Experimental and Theoretical Model Study of Response and Failure Modes of Brittle Solids with Microdefects

含微缺陷脆性固体响应和失效模式的实验和理论模型研究

• 批准号: 8615361
• 负责人: Sia Nemat-Nasser
• 金额: $ 16.65万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-02-01 至 1990-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8615361&HistoricalAwards=false
• 关键词: Experimental; Theoretical; Model; Study; Response

The research addresses a key issue in damage mechanics of brittle solids and plans to develop a new approach utilizing micromechanics concepts to understand the fracture and damage characteristics of brittle materials including granular solids and concrete. The research plan includes experimental and theoretical investigations of inelastic response and failure mechanisms of materials which contain specific microdefects. Controlled model experiments will be conducted where the geometry and other characteristics of the defects that produce micro cracking and inelastic flow are prescribed. This procedure will allow the observation of the evolution of the microstructure in the course of deformation. This will provide quantitative estimates of the macroscopic parameters which characterize stresses and strains. Model analyses will be performed utilizing rigoroud mechanics. Theoretical models will be developed and verified by experimental observations. The Principal Investigator is in intetnationally recognized expert in fracture mechanism of brittle and granular solids. The institution has an excellent laboratory facility to conduct this research. An award is recommended.

这项研究解决了脆性固体损伤力学中的一个关键问题，并计划开发一种新的方法，利用细观力学的概念来理解包括颗粒固体和混凝土在内的脆性材料的断裂和损伤特征。该研究计划包括对含有特定微缺陷的材料的非弹性响应和破坏机理的实验和理论研究。将进行受控模型实验，其中规定了产生微裂纹和非弹性流动的缺陷的几何和其他特征。这一过程将使观察变形过程中组织的演变成为可能。这将提供表征应力和应变的宏观参数的定量估计。模型分析将使用严格的力学方法进行。理论模型将被开发出来，并通过实验观测来验证。首席研究员是国际公认的脆性和粒状固体断裂机理专家。该机构拥有一流的实验室设施来进行这项研究。建议设立一个奖项。