Gas permeation and viscoelastic deformation of prepregs in composite manufacturing processes
Gas permeation and viscoelastic deformation of prepregs in composite manufacturing processes
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DOI：
10.1002/pc.750160505
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发表时间：
1995-10
影响因子：
5.2
通讯作者：
J. Nam;J. Seferis;S.-W. Kim;K. Lee
中科院分区：
文献类型：
--
作者：
J. Nam;J. Seferis;S.-W. Kim;K. Lee
研究了一种具有粘弹性特性的商品预浸料的气体渗透和蠕变随时间、温度和固结压力的变化规律。使用预浸料堆进行的实验表明，材料在真空/高压釜压力下表现出线性粘弹性体变形，此外，平面内气体流动表现出具有渗透滞后的非达西流动行为。通过两个粘弹性弛豫过程(1)体积尺寸弛豫和(2)微观孔隙结构重排来观察和分析这种行为。采用一种改进的标准线性固体（SLS）粘弹性模型，利用两个独立的松弛参数来解释蠕变柔度和动态渗透率。通过对孔隙大小及其分布的目测，发现空气渗透主要是通过预浸体系的层间孔隙网络进行的。
Gas permeation and creep deformation of a commercial prepreg, which exhibits viscoelastic characteristics, were investigated as a function of time, temperature, and consolidation pressure. Experiments using a prepreg stack demonstrated that the material exhibited a linear viscoelastic bulk deformation under vacuum/autoclave pressure and furthermore, the in-plane gas flow exhibited non-Darcian flow behavior with a permeation hysteresis. This behavior was viewed and analyzed by two viscoelastic relaxation processes : (1) bulk dimensional relaxation, and (2) microscopic pore structure rearrangement. A modified standard linear solid (SLS) viscoelastic model was used to interpret the creep compliance and dynamic gas permeability utilizing two independent relaxation parameters. By visual investigation of pore sizes and their distribution, air permeation was found to take place mostly through the interlaminar porosity network for the prepreg system examined.