Cherradi Youssef, Cerbu Camelia, Rosca Ioan Calin, Seman Adnane, El Qarnia Hamid, Dimokrati Ahmed, Benyoucef Mustafa
LAMIGEP Laboratory, Moroccan School of Engineering Sciences, Marrakech 40000, Morocco.
Department of Mechanical Engineering, Faculty of Mechanical Engineering, Transilvania University of Brasov, B-dul Eroilor 29, 500036 Brasov, Romania.
Polymers (Basel). 2025 Jan 8;17(2):142. doi: 10.3390/polym17020142.
Considering the growing need for developing ecological materials, this study investigates the acoustic, mechanical, and thermal properties of wood composites reinforced with beech or oak wood fibres. Scanning electron microscopy (SEM) revealed a complex network of interconnected pores within the composite materials, with varying pore sizes contributing to the material's overall properties. Acoustic characterization was conducted using a two-microphone impedance tube. The results revealed that the fibre size significantly impacts the sound absorption coefficient, demonstrating that the highest sound absorption coefficient of 0.96 corresponds to the composites reinforced with oak wood fibres with a size of 2 mm in the low-frequency range of 1000-2500 Hz. Mechanical testing revealed a significant reduction in compressive strength as fibre size increased from 0.4 mm to 2 mm, correlating with the observed changes in sound absorption and thermal properties. Thermal analysis indicated thermal conductivity (λ) values ranging from 0.14 to 0.2 W/m·K, with a notable increase in conductivity as fibre size decreased. It was shown that composites reinforced with beech or oak wood fibres with a size of 2 mm are recommendable for insulation materials due to the lowest thermal conductivity of 0.14 W/(m·K). Oak wood composites with a fibre size of 0.4 mm recorded the highest heat capacity, which is 54.4% higher than the one corresponding to the composites reinforced with the largest fibres. The results regarding heat diffusion rates are also reported. The findings about the effects of fibre size and pores on thermal, acoustic and mechanical properties provide valuable insights for designing sustainable materials, offering potential applications in industries where balanced performance across multiple properties is required.
考虑到开发生态材料的需求不断增长，本研究调查了用山毛榉或橡木纤维增强的木质复合材料的声学、力学和热性能。扫描电子显微镜（SEM）显示复合材料内部存在相互连接的复杂孔隙网络，不同的孔径对材料的整体性能有贡献。使用双传声器阻抗管进行声学表征。结果表明，纤维尺寸对吸声系数有显著影响，表明在1000 - 2500 Hz的低频范围内，吸声系数最高可达0.96，对应于用2 mm尺寸的橡木纤维增强的复合材料。力学测试表明，随着纤维尺寸从0.4 mm增加到2 mm，抗压强度显著降低，这与观察到的吸声和热性能变化相关。热分析表明热导率（λ）值在0.14至0.2 W/m·K之间，随着纤维尺寸减小，热导率显著增加。结果表明，由于热导率最低为0.14 W/(m·K)，用2 mm尺寸的山毛榉或橡木纤维增强的复合材料适用于隔热材料。纤维尺寸为0.4 mm的橡木复合材料记录到最高的热容量，比用最大尺寸纤维增强的复合材料的热容量高54.4%。还报告了关于热扩散率的结果。关于纤维尺寸和孔隙对热、声和力学性能影响的研究结果为设计可持续材料提供了有价值的见解，在需要多种性能平衡的行业中具有潜在应用。
