Hu Yu'an, He Mei, Semple Kate, Chen Meiling, Pineda Hugo, Zhou Chenli, Dai Chunping
Jiangxi Academy of Forestry, Nanchang 330029, China.
Department of Wood Science, Faculty of Forestry, University of British Columbia, 2900-2424 Main Mall, Vancouver, BC V6T 1Z4, Canada.
Materials (Basel). 2021 Mar 4;14(5):1198. doi: 10.3390/ma14051198.
Bamboo fiber composite (BFC) is a unidirectional and continuous bamboo fiber composite manufactured by consolidation and gluing of flattened, partially separated bamboo culm strips into thick and dense panels. The composite mechanical properties are primarily influenced by panel density, its variation and uniformity. This paper characterized the horizontal density distribution (HDD) within BFC panels and its controlling factors. It revealed that HDD follows a normal distribution, with its standard deviation (SD) strongly affected by sampling specimen size, panel thickness and panel locations. SD was lowest in the thickest (40 mm) panel and largest-size (150 × 150-mm) specimens. There was also a systematic variation along the length of the BFC due to the tapering effect of bamboo culm thickness. Density was higher along panel edges due to restraint from the mold edges during hot pressing. The manual BFC mat forming process is presented and found to effectively minimize the density variation compared to machine-formed wood composites. This study provides a basic understanding of and a quality control guide to the formation uniformity of BFC products.
竹纤维复合材料（BFC）是一种单向连续的竹纤维复合材料，它通过将扁平的、部分分离的竹秆条带进行固结和胶合，制成厚实紧密的板材。复合材料的力学性能主要受板材密度、密度变化及均匀性的影响。本文对BFC板材内部的水平密度分布（HDD）及其控制因素进行了表征。结果表明，HDD呈正态分布，其标准差（SD）受取样试件尺寸、板材厚度和板材位置的强烈影响。在最厚（40毫米）的板材和最大尺寸（150×150毫米）的试件中，SD最低。由于竹秆厚度的逐渐变细效应，沿BFC长度方向也存在系统变化。由于热压过程中模具边缘的约束，板材边缘的密度较高。介绍了手工BFC毡成型工艺，发现与机器成型的木质复合材料相比，该工艺能有效减少密度变化。本研究为BFC产品成型均匀性提供了基本认识和质量控制指南。
