Micromechanics of High-Temperature Deformation of Metal-Matrix Composites and Porous Materials

金属基复合材料和多孔材料高温变形的微观力学

• 批准号: 9114745
• 负责人: George Weng
• 金额: $ 8万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114745&HistoricalAwards=false
• 关键词: Micromechanics; Temperature; Deformation; Metal; Matrix

High-temperature deformation of metal-matrix composites will be studied from the micromechanics standpoint. The study will also include the influence of distributed damage in the ductile matrix on the overall time-dependent behavior of the material. Guided by the observations that most metallic constituents may undergo both primary and secondary creep in addition to the usual elastic deformation, and that the creep rate usually depends on stress nonlinearly, the following four specific problems will be examined: (1) stress-strain relation of the composite under a constant strain rate, (2) higher creep strain range, and (4) the extension to a higher particle or fiber concentration. These studies will be carried out with a special reference to the practical and potential service environments. Whenever possible, simple macroscopic constitutive theories which can reflect the essential features of these micromechanical considerations will be developed for design and analysis. The aim is to translate this scientific knowledge into use, so that the microstructures which would provide the strongest creep resistance under the service conditions could be identified.

金属基复合材料的高温变形将是 从微观力学的角度来研究。 该研究还将 包括韧性基体中分布损伤的影响 材料的整体时间依赖性行为。 指导 大多数金属成分都可能经历 除了通常的弹性蠕变外， 蠕变速率通常取决于应力 非线性，将审查以下四个具体问题： (1)恒应变下复合材料的应力-应变关系 速率，（2）更高的蠕变应变范围，以及（4）延伸到 更高的颗粒或纤维浓度。 这些研究报告将 特别提到了实际和潜在的 服务环境。 只要有可能，简单的宏观 本构理论，可以反映的本质特征， 这些微机械方面的考虑将在设计中得到发展 和分析 目的是将这些科学知识 使用时，使微结构， 在使用条件下最强的抗蠕变性， 鉴定