Effects of weft yarn deflection angle in the thickness direction on the warp-direction tensile mechanical behavior of 2.5D woven composites

doi:10.19936/j.cnki.2096-8000.20250928.010

Abstract

Abstract: 2.5D woven composites demonstrate promising application prospects in aerospace and other fields due to their excellent integral structural characteristics. However, the deflection characteristics of weft yarns in the thickness direction of preforms lead to more complex mechanical properties and failure mechanisms, significantly limiting their widespread application in engineering fields. This study focuses on typical 2.5D woven T300/QY8911-Ⅳ composites. By establishing unit-cell models with weft yarn deflection angles of 0°, 5° and 20°, and incorporating the 3D Hashin failure criterion and Mises failure criterion, a progressive damage model for 2.5D woven composites was developed to systematically investigate the warp-direction tensile mechanical behavior under different deflection angles. The results indicate that as the weft yarn deflection angle increases, the warp-direction tensile strength of 2.5D woven composites shows a trend of first increasing and then decreasing. This research provides theoretical foundations for the structural design and engineering applications of 2.5D woven composites, holding important practical engineering significance.

Key words: 2.5D woven composites, weft yarn deflection angle, unit-cell model, progressive damage

CLC Number:

TB332

JIANG Pengfei, LI Lei, ZHANG Yifan. Effects of weft yarn deflection angle in the thickness direction on the warp-direction tensile mechanical behavior of 2.5D woven composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(9): 75-83.

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