An Experimental Approach to Understanding Self-Organization of Mode I Defects and Nucleation of Shear Fracture
理解 I 型缺陷自组织和剪切断裂成核的实验方法
基本信息
- 批准号:9805368
- 负责人:
- 金额:$ 11万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1998
- 资助国家:美国
- 起止时间:1998-09-01 至 2001-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
9805368Green, IIAlthough tensile fracture has been well understood for more than 50 years, shear fracture remains poorly understood, especially in terms of the nucleation process. The details of the self-organization process by which a population of microcracks evolves into a localized fault, and the factors controlling fault orientation remain poorly understood. With the discovery of high-pressure phase-transformation-induced faulting, there are now two mechanisms of shear failure available for study. Although the fundamental physics of the two mechanisms is different on the finest scale, the evidence suggests that on the scale of self-organization and faulting, the mechanisms behave similarly. Comparison of these two mechanisms can lead to new insights and potentially one can be used to resolve unanswered questions involving the other. In particular, the diagnostic appearance of the transformed material in microlenses makes the attempt to decipher the self-organization process much simpler than attempting to distinguish cracks of many generations in material faulted by "brittle" processes. This study will examine the approach to failure in Mg2GeO4 undergoing the olivine« spinel transformation at pressures greater than 2.5 GPa (pressures too high for "brittle" processes to participate) to map out the microstructural evolution from loading-generated microlenses, through the self-organization process, to faulting.
尽管人们对拉伸断裂已经了解了50多年,但对剪切断裂的了解仍然很少,特别是在形核过程方面。微裂纹群演化为局部断层的自组织过程的细节,以及控制断层走向的因素仍然知之甚少。随着高压相变断层的发现,目前有两种剪切破坏机制可供研究。尽管这两种机制的基本物理原理在最精细的尺度上是不同的,但有证据表明,在自组织和断层的尺度上,这两种机制的行为是相似的。比较这两种机制可以产生新的见解,其中一种机制可以用来解决涉及另一种机制的未解决问题。特别是,微透镜中转化材料的诊断外观使得破译自组织过程的尝试比试图区分由“脆性”过程损坏的材料中的许多代裂缝要简单得多。本研究将研究Mg2GeO4在大于2.5 GPa的压力下发生橄榄石-尖晶石转变的失败方法(压力太高,“脆性”过程无法参与),以绘制从加载产生的微透镜,通过自组织过程到断裂的微观结构演变。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
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Harry Green其他文献
Evidence of bidirectional relationship between type 2 diabetes and depression; a Mendelian randomization study
2 型糖尿病与抑郁症之间双向关系的证据;一项孟德尔随机化研究
- DOI:
10.1038/s41380-025-03083-0 - 发表时间:
2025-07-01 - 期刊:
- 影响因子:10.100
- 作者:
Renu Bala;Dale Handley;Alexandra Gillett;Harry Green;Jack Bowden;Andrew Wood;Inês Barroso;Cathryn M. Lewis;Jessica Tyrrell - 通讯作者:
Jessica Tyrrell
THE IMPACT OF DEPRESSION DIAGNOSIS ON DIABETES AND LIFETIME HYPERGLYCAEMIA
- DOI:
10.1016/j.euroneuro.2022.07.042 - 发表时间:
2022-10-01 - 期刊:
- 影响因子:
- 作者:
Jess Tyrrell;Alexandra Gillett;Francesco Casanova;Katie Young;Harry Green;Cathryn Lewis;Saskia Hagenaars - 通讯作者:
Saskia Hagenaars
Harry Green的其他文献
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{{ truncateString('Harry Green', 18)}}的其他基金
Collaborative EAGER Research: Mineral reactions during seismic slip and earthquake instability
EAGER 协作研究:地震滑移和地震不稳定期间的矿物反应
- 批准号:
1247951 - 财政年份:2012
- 资助金额:
$ 11万 - 项目类别:
Standard Grant
Establishing the Critical Parameters for Dehydration Embrittlement in Subduction Zones
建立俯冲带脱水脆化的关键参数
- 批准号:
1015264 - 财政年份:2010
- 资助金额:
$ 11万 - 项目类别:
Standard Grant
Collaborative Research: CSEDI--Grand Challenge for Experimental Study of Plastic Deformation Under Deep Earth Conditions
合作研究:CSEDI--深地条件下塑性变形实验研究的重大挑战
- 批准号:
0652626 - 财政年份:2007
- 资助金额:
$ 11万 - 项目类别:
Continuing Grant
Collaborative Research: A Study of Deep Subduction Integrating Broadband Seismology and Mineral Physics
合作研究:宽带地震学与矿物物理学相结合的深俯冲带研究
- 批准号:
0552011 - 财政年份:2006
- 资助金额:
$ 11万 - 项目类别:
Standard Grant
Technical Support for a Dual Beam Focused Ion Milling System for TEM Foil Preparation + 3D Chemical Analysis
用于 TEM 箔制备 3D 化学分析的双束聚焦离子铣削系统的技术支持
- 批准号:
0521896 - 财政年份:2005
- 资助金额:
$ 11万 - 项目类别:
Continuing Grant
Collaborative Research: COMPRES Grand Challenge for Experimental Study of Plastic Deformation under Deep Earth Conditions
合作研究:深部地球条件下塑性变形实验研究的 COMPRES 大挑战
- 批准号:
0135411 - 财政年份:2002
- 资助金额:
$ 11万 - 项目类别:
Continuing Grant
Experimental Investigation of the Rheology of Eclogite and Its Constituent Minerals at High Pressure
榴辉岩及其成分矿物高压流变性的实验研究
- 批准号:
0003631 - 财政年份:2001
- 资助金额:
$ 11万 - 项目类别:
Continuing Grant
Collaborative Research: Experimental Study of the Origin and Nature of High Pressure Faulting Relevant to Earthquakes in Subducting Lithosphere
合作研究:俯冲岩石圈与地震相关的高压断层的起源和性质的实验研究
- 批准号:
0125938 - 财政年份:2001
- 资助金额:
$ 11万 - 项目类别:
Continuing Grant
Technical Support for University of California, Riverside Technophysics Laboratory
为加州大学河滨分校技术物理实验室提供技术支持
- 批准号:
9731383 - 财政年份:1998
- 资助金额:
$ 11万 - 项目类别:
Standard Grant
Collaborative Research: Dehydration Embrittlement of Serpentine at High Pressures: Implications for Intermediate and Deep Earthquakes
合作研究:蛇纹石在高压下的脱水脆化:对中度和深层地震的影响
- 批准号:
9725575 - 财政年份:1998
- 资助金额:
$ 11万 - 项目类别:
Continuing Grant
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