关键词: 缝合, 复合材料, PRSEUS, 低速冲击性能, 有限元模拟

Abstract: As a typical structural unit for wing-fuselage fusion layout, the PRSEUS structure is subjected to complex loading conditions. The use of stitching technology to integrate the reinforced structure with the skin can improve the load transfer capability of the fuselage, improve the overall consistency of the PRSEUS structure, and give full play to the loading efficiency of the PRSEUS structure. By preparing stitched PRSEUS components under existing conditions and carrying out experimental studies of low velocity impact, it was found that the increase of either stitch density or stitch fineness can improve the impact resistance of the specimens, and the impact resistance improvement brought by the increase in stitch fineness was relatively small compared to the increase in stitch density. The impact resistance performance of PRSEUS structure is more sensitive to the stitching density. The results of finite element analysis showed that the interlayer properties of the stitched specimens were significantly improved and the damage area was reduced, which proved that stitching can effectively improve the impact resistance of PRSEUS structures.

Key words: stitching, composite materials, PRSEUS, low-speed impact performance, finite element simulation