Abstract: In this work, PP (64tex) filaments were wrapped in the flax (33tex) surface to form PP/flax covered yarn. The covered yarns were used to weave three typical 2.5D woven fabrics(deep crossing linking, straight shallow-crossing linking and the curved one) on SU111 type automatic rapier loom. Then those woven fabrics were made into PP/ flax composites by hot pressing in the Carver hot-pressing equipment. The low-velocity impact performance of 2.5D woven composites (thickness was 1mm, fiber volume content is 48%)was texted. The results showed when the curved shallow-crossing linking composites resist to low speed impact, the biggest load(575.1N) was bigger than others, while the biggest load of deep crossing linking composites(301.74) was the smallest. When the curved shallow-crossing linking composites resisted to low speed impact, it absorbed the most energy(0.816J), while the biggest load of deep crossing linking composites(0.773) was the least.

Key words: 2.5D woven composites, low-velocity impact performance, curved shallow-crossing linking, straight shallow-crossing, deep crossing linking