Testing Stress Percolation as a Model for Stress Transmission in Rocks

测试应力渗透作为岩石中应力传递的模型

基本信息

  • 批准号:
    1417218
  • 负责人:
  • 金额:
    $ 32.8万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2014
  • 资助国家:
    美国
  • 起止时间:
    2014-09-01 至 2019-08-31
  • 项目状态:
    已结题

项目摘要

This project will test stress percolation hypothesis and its utility for working with geologic materials. Both scientists and engineers have assumed that when a rock is loaded by either tectonic forces or within the context of engineering projects, the load is borne evenly throughout the rock. The PI has developed an alternative hypothesis that the stresses produced by external loads on a rock are distributed throughout the rock according to a pattern that resembles the pattern created by water flowing through otherwise dry sand. If the hypothesis proves correct, then stress distribution in rocks will join a large class of phenomena that exhibit 'percolation' behavior, including the patterns of stress distribution observed in granular materials. Thus one implication of the hypothesis is that there is a single unifying physical model for deformation of all earth materials. The value in understanding the stress distribution in rocks is that it will allow us to create better models of rock deformation and better predict the mechanical behavior of rocks, which has implications for deepening our understanding of a variety of Earth processes as well engineering applications. The existence of stress percolation and a refined understanding of how it operates in rocks has tremendous implications for many disciplines beyond geophysics. Researchers in materials science, metallurgy, and shock physics, all struggle with the so called 'polycrystalline problem' - like rocks, many solid materials are composed of aggregates of crystalline grains with a variety of properties. Understanding the response to loading of many of these materials has presented challenges similar to those experienced by those working on rock deformation. Thus, this research will contribute to a better understanding of mechanical problems in all of these disciplines. Using finite element (FEM) simulations of a polycrystalline material the PI has recently shown that local variations in stress and strain participate in large-scale patterns, likely caused by stress percolation. The patterns are a function of the heterogeneity and statistical distribution of elastic and plastic properties across the population of mechanical components (grains and grain boundaries) in the material. Greater degrees of heterogeneity lead to more intense stress concentrations across a less dense pattern. Lower degrees of elastic heterogeneity lead to a denser pattern of stress transmission that carries smaller modulations. Paralleling the development of shear bands in granular materials, the stress patterns lead directly to shear localization. The proposed project will compare the stress and strain heterogeneity observed in experimentally deformed mono-phase rocks with the stress and strain heterogeneity observed in FE models tuned to simulate these rocks. Specifically, the variation in the orientation of local stress tensor as predicted by FE models will be compared with microstructures that are sensitive to the compression direction such as twins and kinkbands and the distribution of the magnitude of the local compressive stress predicted by the FE models will be compared with local compressive stress distributions derived from synchrotron x-ray diffraction data from in-situ deformation experiments. Model design elements to be examined include the shapes of grains, grain boundary and grain interior rheology, as well as model size and aspect ratio. The impact of using 2D vs 3D models will also be examined. Additional direct comparisons will be made between the pattern of variation in microstrains observed on the surface of experimentally deformed polycrystalline slabs and the results from FE models built to match EBSD maps of the slab surfaces. These comparisons between models and experimental data will provide a test of the stress percolation hypothesis and provide a foundation for further investigations of stress percolation.
本计画将测试应力逾渗假说及其在地质材料处理上的效用。 科学家和工程师都认为,当岩石受到构造力或工程项目的载荷时,载荷会均匀地分布在整个岩石上。 PI提出了另一种假设,即岩石上的外部载荷产生的应力分布在整个岩石中,其分布模式类似于水流过干燥沙子时产生的模式。 如果这一假设被证明是正确的,那么岩石中的应力分布将加入一大类表现出“渗流”行为的现象,包括在颗粒材料中观察到的应力分布模式。 因此,该假说的一个含义是,所有地球物质的变形都有一个统一的物理模型。了解岩石中应力分布的价值在于,它将使我们能够创建更好的岩石变形模型,并更好地预测岩石的力学行为,这对加深我们对各种地球过程以及工程应用的理解具有重要意义。 应力渗流的存在以及对它在岩石中如何作用的精确理解,对物理学之外的许多学科都有巨大的意义。 材料科学、冶金学和冲击物理学的研究人员都在努力解决所谓的“多晶问题”--就像岩石一样,许多固体材料是由具有各种性质的晶粒聚集体组成的。 理解这些材料对载荷的响应提出了与那些从事岩石变形工作的人所经历的挑战类似的挑战。 因此,这项研究将有助于更好地了解所有这些学科的机械问题。使用有限元(FEM)模拟的多晶材料的PI最近表明,局部变化的应力和应变参与大规模的模式,可能是由应力渗流。这些模式是材料中机械部件(晶粒和晶界)群体的弹性和塑性特性的非均匀性和统计分布的函数。 更大程度的不均匀性导致更强烈的应力集中在一个不太密集的模式。 较低程度的弹性不均匀性导致更密集的应力传递模式,其携带较小的调制。 应力模式直接导致剪切局部化,它与剪切带的发展相平行。 拟议的项目将比较在实验变形单相岩石中观察到的应力和应变不均匀性与在调整模拟这些岩石的FE模型中观察到的应力和应变不均匀性。 具体而言,FE模型预测的局部应力张量的取向的变化将与对压缩方向敏感的微观结构(例如孪晶和扭结带)进行比较,并且FE模型预测的局部压缩应力的大小的分布将与从来自原位变形实验的同步加速器X射线衍射数据得到的局部压缩应力分布进行比较。模型设计要素包括晶粒形状、晶界和晶粒内部流变学,以及模型尺寸和长宽比。还将研究使用2D与3D模型的影响。额外的直接比较将在实验变形的多晶板坯的表面上观察到的微应变的变化模式和从FE模型建立匹配EBSD地图的板坯表面的结果之间。这些模型和实验数据之间的比较将提供一个测试的应力渗流假设,并提供了一个基础,为进一步研究应力渗流。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ monograph.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ sciAawards.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ conferencePapers.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ patent.updateTime }}

