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A shell model for resin flow and preform deformation in thin-walled composite manufacturing processes
International Journal of Material Forming ( IF 2.4 ) Pub Date : 2019-12-17 , DOI: 10.1007/s12289-019-01517-z
Da Wu , Ragnar Larsson

The paper proposes a novel approach to model the in-plane resin flow in deformable thin-walled fiber preforms for liquid composite molding processes. By ignoring the through-thickness flow in large scale thin-walled components, the 3-D resin flow is simplified to an in-plane flow inside the preform by a specialized divergence theorem. Shell kinematics are used to describe the fiber preform deformation, and the compressible flow is modeled in the context of the free surface flow in porous media. For simplicity and efficiency, the normal stretch, which is driven by the internal fluid and applied external pressure, represents the fiber preform expansion and compression. As compared with full 3-D models, the proposed shell model significantly reduces the problem size, while it still represents the primary physical phenomena during the process. The effects of neglecting the through-thickness flow are illustrated in a numerical example that compares the flow for a set of preforms with different thickness. The model is demonstrated from the numerical example of the mold filling in a doubly curved thin-walled fiber preform. Due to the applied vacuum and the consequent resin flow motion, the relevant deformation of the preform is observed.



中文翻译:

薄壁复合材料制造过程中树脂流动和瓶坯变形的壳模型

本文提出了一种新颖的方法来模拟平面内树脂在可变形薄壁纤维预成型坯中的流动,以进行液体复合成型工艺。通过忽略大型薄壁部件中的厚度流,通过专门的发散定理,将3-D树脂流简化为预成型坯内部的平面内流。壳运动学用于描述纤维预成型件的变形,可压缩流是在多孔介质中自由表面流的背景下建模的。为了简化和提高效率,由内部流体和施加的外部压力驱动的正常拉伸表示纤维预成型坯的膨胀和压缩。与完整的3D模型相比,建议的外壳模型显着减小了问题的大小,同时仍代表了过程中的主要物理现象。在一个数值示例中说明了忽略整个厚度流的影响,该示例对一组厚度不同的预成型坯的流进行了比较。该模型是通过将模具填充到双弯曲薄壁纤维预型件中的数值示例进行演示的。由于施加的真空和随之而来的树脂流动运动,观察到预型件的相关变形。

更新日期:2019-12-17
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