Heterogeneity, Anisotropy, and Fluctuations in Dense Granular Materials
致密颗粒材料的异质性、各向异性和波动
基本信息
- 批准号:0906908
- 负责人:
- 金额:$ 36.5万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2009
- 资助国家:美国
- 起止时间:2009-06-15 至 2012-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
****NON-TECHNICAL ABSTRACT****Granular materials are ubiquitous: from pharmaceutical powders to breakfast cereals to coal to avalanches, they appear in all aspects of life. These materials can flow or act like a solid, properties that are exploited in countless practical applications. Understanding these materials is extremely important, but such understanding is substantially lacking. This award supports a project that focuses on "jamming" one of the most intriguing and poorly understood properties of these materials: how do they transition between solid-like to fluid-like behavior. Implicated in this process are two disparate phenomena: forces are carried on structures known as force chains, and in response to applied forces, particles move very non-uniformly. A key premise of this work is that these processes are intimately connected. Novel experiments will allow a complete characterization of granular systems and the opportunity to probe these two features and their interconnection. This work will test novel theoretical approaches that may provide a rigorous basis for predicting granular behavior, as well as the behavior of other disordered systems. Outreach/educational components will be integrated into all aspects of this project. These include outreach to area elementary and secondary schools, and training/research opportunities for high school students, undergraduate and graduate students and for post-docs. The PI also works with an international consortium of granular industrial users to help transfer knowledge to practical applications.****TECHNICAL ABSTRACT****Jamming occurs for dense disordered systems: granular materials, the subject of this project, as well as colloids, foams, glasses, etc. This award supports an experimental project that will probe two key aspects of jamming: 1) force anisotropy, and 2) possible connections between force anisotropy, as epitomized by force chains, and spatial dynamical heterogeneity. Although isotropic jamming has been well studied, the case of anisotropic stresses is not understood. This case is particularly important because shear induces flow in dense granular materials. This project will also test emerging statistical theories that could provide a fundamental basis for understanding non-conservative systems such as granular materials. Experiments will involve several novel techniques including 2D and 3D photoelastic methods combined with biaxial, shear, and triaxial devices. Outreach/education will be integrated into all aspects of this project, including: outreach to local schools, and training/research opportunities for high school, undergraduate and graduate students and for post-docs. The PI also works with an international consortium of granular industrial users to help transfer knowledge to practical applications.
