高频热压杨木单板层积材纵向弹性模量和泊松比的测定与分析

Measurement and Analysis of Longitudinal Elastic Modulus and Poisson’s Ratio of High Frequency Hot Pressing Poplar Laminated Veneer Lumber

基于四点弯曲法,对一种基于高频热压技术的厚型杨木单板层积材的纵向弹性模量和纵横向泊松比进行了试验测定。其中纵向弹性模量的测定,分别采用了挠度法和应变片法。实验结果表明,2种测量方法所得纵向弹性模量数值比较接近,但又存在一定的差异,并对其差异的影响因素进行了探讨。基于高频热压技术的杨木单板层积材纵向弹性模量的测定结果表明,其纵向弹性模量接近甚至超过杨木单板,为该材料引入重型产品包装箱领域甚至结构用材料,从而替代原木,提供了一定的参考价值。

The longitudinal elastic modulus and length-breadth Poisson＇s ratio of a thick high frequency hot pressing poplar laminated veneer lumber was determined using four-point bending method. Flexibility method and strain gauge method was used to determine the longitudinal modulus of elasticity. The experimental results showed that the values of longitudinal elastic modulus in the two measurements are relatively close, but there are also some differences. The influencing factors on the differences were discussed. The test results of high frequency hot pressing poplar LVL longitudinal elastic modulus showed that the longitudinal elastic modulus is close to or above the poplar veneer, which can be reference for substitution of the material for raw wood in heavy product box or even structural materials.