家具用马尾松单板层积材力学性能的研究

马尾松是我国分布广泛的针叶树种，且木纹漂亮，但富含油脂，影响木材胶合。根据前人研究成果，用酚醛树脂胶粘剂制造未脱脂马尾松单板层积材可以实现完美胶合。采用随机激励功率谱法测试单板层积材的动态弹性模量，并采用3点静态弯曲试验代替4点弯曲试验测试制得板材的静态弹性模量、静曲强度和水平剪切强度以检验材料性能。结果表明:马尾松单板层积材平均弹性模量6 231 MPa，静曲强度45.5 MPa，满足家具用材要求；马尾松单板层积材垂直加载和平行加载条件下的弹性模量相同；动态弹性模量和静态弹性模量基本吻合；马尾松单板层积材平行加载下的水平剪切强度大于垂直加载条件下的水平剪切强度。

Mechanical Performances of Laminated Veneer Lumber from Pinus massoniana for Furniture Manufacturing

Pinus massoniana is widespread in China and has good-looking grain which leads to the potentiality in furniture manufacturing. However, the rich resin in the timber has influenced the perfect bonding. Based on the previous work, this work made an attempt to manufacture laminated veneer lumber (LVL) which was bonded with phenol-formaldehyde (PF) and test the mechanic performance of LVL product by three-points bending. The results showed that the average modulus of elasticity (MOE) was 6 231 MPa and the average modulus of rupture (MOR) was 45.5 MPa, which could meet the requirements of furniture making. MOE of LVL under flat-wise bending was similar to that of LVL under edge-wise bending. Dynamic MOE of LVL agreed well with static MOE and the horizontal shear strength of LVL under edge-wise bending was greater than that of LVL under flat-wise bending.