The influence of fiber volume fraction and fiber length on the evolution of pore content and the paintability of sheet molding compounds
The influence of fiber volume fraction and fiber length on the evolution of pore content and the paintability of sheet molding compounds
复制标题
DOI：
10.1016/j.compositesb.2020.107760
复制
发表时间：
2020-03-15
影响因子：
13.1
通讯作者：
Modler, Niels
中科院分区：
文献类型：
--
作者：
Kardos, Marton;Koerner, Enrico;Modler, Niels
使用片状模塑化合物成型的部件的气孔缺陷是一个公认的问题。它是外部应用中油漆缺陷的主要来源，阻碍了这些材料的广泛使用，尽管它们比金属和热塑性塑料具有固有的优势。研究了纤维体积分数和纤维长度对a类化合物孔隙含量和涂层表面质量的影响。对不同玻璃纤维含量和纤维长度的复合材料进行复合、压缩成型和涂覆，分析上述因素对纤维网络的渗透性、初始到最终孔隙含量的演变以及对涂覆表面质量（波纹度和基材相关的涂料缺陷）的影响。引入了一个新的指标——孔隙传输效率因子，以帮助量化相关表征特征。结果表明，纤维含量越低，孔隙含量越少，可涂性越好。
The porosity defects from components molded using sheet molding compounds is a well-recognized issue. It is the major source of paint defects in exterior applications, hindering the widespread use of these materials despite their inherent advantages over metals and thermoplastics. This study discusses the influence of fiber volume fraction and fiber length on the pore content and on the painted surface quality of class-A compounds. Compounds with varying glass fiber fraction and fiber length were compounded, compression molded and painted to analyze the influence of the aforementioned factors on the permeability of the fibrous network, the evolution of initial to final pore content and on the painted surface quality with regards to waviness and substrate-relevant paint defects. A new indicator, the pore transport efficiency factor is introduced to help quantify the related characterization feature. The results indicate that lower fiber fractions lead to decreased pore contents and thus, improved paintability.