Pamela Burnley其他文献

Pamela Burnley的其他文献

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

{{ truncateString('Pamela Burnley', 18)}}的其他基金

Collaborative Proposal GEOPAths:IN Recruiting through location-based Curriculum and Field and Laboratory Research Experience for High School Students, Teachers and Undergraduates
合作提案 GEOPAths:IN 通过基于地点的课程以及针对高中生、教师和本科生的现场和实验室研究经验进行招聘
  • 批准号:
    2119989
  • 财政年份:
    2022
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
CSEDI Collaborative Research: Grand Challenge for Experimental Study of Plastic Deformation Under Deep Earth Conditions
CSEDI合作研究:深地条件下塑性变形实验研究的巨大挑战
  • 批准号:
    1361339
  • 财政年份:
    2014
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
In-situ Synchrotron X-ray Diffraction Study of Quartz Deformation
石英变形的原位同步加速器 X 射线衍射研究
  • 批准号:
    0838579
  • 财政年份:
    2009
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
Collaborative Research: COMPRES Grand Challenges for Experimental Study of Plastic Deformation
合作研究:COMRES 塑性变形实验研究的巨大挑战
  • 批准号:
    0813789
  • 财政年份:
    2008
  • 资助金额:
    $ 32.8万
  • 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:
    0741521
  • 财政年份:
    2007
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Continuing 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:
    0652894
  • 财政年份:
    2007
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Continuing Grant
Collaborative Research: COMPRES Grand Challenges for Experimental Study of Plastic Deformation
合作研究:COMRES 塑性变形实验研究的巨大挑战
  • 批准号:
    0136107
  • 财政年份:
    2002
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
Collaborative REU Site Proposal: Atlanta Consortium for Research in the Earth Sciences (ACRES): Research Experiences for Undergraduates and Science Teachers
REU 合作场地提案:亚特兰大地球科学研究联盟 (ACRES):本科生和科学教师的研究经验
  • 批准号:
    0139539
  • 财政年份:
    2002
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
REU--COLLABORATIVE RESEARCH: Atlanta Consortium for Research in the Earth Sciences (ACRES): Research for Undergraduates and Science Teachers
REU--合作研究:亚特兰大地球科学研究联盟 (ACRES):针对本科生和科学教师的研究
  • 批准号:
    9820666
  • 财政年份:
    1999
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Continuing Grant
Investigation of Internal Stresses and Strains Induced by the Olivine-Spinel Transformation: Mechanical Models and Microstructural Observations
橄榄石-尖晶石转变引起的内应力和应变的研究:力学模型和微观结构观察
  • 批准号:
    9896090
  • 财政年份:
    1998
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Continuing Grant

