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MESO-MACRO SIMULATIONS OF TEXTILE COMPOSITE FORMING

机译:纺织复合材料成形的细观模拟

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Composite textile reinforcement draping simulations aid in determining the processing conditions for a quality part and in finding the positions of the fibers after forming. This last point is essential for the structural computations of the composite part and for resin injection analyses in the case of LCM processes. Because the textile composite reinforcements are multiscale materials, continuous (macro) approaches and discrete (meso) approaches that model the yarns have been developed. The finite element that is proposed in this paper for textile fabric forming is composed of woven unit cells. The mechanical behaviour of these is analyzed by 3D computations at the mesoscale. The warp and weft directions of the woven fabric can be in an arbitrary direction with respect to the direction of the element side. This is very important in the case of multi-ply deep drawing and when using remeshing. The element is efficient because it is close to the physics of the woven cell while avoiding the very large number of unknowns in the discrete approach. A set of validation tests and forming simulations on single-ply and multi-ply fabrics is presented and shows the efficiency of the approach.
机译:复合织物补强悬垂模拟有助于确定优质零件的加工条件,并帮助确定成型后纤维的位置。最后一点对于复合零件的结构计算和LCM工艺情况下的树脂注射分析至关重要。由于织物复合材料增强材料是多尺度材料,因此已经开发出了模拟纱线的连续(宏观)方法和离散(中观)方法。本文提出的用于织物成形的有限元由机织单元构成。通过中尺度的3D计算分析了这些材料的机械性能。织布的经线和纬线方向可以相对于元件侧的方向为任意方向。这对于多层深冲和使用重塑时非常重要。该元素之所以有效,是因为它与编织单元的物理性质很接近,同时又避免了离散方法中的大量未知数。提出了一组在单层和多层织物上的验证测试和成型模拟,并显示了该方法的效率。

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