EAGER: Constitutive Relations in Amorphous Metals

EAGER：非晶金属的本构关系

• 批准号: 1153590
• 负责人: Mo Li
• 金额: $ 10万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1153590&HistoricalAwards=false
• 关键词: EAGER; Constitutive; Relations; Amorphous; Metals

The research objective of this EArly-concept Grant for Exploratory Research (EAGER) project is to elucidate the fundamental mechanisms and constitutive relations in amorphous metals. Amorphous or metallic glass is a structurally disordered solid without the long-range translational order. This topological disorder leads to some of the most remarkable mechanical properties for this class of materials. In the past decade, extensive research and development have been done to harvest the properties, especially the mechanical properties, which led to several constitutive relations. However, these relations suffer from both conceptual difficulties and lack of critical experimental support. In particular, two constitutive models are going to be tested: one is based on Drucker-Prager criterion and transition state theory; and the second, a new theory for plasticity, is the free energy-based approach. Both FEM and atomistic modeling are planned. The ultimate goal of this research is to establish the constitutive relations among stress, strain, strain rate, temperature, and various physical, structural properties and compositional changes for amorphous solids, which is one of the remaining frontiers in mechanics of materials where no working constitutive model exists to date. This exercise will not only help the scientific community to get closer to more physically justified and working constitutive models for metallic glasses, but will also bring the field a step further toward formulation of deformation in topologically disordered solids in general. Thus this effort is expected to contribute to advancements in the area of mechanics of solids. Associated educational plans will be synergistically integrated with the proposed work.

这个早期概念探索性研究奖助金项目的研究目标是阐明非晶态金属的基本机制和本构关系。非晶态或金属玻璃是一种结构无序的固体，没有长程平移有序。这种拓扑无序导致了这类材料的一些最显着的机械性能。在过去的十年里，人们进行了大量的研究和开发，以获得材料的性能，特别是力学性能，从而产生了几种本构关系。然而，这些关系既存在概念上的困难，也缺乏关键的实验支持。特别是，将检验两个本构模型：一个是基于Drucker-Prager准则和过渡态理论的本构模型；另一个是基于自由能的塑性新理论。设计了有限元模型和原子模型。本研究的最终目的是建立非晶态固体的应力、应变、应变率、温度以及各种物理、结构性质和成分变化之间的本构关系，这是材料力学中到目前为止还没有工作本构模型的领域之一。这项工作不仅有助于科学界更接近金属玻璃的物理上合理和有效的本构模型，而且还将使该领域朝着一般拓扑无序固体中的形变公式进一步迈进一步。因此，预计这一努力将有助于固体力学领域的进步。相关的教育计划将与拟议的工作协同结合。