相似国自然基金

Tmem30a通过ER Stress/NF-κB信号通路调节肠上皮细胞屏障功能稳态介导炎症性肠病的研究
  • 批准号:
    82300629
  • 批准年份:
    2023
  • 资助金额:
    30 万元
  • 项目类别:
    青年科学基金项目
二甲双胍抗肥胖新机制:调节小胶质细胞ER stress-EVs缓解下丘脑炎症
  • 批准号:
  • 批准年份:
    2022
  • 资助金额:
    30 万元
  • 项目类别:
    青年科学基金项目
肿瘤相关巨噬细胞通过Stress Granule 形成调控炎症小体促进舌鳞癌转移的机制研究
  • 批准号:
  • 批准年份:
    2021
  • 资助金额:
    10.0 万元
  • 项目类别:
    省市级项目
ACSL4/ER stress/GPX4通路在溃疡性结肠炎中对Ferroptosis的调控机制研究
  • 批准号:
  • 批准年份:
    2021
  • 资助金额:
    30 万元
  • 项目类别:
    青年科学基金项目
炎症相关因子 RKIP 通过活化 ER stress 相关的IRE1α/XBP1 信号轴调控肝脏疾病的机制研究
  • 批准号:
    LY22H030007
  • 批准年份:
    2021
  • 资助金额:
    0.0 万元
  • 项目类别:
    省市级项目
基于ROS-ER stress-Ca2+信号通路研究健脾益肺II号减少COPD气道上皮细胞凋亡的作用机制
  • 批准号:
  • 批准年份:
    2020
  • 资助金额:
    55 万元
  • 项目类别:
    面上项目
CAMKIV-MHC Class I-ER Stress途径对骨骼肌炎症及再生的调控及机制研究
  • 批准号:
  • 批准年份:
    2019
  • 资助金额:
    10.0 万元
  • 项目类别:
    省市级项目
舌鳞癌细胞通过ER stress传递激活巨噬细胞调控肿瘤转移的机制研究
  • 批准号:
  • 批准年份:
    2019
  • 资助金额:
    10.0 万元
  • 项目类别:
    省市级项目
β-arrestin-2通过ER-stress/PUMA调控Beclin1信号在结肠炎中的作用
  • 批准号:
    81800458
  • 批准年份:
    2018
  • 资助金额:
    21.0 万元
  • 项目类别:
    青年科学基金项目

相似海外基金

Proton, alpha and gamma irradiation assisted stress corrosion cracking: understanding the fuel-stainless steel interface
质子、α 和 γ 辐照辅助应力腐蚀开裂:了解燃料-不锈钢界面
  • 批准号:
    2908693
  • 财政年份:
    2027
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Studentship
Collaborative Research: DRMS:Group cognition, stress arousal, and environment feedbacks in decision making and adaptation under uncertainty
合作研究:DRMS:不确定性下决策和适应中的群体认知、压力唤醒和环境反馈
  • 批准号:
    2343727
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Continuing Grant
NSF PRFB FY 2023: Impact of Environment-Seagrass-Microbe Interactions on Seagrass Stress Response and Ecosystem Functions
NSF PRFB 2023 财年:环境-海草-微生物相互作用对海草应激反应和生态系统功能的影响
  • 批准号:
    2305691
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Fellowship Award
NSF Postdoctoral Fellowship in Biology: Investigating the role of thermal stress response in facilitating adaptation in camel spiders
美国国家科学基金会生物学博士后奖学金:研究热应激反应在促进骆驼蜘蛛适应中的作用
  • 批准号:
    2305969
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Fellowship Award
MCA: Cellular Responses to Thermal Stress in Antarctic Fishes: Dynamic Re-structuring of the Proteome in Extreme Stenotherms
MCA:南极鱼类对热应激的细胞反应:极端钝温鱼蛋白质组的动态重组
  • 批准号:
    2322117
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
SBIR Phase II: A mesh-free, sling-free, minimally invasive treatment for stress urinary incontinence in women
SBIR II 期:无网、无吊带的微创治疗女性压力性尿失禁
  • 批准号:
    2233106
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Cooperative Agreement
MULTI-STRESS: Quantifying the impacts of multiple stressors in multiple dimensions to improve ecological forecasting
多重压力:在多个维度量化多种压力源的影响,以改进生态预测
  • 批准号:
    NE/Z000130/1
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Research Grant
Sensing the gap: Expressions of crop stress from molecular to landscape scales
感知差距:从分子到景观尺度的作物胁迫表达
  • 批准号:
    MR/Y034252/1
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Fellowship
Role of intestinal serotonin transporter in post traumatic stress disorder
肠道血清素转运蛋白在创伤后应激障碍中的作用
  • 批准号:
    10590033
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
RII Track-4:NSF: Investigation of Stress Induced Birefringence and Refractive Index Changes in Glass for Fabricating Novel Optics
RII Track-4:NSF:用于制造新型光学器件的玻璃中应力引起的双折射和折射率变化的研究
  • 批准号:
    2327218
  • 财政年份:
    2024
  • 资助金额:
    $ 32.8万
  • 项目类别:
    Standard Grant
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了