Field and laboratory studies of ductile strain localization on different length scales

不同长度尺度上延性应变局部化的现场和实验室研究

• 批准号: 5401865
• 负责人: Professor Dr. Mark R. Handy
• 金额: --
• 依托单位: Institut des Sciences de la Terre de Paris (ISTeP) - UMR 7193
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5401865?language=en
• 关键词: Field; laboratory; studies; ductile; strain

Finite strain in rocks is localized on different scales, from the intragranular scale to the scale of plate boundaries. In fact, the segmentation of the Earth's lithosphere into plates is a direct manifestation of strain localization. Over the years, several questions related to strain localization have vexed both earth scientists and materials scientists: (1) What processes govern the length- and time-scales of localization? How does localization affect the bulk mechanical properties of materials? Once strain localization patterns are established, how stable are these patterns with continued strain? These questions are not merely of academic interest, but have broader relevance for industrial society, as localization is tied to such diverse phenomena as earthquakes and mechanical instability of enigneering materials. To answer these questions, we propose a combined field and laboratory program. ... The overriding goal of the project is to establish scaling parameters for strain localization patterns, and to determine the processes underlying the evolution of these patterns in time and space. Such scaling parameters are required if there is to be any progress in geodynamic modeling of orogneses, rifting, or in deterministic modeling of seismicity.

岩石中的有限应变位于不同尺度上，从晶内尺度到板块边界尺度。事实上，地球岩石圈分割成板块是应变局域化的直接表现。多年来，与应变局部化相关的几个问题一直困扰着地球科学家和材料科学家：（1）什么过程控制着局部化的长度和时间尺度？局域化如何影响材料的整体机械性能？一旦建立了应变定位模式，这些模式在持续应变下的稳定性如何？这些问题不仅具有学术意义，而且与工业社会具有更广泛的相关性，因为定位与地震和工程材料的机械不稳定性等多种现象密切相关。为了回答这些问题，我们提出了一个现场和实验室相结合的计划。 ...该项目的首要目标是建立应变局部化模式的缩放参数，并确定这些模式在时间和空间上演化的过程。如果要在原质、裂谷的地球动力学建模或地震活动的确定性建模方面取得任何进展，就需要这样的缩放参数。