Physical Basis for the Mechanical Equation of State: Statistical Analysis of Deformation Induced Microstructures in Mineral Rheology

力学状态方程的物理基础：矿物流变学中变形引起的微观结构的统计分析

• 批准号: 9706332
• 负责人: Donald Stone
• 金额: $ 19.5万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706332&HistoricalAwards=false
• 关键词: Physical; Basis; Mechanical; Equation; State

9706332 Stone Stress-relaxation experiments have demonstrated that many crystalline mineral and metal systems exhibit a mechanical (rheological) equation of state, by which it is possible to completely and uniquely specify the dislocation creep kinetics in terms of a single state variable, which is termed the "hardness" parameter. This state variable must be related to one or more aspects of the deformation- induced microstructure. The PIs propose in this research to determine a microstructural basis for the hardness parameter in terms of statistical distributions of large numbers of dislocations and of larger-scale structures, for example, low-angle (subgrain) boundaries generated during transient and steady state creep. The work focuses on single-crystal Fe-Mg silicate olivine with the ultimate goal of enhancing our ability to accurately extrapolate laboratory creep data to geophysical problems. ***

小行星9706332 应力松弛实验表明，许多晶体矿物和金属系统表现出一个机械（流变）状态方程，它是可能的，完全和唯一指定的位错蠕变动力学在一个单一的状态变量，这是所谓的“硬度”参数。 此状态变量必须与 变形诱导微结构的一个或多个方面。 PI建议在这项研究中，以确定大量的位错和较大规模的结构，例如，在瞬态和稳态蠕变过程中产生的低角度（亚晶粒）边界的统计分布方面的硬度参数的微观结构的基础。 这项工作的重点是单晶铁镁硅酸盐橄榄石，最终目标是提高我们的能力，准确地推断实验室蠕变数据的地球物理问题。 ***