三维无卷曲机织物成形的中观宏观模拟

Jie Wang, Peng Wang, N. Hamila, P. Boisse
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引用次数: 2

摘要

RTM(树脂传递成型)制造工艺主要用于纺织复合材料的制造。在成型阶段,复合材料增强材料在细观尺度上的变形,如变形纱线的位置、方向和截面的变化,对于计算增强材料在注射阶段的渗透率和评价最终产品的力学行为至关重要。然而,由于纱线数量多,接触复杂,特别是粗增强筋的细观模型计算成本高。本文提出了在合理的计算时间内预测复合材料增强材料细观变形的宏观-细观方法。提出的多尺度方法允许通过宏观-细观嵌入方法将钢筋宏观模拟与RVE(代表性体积单元)的细观建模联系起来。基于三维超弹性本构律的宏观模拟,首先推导了嵌入细观几何。宏细观内嵌解决方案会导致纱线过度伸长。为了克服这一不便,在单个RVE上进行了基于宏细观嵌入分析的局部细观模拟。最后,通过多尺度成形仿真与实验结果对比,验证了所提方法的有效性。
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Meso-Macro Simulations of the Forming of 3D Non-Crimp Woven Fabrics
The RTM (Resin Transfer Molding) manufacturing process is largely used for the fabrication of textile composites. During the forming phase, the deformations of composite reinforcements at the mesoscopic scale, such as the positions, orientations, and changes in the sections of deformed yarns, are essential to calculate the permeability of the reinforcement in the injection phase and evaluate the mechanical behaviors of the final products. However, the mesoscopic models of the forming simulation lead to a high computational cost due to the numerous yarns and their complex contacts, especially for thick reinforcements. In this paper, a macro-meso method for predicting the mesoscopic deformations of composite reinforcements with a reasonable calculation time is presented in this paper. The proposed multi-scale method allows for the linkage of the macroscopic simulation of reinforcements with the mesoscopic modelling of an RVE (Representative Volume Element) through a macro-meso embedded approach. Based on macroscopic simulations using a 3D hyperelastic constitutive law, an embedded mesoscopic geometry is first deduced. The macro-meso embedded solution can lead to excessive extensions of yarns. To overcome this inconvenience, a local mesoscopic simulation based on the macro-meso embedded analysis is carried out on a single RVE. Finally, the multi-scale forming simulations are investigated in comparison with the experimental results, illustrating the efficiency of the proposed method.
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