射成像-计算机断层扫描(DR/CT)扫描仪中。通过该设备的操作，可以在装载颗粒样品的过程中进行DR/CT扫描，从而可以对变形过程中颗粒尺度上的微观结构材料转变进行成像，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。计算设备由用于开发和实施本构模型的工作站组成。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，他们的重点是颗粒材料的机械和热力学行为。寒冷地区小组处理冰雪材料，而土工小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.