竹材模型的建立-国际竹藤中心.doc

竹材径向压缩的蠕变行为张晓敏 1,2孙正军 1王喜明 2 (1国际竹藤网络中心,北京 100102 ;2内蒙古农业大学材料与艺术设计院,呼和浩特 010019 ) 摘要:用四元件的 Burger 粘弹性模型拟合了毛竹竹材在压力为 6MPa 时不同温度、含水率下径向压缩的蠕变行为,确定了模型中的 4个元件参数。结果表明:在压应力小于屈服极限时, Burger 模型可用来描述竹材径向压缩的短期蠕变行为;4个元件模型参数受温度和含水率影响较大,实验结果表明:四元件参数与含水率成反比关系,温度与瞬时弹性模量 Ee成正比关系,与其他三元件参数成反比关系。关键词: 竹片单元径向压缩勃格模型元件参数 Creep Behavior ofB amboo C ompress ed on Radical Direction ZHANG XIAO MIN 1,2, SUN ZHENG JUN 1, WANG XI MING 2 (1. International Center for Bamboo and Rattan, Beijing 100102,China; 2 Inner Mongolia Agricultural University ,Huhhot 010019, Inner Mongolia ,China) Abstract : Burger model was used to imitate the pression creep behavior of bamboo (Phyllostachs edulis) under the different temperature , the moisture content . The four element parameters of Burger model were determined in this paper . The results showed that the creep behavior of bamboo was obtained by means of the Burger model in the yield strength scope . The experimental results show that: the ponent parameters is inversely proportional to moisture content, temperature and the instantaneous elastic modulus Ee in direct proportion al relationship While the other ponents is inversely p roportional to the temperature. Key words : Bamboo, pression , Burger model , Element parameter 木材是可压缩的多孔固体材料, 在径向和弦向具有类似高分子材料的粘弹行为, 但本质是多孔材料的压缩。其粘弹行为受到温度、湿度、加载时间、加载速率和应变幅值等条件的影响。蠕变和应力松弛为粘弹性的两种典型加载模式。我国对木材流变学的研究始于 20 世纪 80 年代中期, 王培元研究了刨片的横纹压缩流变性能