http://orcid.org/0000-0002-9596-072X
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ABSTRACT
Driven by the need for sustainable eco-friendly materials, natural fibers are increasingly being used as composites reinforcements due to their low cost and their potential in meeting strength and stiffness requirements for nonstructural and semistructural applications. Fewer works, however, have been reported on the acoustic and vibration characteristics of natural fibers. In this article, the sound transmission and absorption performance of flax fiber-reinforced polypropylene (PP) composites in various configurations are assessed experimentally. Natural frequency and damping coefficient of the composites are investigated by modal analysis with an impact hammer. Results from the vibrational analysis showed that thin FF/PP composite panels have resonant frequency ranging between 300 and 1000 Hz which is consistent with the acoustic profile extracted from the sound transmission loss (STL) test. Results of STL tests revealed that higher stiffness of FF/PP composite may lead to higher STL at 100–400 Hz. Resonant frequencies of the composite range from 400 to 900 Hz and STL is show to obey the mass law with nonlinearity in the range of 900–1600 Hz. These results give a better insight into the performance of FF/PP composites in vibroacoustic environments.
摘要
由于对可持续环保材料的需求，天然纤维越来越多地被用作复合材料增强材料，因为它们的成本低，并且能够满足非结构和半结构化应用的强度和刚度要求。然而，关于天然纤维的声学和振动特性的报道较少。本文对亚麻纤维增强聚丙烯复合材料在不同结构下的吸声性能进行了实验评价。用冲击锤进行模态分析，研究了复合材料的固有频率和阻尼系数。振动分析结果表明，细麻/聚丙烯复合板的共振频率在300～1000赫兹之间，与声透射损失（STL）测试所得的声学剖面一致。STL测试的结果表明，亚麻/聚丙烯复合材料的高刚度可能会导致更高的声音传输损耗在100至400赫兹。在900～1600赫兹范围内，复合材料的谐振频率从400到900赫兹，STL显示出服从非线性的质量定律。这些结果对亚麻复合材料在振动声环境下的性能有了更好的认识。