头发纤维/环氧树脂微滴脱粘测试：鳞片效应

通过纤维拉出的微滴脱粘测试实验,研究了头发纤维顺鳞和逆鳞方向拉出时的界面强度、失效模式和摩擦机制。通过分析拉伸载荷-位移曲线,给出了头发纤维/环氧树脂界面强度,发现逆鳞方向拉出的界面强度远大于顺鳞方向的强度。通过扫描电子显微镜对失效样品表面形貌分析证实,顺鳞方向拉出发生界面脱粘失效,而逆鳞方向拉出主要发生基体破坏失效模式。另外,与顺鳞方向拉出的稳定摩擦阶段不同,逆鳞方向拉出表现出振荡摩擦现象,最后发展了头发鳞片与残留树脂的相互作用微观模型来解释这种振荡摩擦现象。

Droplet Debonding Test of Hair Fiber/Epoxy: Cuticle Effect

Through droplet debonding test of pulling fiber, the interface strength, the failure mode and the friction mechanism of human hair were studied as fiber pulled along growing direction and inverse growing direction, respectively. By analyzing the tensile load-displacement curve, the interface strength of hair fiber/epoxy was obtained. It reveals that the interface strength of hair fiber and epoxy system along inverse growing direction is far greater than that of along growing direction. Analysis of failure sample surface morphology by using scanning electron microscopy confirms that the interface debonding failure mode occurs when fiber is pulled along hair growing direction, while the matrix failure mode appears when fiber is pulled along inverse growing direction. These different failure modes behave different friction phenomena. A stable friction occurs as the fiber is pulled along hair growing direction; however, an oscillating friction appears as the fiber is pulled along inverse growing direction. An interaction model of hair cuticle, resin residue and matrix maybe is a reasonable explanation for the oscillating friction phenomenon.