【摘要】 以表层为竹材、芯层为杉木拼板、背层为杨木单板的竹木复合地板为对象,利用ANSYS有限元软件,采用湿热类比法模拟表层和芯层厚度不同的竹木复合地板在干燥环境中的含水率变化,然后进行热结构耦合分析,研究由含水率变化引起的竹木复合地板的翘曲变形.结果表明:胶层能够起到水分屏障的作用,胶层内部木材的含水率变化很小,在使用中受空气湿度变化影响的主要是表层的竹材部分,而且表层竹材越薄的竹木复合地板其含水率越早与环境达到平衡;芯层厚度对竹木复合地板翘曲变形率有较大影响,而表层厚度对其翘曲变形率影响较小.该研究可为竹木复合地板的制造设计提供依据.更多还原

【Abstract】 Change of moisture content in the ambient air results in non-uniform cross-section moisture profiles and generates warping deformation because of asymmetry of hygro-expansion.In order to support the design of bamboo-wood composite flooring,the moisture content(MC) changes and the deformation ratio of bamboo-wood composite flooring was investigated in dry conditions using thermal-structure coupled analysis with ANSYS software.Wood and bamboo are assumed to be orthotropic materials,and adhesive layer is assumed to be homogeneous material in this model.The influence of the core layer thickness and surface layer thickness of the bamboo-wood composite flooring is taken into consideration in the model. The simulation results show that the adhesive layer between the surface and the core layer acts as a water vapor barrier because lower moisture diffusion coefficient,so the MC of the surface layer changes with the environment condition.However,the MC of the core and backing layer remains stable.The thickness of the surface has an impact on the time needed for the floor to reach the equilibrium MC and the maximum cupping deformation.Thickness of the core layer rather than the surface has great effect on the cupping deformation ratio of bamboo-wood composite flooring.更多还原