AUTHOR=Miao Yajing , Ni Jiahuan , Zhu Kai , Liu Yizhou , Chang Yu , Gong Zixin , Yang Dan , Zhang Xin 

TITLE=Effect of aramid core-spun yarn on impact resistance of aramid/epoxy composite

JOURNAL=Frontiers in Materials

VOLUME=10

YEAR=2023

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2023.1196156

DOI=10.3389/fmats.2023.1196156

ISSN=2296-8016

ABSTRACT=<p><bold>Introduction:</bold> The surface of aramid filament is smooth, which is a great defect for impact resistance and composite molding of aramid/epoxy composite. In this study, a new type of yarn—aramid core-spun yarn is introduced to the fabrication of compositematerials. It increases the friction among yarns and optimizes the performance of yarns.</p><p><bold>Methods:</bold> To verify the improvement of yarn in the composite material, the hand lay-up process is used, and the first layer and the fourth layer are replaced by core-spun yarns in a four-layer composite configuration.</p><p><bold>Results and Discussion:</bold> The energy absorption, and the damage of the impacted surface and the back surface are evaluated through the drop weight impact test. The yarn pull-out test can reflect the internal friction of fabric. The results show that the average energy absorption of new yarn in the first layer is 10 J cm<sup>2</sup>/g more than that in the fourth layer at a 90°/45°/-45°/0° configuration after the normalization, but the conclusion is contrary when the structure is -45°/0°/90°/45°. Under the structure of 90°/45°/-45°/0°, the damaged area of the fabric is larger when the aramid core-spun yarn is laid on the first layer, while a contrary result can be found for the structure of -45°/0°/90°/45°. The fundamental research will provide design ideas and supports for aramid composite.</p>