湿效应对竹木复合材料刚度性能的影响  

Hygro-effect on stiffness properties for a wood-bamboo composite laminate

作　　者：王泉中[1] 张晓冬[2] 周雪华[1] 

机构地区：[1]南京林业大学机械电子工程学院,江苏南京210037 [2]南京林业大学竹材工程研究中心,江苏南京210037

出　　处：《浙江林学院学报》2010年第4期591-594,共4页Journal of Zhejiang Forestry College

基　　金：国家高新技术发展计划(863计划)资助项目(2002AA245171)

摘　　要：首先根据经典层合板理论和一阶剪切变形理论的基本假设,建立起相关的位移模式,进一步推导出考虑湿效应下竹木复合层合梁的势能函数表达式,然后运用材料力学的等效梁理论推导出考虑湿效应下的竹木复合层合梁的等效弹性模量。比较了不同理论下湿效应前后的等效弹性模量与弯曲变形。研究表明,吸湿比例达30%时,竹木复合材料的等效弹性模量损失逾一半,而同样载荷下弯曲变形则是原有的2倍。To determine the potential energy function derived from a wood-bamboo composite laminate employing the hygro-effect, a displacement model was established based on assumptions of the classical laminated plate theory （CLPT） and the first-order shear deformation theory （FSDT）. Then, the equivalent elastic modulus of wood-bamboo composite laminate with the hygro-effect was derived according to the equal beam theory. Using several theories, a comparison of the equivalent elastic modulus and bending deformation was made before and after the hygro-effect was used. Results showed when moisture concentration increased up to 30%, the equivalent elastic modulus of bamboo and wood composite materials decreased more than half, and under the same load, bending deformation was twice that of the original.

关 键 词：林业工程 竹木复合层合板 湿效应 经典理论 一阶剪切变形理论 

分 类 号：S781[农业科学—木材科学与技术]