Void formation in geometry–anisotropic woven fabrics in resin transfer molding
Void formation in geometry–anisotropic woven fabrics in resin transfer molding
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DOI：
10.1080/09243046.2013.832829
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发表时间：
2014-01
影响因子：
2.9
通讯作者：
R. Matsuzaki;D. Seto;A. Todoroki;Y. Mizutani
中科院分区：
文献类型：
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作者：
R. Matsuzaki;D. Seto;A. Todoroki;Y. Mizutani
当将纤维束的厚度和宽度分别在经向和纬向不同的几何各向异性织物用于树脂传递模塑(RTM)时，流动路径上的微观多孔结构可能取决于树脂流动方向。本文研究了机织物的几何各向异性对RTM过程中流动前沿气泡形成的影响。测量了经(窄而粗)和纬向(宽而细)定向浸渍过程中孔隙率与树脂流动速度的关系。实验表明，在一定的树脂流动速度下，经向浸渍比纬向浸渍具有更高的孔洞形成临界树脂流动速度和孔洞含量。毛细管指进对孔洞的形成也有很大的影响，翘曲方向的浸渍表明指进形成的临界流速较高。这可能是因为纤维束与模具表面在经纱方向上的间隙较小，因此毛细作用力较大，与纬向浸渍相比，有利于指进。此外，这可能导致较高的孔洞形成临界速度和较高的孔洞含量在给定的流动速度下的经向浸渍。
When geometry–anisotropic fabrics, in which the thickness and width of fiber bundles differ in the warp direction and weft direction, respectively, are used for resin transfer molding (RTM), microscopic porous structures along a flow path may depend on the resin flow direction. This study investigated the influence of woven fabrics’ geometric anisotropy on inter-bundle void formation due to air entrapment at the flow front during RTM. The void content–resin flow velocity relationship was measured in warp (narrow and thick bundle) and weft (wide and thin bundle) directional impregnation. In experiments, warp directional impregnation indicated higher critical resin flow velocity of void formation and void content under a given resin flow velocity than in weft directional impregnation. Void formation was also largely affected by capillary fingering, where warp directional impregnation indicated a higher critical flow velocity of fingering formation. This may be because the gap between the fiber bundle and the mold surface is smaller in the warp direction; thus, the capillary force is higher, and fingering is facilitated compared with weft directional impregnation. Additionally, this may lead to a higher critical velocity of void formation and higher void content at a given flow velocity in warp directional impregnation.