MICRO-GEOMETRY OF 3D ORTHOGONAL WOVEN FABRIC MODELING UNDER DIFFERENT YARN TENSION

Abstract

Abstract: The unit cell topology of the 3d orthogonal weave fabric is established with circular initial yarn cross-section shape based on the weaving pattern. Then, periodic boundary and constant tension are applied at yarn ends using the Digital Element Approach (DEA). Each yarn is discretized into a predetermined number of digital fibers. As a result, the yarn cross-section shape and its spatial configuration is changed through the dynamic weaving process simulation. The results show that due to a relatively large warp and weft tension in comparison to a small weaver tension, the thickness of the warp and weft yarns of the numerical model is uniform and the geometry of which remains to be straightness. The cross-section shape of the weaver is consistent with that of the microscopic image. When the applied tension of warp, weft, and weaver yarns is 0.2 N, 0.2 N, and 0.01 N respectively, the thickness of the numerical model is only 9.55% less than that of the experimental one. The micro-geometry of the numerical model matches perfectly with the microscopic images. The simulation results validated the DEA in determining the micro-geometry of 3d woven fabric at sub-yarn scale.

Key words: 3D orthogonal woven fabric, sub-yarn scale modeling, yarn tension, digital element approach, periodic boundary conditions, composites

CLC Number:

TB332

LIU Yue-yan, MA Ying, LU Sheng, DENG Cong-ying, CHEN Xiang, ZHAO Yang. MICRO-GEOMETRY OF 3D ORTHOGONAL WOVEN FABRIC MODELING UNDER DIFFERENT YARN TENSION[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(1): 19-27.

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