* 非技术摘要 * 颗粒状材料无处不在:从药物粉末到早餐谷物,从煤炭到雪崩,它们出现在生活的各个方面。 这些材料可以流动或像固体一样,这些特性在无数的实际应用中得到了利用。 理解这些材料是非常重要的,但这种理解是非常缺乏的。 该奖项支持一个项目,该项目专注于“干扰”这些材料中最有趣且知之甚少的特性之一:它们如何在固体状到流体状行为之间过渡。 在这个过程中涉及到两种不同的现象:力是由称为力链的结构承载的,而作为对作用力的响应,粒子的运动非常不均匀。 这项工作的一个关键前提是,这些过程是密切相关的。 新的实验将允许一个完整的表征颗粒系统和机会来探测这两个功能和它们的相互联系。 这项工作将测试新的理论方法,这些方法可能为预测颗粒行为以及其他无序系统的行为提供严格的基础。 外联/教育部分将纳入该项目的所有方面。 这些措施包括对地区小学和中学的宣传,以及为高中生、本科生和研究生以及博士后提供培训/研究机会。 PI还与国际颗粒工业用户联盟合作,帮助将知识转移到实际应用中。技术摘要 **** 干扰发生在密集无序系统中:颗粒材料,本项目的主题,以及胶体,泡沫,玻璃等。该奖项支持一个实验项目,该项目将探讨干扰的两个关键方面:1)力各向异性,2)力各向异性之间的可能联系,如力链和空间动态异质性的缩影。 虽然各向同性干扰已经得到了很好的研究,但各向异性应力的情况还不清楚。 这种情况是特别重要的,因为剪切诱导流动的致密颗粒材料。 该项目还将测试新兴的统计理论,这些理论可以为理解非保守系统(如颗粒材料)提供基础。 实验将涉及几种新的技术,包括二维和三维光弹性方法结合双轴,剪切和三轴设备。 外联/教育将纳入该项目的所有方面,包括:与当地学校的外联,以及为高中、本科和研究生以及博士后提供培训/研究机会。 PI还与国际颗粒工业用户联盟合作,帮助将知识转移到实际应用中。
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)
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Robert Behringer其他文献
Robert Behringer的其他文献
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{{ truncateString('Robert Behringer', 18)}}的其他基金
Shear Jamming, Diffusion, Reversibility, Anisotropy, and Fluctuations in Dense Granular Materials
致密颗粒材料中的剪切干扰、扩散、可逆性、各向异性和波动
- 批准号:
1206351 - 财政年份:2012
- 资助金额:
$ 36.5万 - 项目类别:
Continuing Grant
Support for US Participants for Symposium on Methods to Predict the Structural and Mechanical Properties of Dense Granular Media, Graz, Austria, July 9-13, 2012
支持美国参与者参加 2012 年 7 月 9 日至 13 日在奥地利格拉茨举行的密集颗粒介质结构和力学性能预测方法研讨会
- 批准号:
1244382 - 财政年份:2012
- 资助金额:
$ 36.5万 - 项目类别:
Standard Grant
Support of an NSF-IFPRI Collaborative Summary Meeting, June 29-July 1, 2011, at the Carolina Inn, Chapel Hill, NC
支持 2011 年 6 月 29 日至 7 月 1 日在北卡罗来纳州教堂山 Carolina Inn 举行的 NSF-IFPRI 合作总结会议
- 批准号:
1138571 - 财政年份:2011
- 资助金额:
$ 36.5万 - 项目类别:
Standard Grant
CDI-Type II: Collaborative Research: Computational Homology, Jamming, and Force Chains in Dense Granular Flows
CDI-Type II:协作研究:密集颗粒流中的计算同源性、干扰和力链
- 批准号:
0835571 - 财政年份:2008
- 资助金额:
$ 36.5万 - 项目类别:
Standard Grant
Collaborative Research: SGER: Measuring Forces in Three-Dimensional Granular Materials
合作研究:SGER:测量三维颗粒材料中的力
- 批准号:
0607751 - 财政年份:2006
- 资助金额:
$ 36.5万 - 项目类别:
Standard Grant
Statistical Properties of Dense Granular Materials: Force Transmission, Jamming and Fluctuations
致密颗粒材料的统计特性:力传递、干扰和波动
- 批准号:
0555431 - 财政年份:2006
- 资助金额:
$ 36.5万 - 项目类别:
Standard Grant
Support for US Participants to Attend the International Conference on Powders and Grains, Stuttgart, Germany, Summer 2005
支持美国与会者参加 2005 年夏季德国斯图加特举行的国际粉末和谷物会议
- 批准号:
0451422 - 财政年份:2005
- 资助金额:
$ 36.5万 - 项目类别:
Standard Grant
Force Propagation and Friction in Granular Materials
颗粒材料中的力传播和摩擦
- 批准号:
0137119 - 财政年份:2002
- 资助金额:
$ 36.5万 - 项目类别:
Continuing Grant
Fluctuations and Flow for Granular Materials
颗粒材料的波动和流动
- 批准号:
9802602 - 财政年份:1998
- 资助金额:
$ 36.5万 - 项目类别:
Continuing Grant
Effects of Spatial Inhomogeneity on Nonlinear Pattern Forming Systems
空间不均匀性对非线性图案形成系统的影响
- 批准号:
9610248 - 财政年份:1997
- 资助金额:
$ 36.5万 - 项目类别:
Continuing Grant
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