Formation of microvoids during resin-transfer molding process
Formation of microvoids during resin-transfer molding process
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DOI：
10.1016/s0266-3538(00)00036-1
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发表时间：
2000-09-01
影响因子：
9.1
通讯作者：
Hahn, HT
中科院分区：
文献类型：
--
作者：
Kang, MK;Lee, WI;Hahn, HT
复合材料部件中的空隙是有害的，因为它们降低其强度和模量。在树脂传递模塑（RTM）中，空隙主要由不均匀的纤维结构引起。这种不均匀性导致纤维预制件的不均匀渗透性，这又导致树脂速度在微观尺度上从点到点变化。毛细管压力，这也盛行在这个长度尺度，加剧了树脂速度的空间变化。压力梯度和毛管压力的综合作用可用毛管数来描述。在树脂流动前沿产生的微观扰动允许空隙形成。本文提出了一个数学模型来描述空洞的形成机制。现有的数据被用来验证所介绍的假设。然后，该模型被用来分析新的数据从一维RTM实验。(C)2000爱思唯尔科技有限公司版权所有。
Voids in a composite part are deleterious because they degrade its strength and modulus. In resin-transfer molding (RTM), voids result mainly from inhomogeneous fiber architecture. Such inhomogeneity leads to non-uniform permeability of the fiber preform, which in turn causes the resin velocity to vary from point to point at a micro scale. The capillary pressure, which also prevails at this length scale, exacerbates the spatial variation of the resin velocity. The combined effect of pressure gradient and capillary pressure can be described by the capillary number. The resulting microscopic perturbations in the resin-flow front allow voids to form. The present paper proposes a mathematical model to describe the mechanisms of void formation. The existing data are used to validate the assumptions introduced. The model is then used to analyze new data from one-dimensional RTM experiments. (C) 2000 Elsevier Science Ltd. All rights reserved.