摘要
用普通桉木单板研究开发高强结构用木质复合材料,解决当前桉木因材性较差难以适应结构用材的需求及普通单板层积材弹性模量与静曲强度指标大多维持在120E~140E的较低水平等问题,开拓新型结构用单板层积材的应用市场。运用复合材料层合板理论、界面结合理论研制聚丙烯腈(PAN)基碳纤维增强结构用单板层积材(SLVL),采用正交试验方法探究产品结构与工艺因素对复合板材各项理化性能的影响,以及分析碳纤维铺设率对力学性能的影响规律。结果表明:PAN基碳纤维增强复合材料效果显著,各理化性能均呈提高的趋势但增幅不一。热压压力对板材浸渍剥离性能和水平剪切强度影响显著,纳米SiO_(2)添加与碳纤维层数及铺设结构对性能有较大影响。各工艺因素对弹性模量和静曲强度的影响趋势及较优水平基本一致,但方差分析显示试验范围各因素变化产生的影响不显著。优化工艺参数为碳纤维层数2层、纳米SiO_(2)2.5%、热压时间1.25 min/mm、热压压力2.0 MPa。为提高材料利用效率并降低成本,碳纤维铺设率的提高有利于SLVL力学性能的提升,铺设率从30%增大到50%时,各项性能的提高幅度较大,继续增至70%时提高幅度有所下降,趋势表明选择适当的铺设率可以达到合理利用与成本控制的目的。
The research and development of wood composite materials for high-strength structures with ordinary eucalyptus veneers solve the problem that the eucalyptus wood is difficult to adapt to the needs of structural materials due to its poor wood properties.The elastic modulus and static bending strength indexes of ordinary laminated veneer lumber materials are mostly maintained at the level of 120E-140E,and the application market of the new structural laminated veneer lumber has developed rapidly.Polyacrylonitrile(PAN)-based carbon fiber reinforced structural laminated veneer lumber(SLVL)was fabricated based on the principle of composite materials.The effects of product structure and process factors on the physical and chemical properties of composite boards were investigated by the orthogonal test method,and the influence of carbon fiber laying rate on mechanical properties was analyzed.The results showed that the effect of PAN-based carbon fiber reinforced composites was remarkable,and the physical and chemical properties were improved but the increases were different.The hot-pressing pressure had a significant effect on the impregnation stripping performance and horizontal shear strength of the sheet.The addition of nano-SiO_(2),the number of carbon fiber layers and the laying structure had a great influence on the performance.The influence trend and optimum level of each process factor on the elastic modulus and static bending strength were basically the same,but the variance analysis showed that the influence of each factor change in the test range was not significant.The optimized process parameters were as follows:carbon fiber layer 2,nano-SiO_(2) of 2.5%,hot-pressing time of 1.25 min/mm,hot-pressing pressure of 2.0 MPa.In order to improve the material utilization efficiency and reduce the cost,the increase of carbon fiber laying rate was beneficial to the improvement of mechanical properties of SLVL.When the laying rate increased from 30%to 50%,the improvement of various properties was larger,and the increase
作者
徐煜炜
侯伦灯
XU Yuwei;HOU Lundeng(National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials,College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,China)
出处
《林业工程学报》
CSCD
北大核心
2023年第4期59-65,共7页
Journal of Forestry Engineering
基金
福建省科技计划星火项目(2019S0048,2018S0038)。
