The effect of mosaic pattern and winding angle on radially compressed filament-wound CFRP composite tubes

Abstract

In this paper, the two key parameters of the filament winding technology process are investigated using both experimental and numerical approaches. While the winding angle is a commonly discussed issue, the mosaic pattern is widely disregarded. To examine its influence, nine configurations of the tubular specimens were manufactured (three winding angles and three mosaic patterns). The novelty of the work is that special attention was paid during the manufacturing process to produce comparable one-layered tubular specimens with 100% degree of coverage, which was so far disregarded in the literature. The radial compression test according to ASTM D2412 was performed. Numerical simulations in the elastic regime were carried out using the finite element method (FEM) as a reference for the experimental results. The calculations of corrected stiffness showed a statistically significant difference between the mosaic patterns for a particular winding angle. Compared to the basic mosaic pattern 1/1, for 45° winding angle the growth was 6.3% and 20.9%, for 55° it was 25.1% and 32.2%, and for 75° the increase was 16.5% and 13.5%, for 2/1 and 3/1 mosaic pattern in each winding angle, respectively. Scanning electron microscopy (SEM) revealed characteristic fracture modes depending on the mosaic pattern and winding angle.