Fractal permeation characteristics of preforms used in liquid composite molding
Fractal permeation characteristics of preforms used in liquid composite molding
复制标题
DOI：
10.1002/pc.10185
复制
发表时间：
2000-04
影响因子：
5.2
通讯作者：
B. Ramakrishnan;R. Pitchumani
中科院分区：
文献类型：
--
作者：
B. Ramakrishnan;R. Pitchumani
在复合材料液态成型过程中，预成型件的渗透性在分析充模过程中起着至关重要的作用。由于预制件孔隙网络的复杂结构，孔隙结构的定量描述以及因此的渗透率的评估提出了重大挑战。本文利用基于分形技术的无序预制体孔结构的基本描述，将预制体渗透率与实际微观结构用两个分形维联系起来。分形渗透模型预测与实验测得的渗透率的比较表明，在很宽的范围内的纤维体积分数，注射压力，各向同性和各向异性的预成型体架构的优秀协议。
Preform permeability plays a critical role in the analysis of mold filling during liquid composite molding processes. Because of the complex structure of the preform pore network, a quantitative description of the pore structures, and consequently, the evaluation of the permeabilities presents a major challenge. In this article, a fundamental description of the disordered preform pore structures based on fractal techniques is utilized to relate the preform permeabilities to the actual microstructures in terms of two fractal dimensions. Comparison of the fractal permeation model predictions with experimentally-measured permeabilities demonstrates excellent agreement over a wide range of fiber volume fractions, injection pressures, and isotropic and anisotropic preform architectures.