薄型刨花板的动静态弹性模量检测

传统的薄型刨花板弹性模量测定方法都是对试件进行3点或4点静态弯曲变形试验,测定过程复杂,消耗时间长,并且对试件造成破坏.利用自行研制开发的基于悬臂自由振动和悬臂弯曲原理的薄板类木质材料力学快速测量仪,对3种规格的薄型刨花板的动态弹性模量和静态弯曲弹性模量进行检测,并对测量结果进行相关性分析,同时利用3点弯曲法测量了相同试件的3点弯曲弹性模量加以对比验证.结果表明:悬臂振动动态弹性模量均值大于悬臂弯曲静态弹性模量,且两者之间总体相关系数达到0.98,在0.01水平上呈显著相关；悬臂振动动态弹性模量与3点弯曲弹性模量间的总体相关系数达到0.75,在0.01水平土呈显著相关,说明可以利用薄板类木质材料力学快速测量仪快速测量薄型刨花板的弹性模量.

Dynamic and static modulus measurements for thin particleboard

To provide a means of dynamic and static bending evaluation for modulus of elasticity with small samples of thin wood composites,a cantilever-beam testing apparatus was developed based on the principle of cantilever-beam bending and vibration.Three sizes of thin particleboard,thickness of 3 mm,5 mm and 8 mm,were tested and compared using a correlation analysis by Statistical Package for the Social Science（SPSS） software and the three-point bending method.Testing results showed a highly significant correlation（P0.01） for dynamic modulus（Ed） and static bending modulus（Es） with three sizes of thin particleboard.Re-sults also showed a highly significant correlation（P0.01） between Ed and the three-point bending modulus（Eb） for three sizes of thin particleboards.So for thin particleboards,Ed and Es as well as Ed and Eb were strongly related,and it would be effective to measure the cantilever dynamic modulus and the static bending modulus with this cantilever-beam testing apparatus.