Micromechanics of Interfacial Failure in Composites

本研究计划的目标是建立 可观察和可测量属性之间的关系 微观尺度上的纤维-基体界面， 纤维增强的宏观性能（强度和韧性） 复合材料试样 发展的第一步， 提出的三个（微观，中观和宏观）尺度模型由一个 界面表面的标度不变（分形）表示 基于实验测量。 接下来，所有互锁，粘合 毛细力是在实际的微凸体上确定的 contact. 这些预言得到了实验的证实。 一旦 表面的统计数据（对应于特定的 材料和特定加工）和接触力 确定接触点，有必要研究 系统强度和稳定性。 剥离的开始 和/或摩擦滑动通过应用渗流来确定 理论和自组织临界性。 该计划的所有阶段 将相互一致。 几何学和物理学 潜在的物理现象将被严格对待。

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.