厚胶合板弹性模量预测模型

Prediction of modules of elastic of thick plywood

为了预测厚胶合板弹性模量,通过简化层合板理论,该文建立了胶合板弹性模量预测模型,并以单板条、经过涂胶热压处理的单板条和相同工艺条件下的单板层积材的弹性模量,采用4种不同铺层方式的19层桉树胶合板对模型进行了验证。结果表明:3种预测值与实测值的趋势一致,相关系数R2顺纹在0.86以上,横纹在0.88以上,但是精度不同。采用单板条弹性模量预测的胶合板弹性模量比实测值偏低;采用经过涂胶热压处理后的单板条弹性模量预测的胶合板弹性模量比实测值偏高;采用相同工艺条件下的单板层积材弹性模量预测的胶合板弹性模量与实测值偏差较小,顺纹平均误差为4.64%,横纹平均误差10.94%。因此,采用相同工艺条件下的单板层积材的弹性模量来预测胶合板的弹性模量是可行的。

In order to predict the modules of elastic （MOE） of thick plywood, a mathematical model was developed by predigested laminate theory. The MOE of plywood was predicted based on MOE of veneer stands, veneer stands treated with gluing and hot-pressing or laminate veneer lumber. The results showed that the trend of predicted values by three methods was similar to experimental values of MOE. The correlation coefficients between predicted and experimental values of longitudinal and transverse MOE were above 0.86 and 0.88, respectively. Different methods had obvious different accuracy. The experimental MOE of plywood was higher than that predicted by the MOE of veneer stands, while lower than that predicted by the MOE of veneer stands treated with gluing and hot-pressing. The MOE of plywood predicted by the MOE of laminate veneer lumber well agreed with the experimental values, the average error values of longitudinal and transverse MOE were 4.64% and 10.94%, respectively. The results indicate that the MOE of thick plywood predicted by the MOE of laminate veneer lumber at the similar hot-pressing technology is accurate and practicable.