环境温湿度对竹材增强LVL力学性能的影响

在不同温湿度条件下,对竹材增强单板层积材(LVL)进行处理,分析了经过处理后竹材增强LVL力学性能的变化。结果表明:经过高温高湿处理后,竹材增强LVL的力学性能均出现了明显的衰减。其中,弹性模量(MOE)平均衰减30.7%,静曲强度(MOR)平均衰减38.3%,冲击韧性平均衰减11.7%;经过低温处理后,竹材增强LVL的弹性模量和静曲强度都有微弱增长的趋势,弹性模量平均增长率为2.5%,静曲强度平均增长率为5.4%,冲击韧性平均衰减率为37.9%;在高低温交变处理过程中,竹材增强LVL的弹性模量和静曲强度处于上下波动的状态,弹性模量衰减率或增长率在5%以内,静曲强度衰减率或增长率在10%以内,冲击韧性呈衰减趋势,平均衰减率为18.7%。

Effects of Temperature and Humidity of Environment on Mechanical Properties of Bamboo-wood Composites LVL

Bamboo-wood composites laminated veneer lumber(LVL) was treated under different temperature and humidity conditions.The mechanical properties of bamboo-wood composites LVL after the treatment were discussed.The results showed:(1)After the treatment of high temperature and humidity,all the mechanical properties of the LVL decreased obviously,in which,MOE decreased 30.7% in average,MOR decreased 38.3% in average,toughness decreased 11.7% in average.(2)After the treatment of low temperature,the MOE and MOR of bamboo-wood composites LVL revealed the trends of slight increase,the average increase rate of MOE was 2.5%,the average increase rate of MOR was 5.4%,the average decrease rate of toughness was 37.9%.(3)During the treatment of fluctuation from high temperature to low temperature,the MOE and MOR of bamboo-wood composites LVL were in the state of fluctuation,the increase rate or decrease rate of MOE was less than 5%,the increase rate or decrease rate of MOR was less than 10%,toughness displayed the trend of decrease,the decrease rate was 18.7% in average.