纤维搭桥技术在界面微观力学研究中的应用

Applications of Fiber Bridging Technique in Interfacial Micromechanics

界面在纤维增强复合材料中具有非常重要的作用,只有几十纳米到几十个微米的界面区域是复合材料的薄弱区域,严重影响复合材料的力学性能。通过微尺度实验力学研究微观结构与界面微观力学、宏观断裂性能之间的关系,有助于从微观角度解释复合材料界面应力传递和界面脱粘失效机理,从而为实际的纤维补强提供理论指导。显微共聚焦拉曼光谱是首选的界面微观力学研究方法。本文详细介绍了拉曼光谱在纤维搭桥技术中的应用,并重点从搭桥过程中纤维的架桥力、架桥纤维的止裂作用和界面应力传递三个方面综述了裂缝/架桥纤维的交互微力学。

The interface plays a particularly important role in fiber-reinforced composite materials.The interface region with a few nanometers to tens of microns is the weak area in the composite materials and seriously affects the mechanical properties.The mechanisms of the interfacial stress transfer and the interfacial debonding can be investigated by micro-scale experimental mechanical methods which explore the relationships among microstructure,interfacial micromechanics and macroscopic fracture.As a preferred method,micro-Raman spectroscopy has been applied to study the interfacial micromechanics and the fiber bridging technique is also introduced in detail.The bridging stress,the crack propagation and the interfacial stress transfer are mainly discussed and the micromechanics of crack/bridging fiber is finally summarized.