Modeling formation and evolution of voids in unsaturated dual scale preforms in Resin Transfer Molding processes
Modeling formation and evolution of voids in unsaturated dual scale preforms in Resin Transfer Molding processes
复制标题
模拟树脂传递模塑工艺中不饱和双尺度预成型件中空隙的形成和演变
DOI：
10.1016/j.compositesa.2023.107675
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Middendorf, Peter
中科院分区：
文献类型：
--
作者：
Facciotto, Silvio;Simacek, Pavel;Advani, Suresh G.;Pickett, Anthony;Middendorf, Peter
树脂传递模塑(RTM)是一种复合材料加工技术，将纤维预制件(通常由编织或缝合在一起的纤维束组成)封闭在两个或多个刚性模具之间的空腔中，然后在压力下注入树脂，以填充纤维之间的所有空隙。在这一过程中，预制棒表现出双重尺度行为，因为纤维丝束中纤维之间的气孔比丝束之间的间距小得多，因此树脂以不同的速度浸渍丝束间和丝束内的气孔。在这项研究中，这种双重尺度的行为和空洞演化是通过多尺度方法来模拟的，以预测在制造的复合材料中空洞的位置和分布。在模拟工作中，通过引入代表光纤丝束网络的一维从属单元来表示预制件的双尺度行为。这是对分为两种类型的玻璃纤维预制件的总共五种不同的铺层进行的。然后，在宏观模型中计算的压力和双尺度结果被用作介观模型的输入，在介观模型中，区域由光纤丝束和它们之间的间隙组成。通过局部修改渗透率的值来考虑毛细效应。使用带有摄像头的透明模具，可以在介观水平域上比较丝束的双尺度流动和饱和度。
Resin transfer molding (RTM) is a composite processing technique in which a fiber preform (usually consisting of fiber tows woven or stitched together) is enclosed in a cavity between two or more rigid molds before injecting resin under pressure to fill all empty spaces between the fibers. In this process preforms exhibit dual scale behavior as the pores between the fibers in a fiber tow are much smaller than the spaces between tows, hence the resin impregnates the inter- and intra-tow pores at different rates. In this research this dual scale behavior and void evolution is modeled through a multi scale approach to predict void location and distribution in a manufactured composite. For the simulation work dual scale behavior of the preform is represented by introducing one dimensional slave elements representing the network of fiber tows. This was conducted for a total of five different layups divided between two types of glass fiber preforms. The pressure calculated in the macroscopic model, and the dual scale results are then used as input in a mesoscopic model, in which the domain consists of fiber tows and gaps between them. Capillary effects are taken into account by locally modifying the values of the permeability. The use of a transparent mold with cameras allowed a comparison of dual scale flow and saturation of the tows at the mesoscopic level domain.