Abstract
Abstract In the present study, the fiber-bending around the needle during the piercing process of the carbon fabric is investigated. In this regard, a mathematical model is established to investigate the bending elongation of the carbon fiber around the needle and the interaction between the carbon fiber and the needle tip. Then the mechanical behavior of the carbon fabric when moving down the tip of the steel needle is analyzed. Based on the performed analysis, a shape curve equation that satisfies the puncture needle tip is established. Furthermore, the influence of different needle tip shapes on the mechanical behavior of the carbon fiber is analyzed. The performance of the needle tip is subjected to different loads, including the puncture template, horizontal tension of the fiber to the needle tip, frictional resistance between the fiber and the needle tip, sliding force, and the bending moment. The performed analysis shows that when the shape of the needle tip assumes the form of curve 10, the downward force, horizontal tension, friction resistance, sliding force, and bending moment are minimized. Accordingly, curve 10 is proposed as the optimal shape for the needle tip. The present study is expected to provide theoretical guidance for selecting overall puncture process parameters.
Highlights
Integral puncture has been proposed as an innovative processing technique in the production of weaving three-dimensional fabrics
It is observed that the downward force, horizontal tension, friction resistance, sliding force, and bending moment at 1,001 points where the needle tip contacts the fiber corresponding to different needle tip shape curves vary with the diameter of the needle tip
In the present study, based on the analysis of the principle of the puncture of the carbon fiber fabric by the needle tip and to ensure the smooth progress of the overall puncture process, 14 curve equations satisfying the shape of the puncture steel needle tip are selected
Summary
Integral puncture has been proposed as an innovative processing technique in the production of weaving three-dimensional fabrics. When the tip of the steel needle pierces the carbon fiber fabric, a series of complex movements and effects appear in the fabric; these originate from the puncture action of the steel needle Analyzing these movements can improve the overall puncture process, optimize the structure of the carbon fiber fabric, and improve the puncture performance. Carbon fabric damage and needle tip damage are the main factors affecting the quality of the punctured fabric [1,2,3] In this regard, scholars established a mechanical model of the steel needle tip in the top bending mode of the woven fabric, solved the corresponding differential equations subjected to appropriate boundary conditions, and calculated the critical pressure of the tip [4, 5]. The main novelty of the present study lies in its consideration of the interaction between the needle and fibers and optimization of the shape of the needle tip
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