Study on the bending performance of three-dimensional braided composite hat-stiffened single-ribbed panels

doi:10.19936/j.cnki.2096-8000.20251028.015

Abstract

Abstract: Preforms of hat-stiffened single-ribbed structures with skin-to-stringer braiding row ratios of 3∶5, 4∶4, 5∶3, and 6∶2 were fabricated using three-dimensional (3D) braiding technology. It is then cured by the vacuum assisted resin transfer molding (VARTM) process. The influence of variations in the number of braiding rows between the skin and the stringer on the bending performance and failure process of 3D braided hat-stiffened single-ribbed panels is analyzed through four-point bending tests combined with three-dimensional digital image correlation (3D-DIC). The results indicate that the panel with a braiding row ratio of 4∶4 exhibits the highest load-bearing capacity, while the panel with a ratio of 3∶5 demonstrates the best resistance to bending deformation. During bending,stress concentration and cracking occur at the interface between the web and flange of the 3D braided hat-stiffened single-ribbed panel. The cracking at this junction has no significant impact on the overall load-bearing capacity,and the reduction in load-bearing capacity of the ribbed panel is primarily caused by brittle fracture of the skin. These findings provide a reference for the structural design of 3D braided hat-stiffened single-ribbed panels.

Key words: three-dimensional braided composites, stiffened panel, hat-shaped stiffener, four-point bending, 3D-DIC(three-dimensional digital image correlation

CLC Number:

TB332

LUO Hui, LI Qianqian, LI Wei. Study on the bending performance of three-dimensional braided composite hat-stiffened single-ribbed panels[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(10): 97-104.

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