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的尺度上，从刻度内尺度到板边界的尺度。实际上，将地球岩石圈分割为板是应变定位的直接表现。多年来，与应变定位有关的几个问题引起了地球科学家和材料科学家的困扰：（1）哪些过程控制了定位的长度和时间尺度？本地化如何影响材料的批量机械性能？一旦建立了应变定位模式，这些模式与持续应变的稳定程度如何？这些问题不仅具有学术兴趣，而且对工业社会具有更广泛的意义，因为本地化与地震和机械不稳定材料等各种现象相关。为了回答这些问题，我们提出了一个联合的领域和实验室计划。 ...该项目的重要目标是建立缩放参数，以确定应变定位模式，并确定这些模式在时空中演变的过程。如果要在Oragnes，裂谷或地震性确定性建模中取得任何进展，则需要此类缩放参数。