A study of the dissipative behavior of geomaterials undergoing large deformations

岩土材料大变形耗散行为研究

基本信息

批准号：
9987677
负责人：
Kumbakonam Rajagopal
金额：
$ 6.22万
依托单位：
Texas A&M Engineering Experiment Station
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2000
资助国家：
美国
起止时间：
2000-03-15 至 2002-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9987677&HistoricalAwards=false
关键词：
study dissipative behavior geomaterials undergoing

项目摘要

Abstract9987677The understanding of the response of geomaterials such as soils and rocks is crucial in addressing a variety of problems in geotechnical engineering, environmental engineering, transportation, building and construction technology. Attempts to describe the response of such materials are adaptations of classical plasticity and mixture theory. Recently, a general framework has been developed to study a diverse class of dissipative processes such as slip, twinning, phase transition, and damage in polymer networks. The objective of this award is to generalize the theory further to include the dissipative response of geomaterials.The main features of the theory are: it takes into account the fact that many materials can exist in more than one natural configuration and that, at a given instant, the response is determined by the deformation gradient from all these configurations, giving the material its mixture-like characteristics; when these materials undergo dissipative processes, the underlying natural configurations invariably change; the evolution of the natural configurations is determined in general by a thermodynamic criterion; the material has various means of storing energy; different types of response can be activated if certain thermodynamic criteria are met; and once a particular mechanism is activated, it might be necessary to prescribe the evolution for the mechanism.

摘要9987677对土壤和岩石等土地材料的反应的理解对于解决岩土工程，环境工程，运输，建筑和建筑技术的各种问题至关重要。尝试描述这种材料的反应的尝试是经典可塑性和混合理论的适应。最近，已经开发了一个通用框架来研究聚合物网络中的一类耗散过程，例如滑移，孪晶，相变和损害。该奖项的目的是进一步概括理论，包括地材料的耗散响应。该理论的主要特征是：它考虑到以下事实：许多材料可以以一种以上的自然构型存在，并且在给定的瞬间，响应是由所有这些配置的变形梯度确定的，从而使材料具有材料，从而提供了其混合特性；当这些材料经历耗散过程时，潜在的自然构型总是会改变。自然构型的演变通常由热力学标准确定。该材料具有多种存储能量的方法；如果满足某些热力学标准，则可以激活不同类型的响应。一旦激活了特定的机制，可能有必要规定该机制的演变。