木质基直柱型点阵夹芯结构的平压和弯曲性能研究

利用一种简单的插入-胶合方法,以杨木单板层积材和桦木圆棒榫制备了一种新型的木质基柱型点阵夹芯结构;采用正态测试方法和无损检测方法分别对圆棒榫和面板进行优选以降低木材变异性对试验结果的影响;对由2种不同圆棒榫尺寸制备的夹芯结构的平压和弯曲性能进行了研究.结果表明,运用理论模型来预测该种夹芯结构的平压强度和平压弹性模量试验结果表明,理论预测值大于实测值;平压试验的主要失效模式是圆棒榫的剪切破坏,与此同时该种夹芯结构在平压试验中表现出较好的能量吸收能力,而这一性能对其在木结构中应用的安全性极为重要;该种夹芯结构的弯曲性能与相对密度存在一定的线性关系.

Compressive and Bending Behaviours of Wood-based Two-dimensional Lattice Truss Core Sandwich Structures

In order to reduce the influence of wood＇ s variability,normality test and non-destructive test were used to optimal select dowels and facesheets,respectively.The out-of-plane compressive and bending behaviours of sandwich structures made of two different dowels size were investigated.Analytical models were employed in this study to predict the compressive collapse strength and Young＇s modulus of the sandwich structures.The theoretical predictions are larger than the experimental results.The failure modes of the sandwich structures are represented by the shear failure of the dowels under out-of-plane compressive loads; meanwhile,The out-of-plane compressive behaviours of the sandwich structures demonstrate a good energy absorption capability which is an important factor for the safety of wooden construction.The bending behaviours of the sandwich structures indicate that its mechanical properties and relative density has an certain linear relationship.