Abstract
Tubular braided composites combine manufacturing technologies from textiles and composites industries. The design of the reinforcing textile structure plays a significant role in the mechanical characteristics of the final composite. Twisted yarns have shown improved strength over untwisted ones, even for continuous multifilament yarns where twist is not necessary for the manufacturing process. In this work, a manufacturing process is piloted in which twisted yarns are introduced to the braiding process. Static testing is then done to determine the impact of yarn twist on the stiffness and strength. Finally, the Ramberg–Osgood model is adapted to the results in order to provide a descriptive model for the behavior of tubular braided composites beyond the proportional limit.
Highlights
Previous works on two-dimensional tubular braided composites (TBCs) production and experimentally assessed tensile properties have shown significant variability in the results and lower-than-predicted properties.[1,2] Some of the leading causes of these variabilities are thought to be related to final product architecture such as unit cell, strand fraying, inaccurate strand cross-section assumptions, yarn twist, and many more.[3,4,5] Twisted yarns have shown to be advantageous in textile manufacturing processes.[6]
Samples were grouped by twist treatment and analyzed using a single-factor analysis of variance (ANOVA) with Tukey’s post hoc honest significant difference (HSD) test where appropriate
Load capacity is not directly comparable to strength, but similar, previous analytical models of plain weave composites have predicted no significant change in strength when using twisted strands,[11] but these results show otherwise
Summary
Previous works on two-dimensional tubular braided composites (TBCs) production and experimentally assessed tensile properties have shown significant variability in the results and lower-than-predicted properties.[1,2] Some of the leading causes of these variabilities are thought to be related to final product architecture such as unit cell, strand fraying, inaccurate strand cross-section assumptions, yarn twist, and many more.[3,4,5] Twisted yarns have shown to be advantageous in textile manufacturing processes.[6] In the case of TBCs, no work to date has been done to show the impact of including yarn twist in the manufacturing process of TBCs. this study aims to quantify the impact of twisted yarns on some key mechanical properties of these materials as well as explore a means of modeling the impacted behavior This study aims to quantify the impact of twisted yarns on some key mechanical properties of these materials as well as explore a means of modeling the impacted behavior.
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