金明敏 胡英成

摘要 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，與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。

关键词 点阵夹芯结构;无损检测;理论预测;木质复合材料;剪切失效

中图分类号 S785 文献标识码 A 文章编号 0517-6611（2014）33-11760-06

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

JIN Ming-min， HU Ying-cheng*

（Key Laboratory of Bio-based Material Science and Technology of Ministry of Education of China， College of Material Science and Engineering， Northeast Forestry University， Harbin， Heilongjiang 150040）

Abstract In order to reduce the influence of woods 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 Youngs 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.

Key words Lattice truss core sandwich structure; Non-destructive test; Theoretical prediction; Wood composites; Shear failure

基金项目 国家自然科学基金项目（31170516，31470581）;中央高校基本科研业务费专项（DL12EB03）。

作者简介 金明敏（1989- ），男，浙江杭州人，硕士研究生，研究方向：生物质材料性能和结构设计。

*通讯作者，教授，博士，博士生导师，从事生物质材料性能研究。

收稿日期 2014-09-30

近年来，由于突出的比强度和比刚度以及较大的相互连通空间，点阵结构被作为最有前景的新一代材料。最初，点阵结构是由高强度的铝合金如钛[1]和铝[2]来设计和制备的。Wicks等基于指定的弯曲和横向剪切载荷来优化设计该种点阵夹芯结构[3]。除此之外，该种点阵夹芯结构的动静态力学响应被多名学者所研究[4-7]。……