Abstract
In order to study the arrangements of yarns on the impact resistance of aramid/epoxy resin composites better, 0°/90°/0°/90° is the basic control group. In addition, three different arrangements are adopted for yarn laying, and the structures are 0°/90°/−45°/45°, 90°/45°/−45°/0°, −45°/0°/90°/45° respectively. In this paper, the interfacial bonding strength of composite materials is tested by yarn pull-out test. Drop hammer impact test is used to observe the impact resistance of composite materials; scanning electron microscopy was used for characterization to investigate the damage mechanism of fiber. The results show that aramid fiber/epoxy resin composites with yarn arrangement order of 90°/45°/−45°/0° have better impact resistance. And its energy absorption is obvious, with a peak value of 5.6 J, which is larger than other structures. In addition, the bonding force and damage mechanisms of internal interfaces of four kinds of aramid/epoxy composites under impact load are analyzed. The same time is taken as the unified variable to judge their respective advantages and disadvantages. The morphology of microscopic damage is used as the basis for judgment, which provides references for the engineering application of materials in structure.
Acknowledgments
The authors sincerely appreciate the support from the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
Disclosure statement
No potential conflict of interest was reported by the author(s).