木质格栅夹芯胞元结构的平压力学性能  

Compression mechanical properties of woody grid sandwich unit cell structure

作　　者：杨冬霞[1,2] 胡英成 范长胜[2] YANG Dongxia;HU Yingcheng;FAN Changsheng(Harbin University,Key Laboratory of Heilongjiang Underground Engineering Technology,Harbin 150086,China;Key Laboratory of Bio-based Material Science and Technology,Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]哈尔滨学院,黑龙江省地下工程技术重点实验室,哈尔滨150086 [2]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《林业工程学报》2018年第5期34-40,共7页Journal of Forestry Engineering

基　　金：哈尔滨学院博士基金(HUDF2014);中国博士后基金(2017M611339);黑龙江省教育科学规划课题(GBB1317063);国家自然科学基金(31470581)。

摘　　要：由低密度和增强复合材料制成的超轻夹层结构具有优异的比强度、比刚度和较大的互连空间,基于这种结构特点,可以将其应用于木质工程材料结构的优化中。为得到一种轻质高强、设计空间大的木质夹芯结构以适应现代木结构建筑的需求,研究了木质金字塔型格栅夹芯结构胞元的平压力学性能,建立了金字塔型格栅夹芯结构的力学模型,计算分析了平压状态下的载荷与芯子形变位移间的关系。设计并制作了面板厚度相同、芯子直径不同的3种胞元结构,利用ANSYS有限元软件仿真并测试了3种胞元结构的平压力学性能。研究结果表明:在满足小于组成材料极限应力条件下,胞元承载能力由面板与芯子共同决定。芯子是受力主体,芯子的直径与胞元的承载力成正比,与胞元的比强度成反比,芯子直径越大,胞元的平压能力越强,但性能并非最优;平压状态下3种胞元结构的比强度均高于其组成材料的比强度,属于高比强度的自然生物质材料构型。The ultra-light sandwich structures made of low density and reinforced composites have excellent specific strength,specific stiffness and large interconnecting space.This structure can be applied to the optimization of the structure of wood engineering materials.In order to develop a kind of woody sandwich structure with light weight,high strength and large design space to meet the architectural needs of modern woody structure,the compression mechanical properties of the structural unit cell of the woody pyramid grid sandwich structure were investigated.The mechanical model of the pyramid type grid sandwich structure was established,and the relationships between the load and the deformation displacement of the cores in the compression state were analyzed.Three-unit cell structures with the same thickness,but different core diameters were designed and fabricated.The stress and deformation of the unit cell under the material stress state and the compression mechanical properties of three-unit cell structures were simulated by ANSYS finite element software.The results showed that,under the limit stress state of the constituent material,the bearing capacity of the cell was determined by the joint of the panel and the cores.The cores were the subject of force,and the diameters of the cores were directly proportional to the carrying capacity of the unit cells,which was inversely proportional to the specific strength of the unit cell.The larger the core diameter was,the stronger the cell s flat pressure was,while the best performance was not achieved.Under the condition of flat pressure,the specific strength of three-unit cell types were higher than that of the specific strength of the composition material,and the three-unit cell types belonged to the natural biomass material structure with high specific strength.The results of this research can provide the theoretical and experimental foundation for the research of the mechanical properties of the woody grid structure.

关 键 词：木质格栅结构 夹芯结构 胞元 平压力学性能 

分 类 号：S781.2[农业科学—木材科学与技术]