Assessment of capillary phenomena in liquid composite molding

被引：39
作者：
Caglar, Baris [1 ]
Tekin, Cem [1 ]
Karasu, Feyza [1 ]
Michaud, Veronique [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, LPAC, Inst Mat IMX, Stn 12, CH-1015 Lausanne, Switzerland
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2019年 / 120卷
关键词：
Wettability; Transport phenomena analysi; Liquid composite molding; Surface treatments; PLASMA SURFACE-TREATMENT; RAY COMPUTED-TOMOGRAPHY; VOID FORMATION; FIBER COMPOSITES; POLYMER COMPOSITES; AXIAL IMPREGNATION; FLOW BEHAVIOR; JUTE-FIBER; PERMEABILITY; PRESSURE;
D O I：
10.1016/j.compositesa.2019.02.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The interplay between capillary and viscous forces plays a significant role for optimal part quality in fiberreinforced composites manufactured by Liquid Composite Molding (LCM); these are however difficult to analyze during flow. Two approaches are proposed in this study: (i) a woven glass fabric's surface was modified by corona treatment to improve its wetting characteristics without altering its permeability, (ii) flow of a UV-curable resin was stopped during LCM by fast radiation cure. Capillary rise experiments and unsaturated/saturated permeability measurements confirmed the wetting improvement by corona treatment. Flow front morphology analysis of cured pristine and treated fabrics, processed under various pressure differentials, revealed the enhancement of dual-scale flow at capillary-dominated regime and improvement of infra-tow flow in viscous-dominated regime. Furthermore, the obtained results provide insight into the so-called optimal capillary number to attain the minimal void content in composites and its alteration by surface treatment of fiber reinforcements.
引用
收藏
页码：73 / 83
页数：11
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