Modeling of anisotropic dual scale flow in RTM using the finite elements method

Modeling of anisotropic dual scale flow in RTM using the finite elements method
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使用有限元法对 RTM 中的各向异性双尺度流动进行建模

DOI:
10.1016/j.compositesb.2021.108735
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发表时间:
2021
期刊:
Composites Part B: Engineering
影响因子:
--
通讯作者:
Middendorf, Peter
Middendorf, Peter
中科院分区:
--
文献类型:
--
作者:
Facciotto, Silvio;Simacek, Pavel;Advani, Suresh G.;Middendorf, Peter

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在液体复合材料模塑(LCM)过程中,织物增强件被放置在一个封闭的型腔中,树脂被注入模具中。几乎所有的增强体都是含有双鳞片的光纤丝束,其填充速度与光纤丝束之间的区域不同。对LCM过程的模拟可以帮助识别无法填充的区域。然而,双尺度流的存在通常被忽略。这里使用液态注射成型模拟(LIMS)软件来模拟这一现象,在该软件中创建了一个由一维单元组成的复杂网络。这使得我们能够模拟横向和纵向流动通过纤维丝束,考虑到增强体的方向和结构,此外,还向模型添加了毛细效应。进行了一项敏感性研究,以考察无量纲形式的性质的影响,允许与通过可视化流动前沿位置和双尺度区域尺寸来验证该模型的实验进行比较。
In Liquid Composite Molding (LCM) processes, a fabric reinforcement is placed in a closed cavity and resin is injected into the mold. Almost all reinforcements are dual scale containing fiber tows, which fill at a different rate than the region in between the fiber tows. Simulation of LCM processes can help identify regions that fail to fill. However, the presence of dual scale flow is usually neglected. Here this phenomenon is modeled using Liquid Injection Molding Simulation (LIMS) software in which a complex network of one-dimensional elements is created. This allowed us to simulate transverse and longitudinal flow through the fiber tows taking into consideration the orientation and architecture of the reinforcement and, additionally, adding capillary effects to the model. A sensitivity study has been performed to investigate the effects of properties in non-dimensional form, allowing for comparison with experiments that were conducted to validate the model by visualization of the flow front position and dual scale area dimensions.
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