Effect of yarns in multiple directions on impact resistance of aramid/epoxy composites

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.

Keywords:

• Composite materials
• structural performance
• energy absorption
• impact resistance

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).

Additional information

Funding

This research was supported by School Start-up Fund Project of Changzhou University (grant number: ZMF21020365), and by 4th Leading Innovative Talents Cultivation Project of Changzhou City (grant number: CQ20210106) and by the research project of MenBo High-tech Jiangsu Co., Ltd (grant number: 2022K3071). Scientific Research Staring Foundation of Shanghai University of Engineering Science (Grant No. 2017-19), Talents Action Program of Shanghai University of Engineering Science (Grant No. 2017RC522017), and Talents Action Program of Shanghai University of Engineering Science (Grant No. 2017RC432017).