Micromechanics of Interfacial Failure in Composites

复合材料界面失效的微观力学

• 批准号: 9114329
• 负责人: Dusan Krajcinovic
• 金额: $ 24万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-15 至 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114329&HistoricalAwards=false
• 关键词: Micromechanics; Interfacial; Failure; Composites

The objective of this research program is to establish the relationship between the observable and measurable properties of the fiber-matrix interfacial surface on the micro-scale and the macro-properties (strength and toughness) of a fiber reinforced composite specimen. The first step in the development of the proposed three (micro, meso and macro) scale model consists of a scale invariant (fractal) representation of the interfacial surface based on experimental measurements. Next, all interlock, adhesive and capillary forces are determined on the asperities in actual contact. These predictions are corroborated by experiments. Once the statistics of the surface (corresponding to particular materials and specific processing) and contact forces on the contact spots are determined it becomes necessary to study the strength and stability of that system. The onset of debonding and/or frictional slip is determined applying the percolation theory and self-organizing criticality. All phases of this program will be mutually consistent. Geometry and physics of the underlying physical phenomena will be rigorously treated.

本研究计划的目的是建立纤维-基体界面表面在微观尺度上的可观察和可测量性能与纤维增强复合材料试样的宏观性能（强度和韧性）之间的关系。提出的三（微观、中观和宏观）尺度模型的第一步是基于实验测量的界面表面的尺度不变（分形）表示。其次，所有的联锁力，粘接力和毛细力都是在实际接触中确定的。实验证实了这些预测。一旦确定了表面的统计数据（对应于特定的材料和特定的加工）和接触点上的接触力，就有必要研究该系统的强度和稳定性。脱粘和/或摩擦滑移的开始是应用渗透理论和自组织临界性来确定的。该计划的所有阶段将相互一致。几何和物理的基础物理现象将严格处理。