考虑剪切变形的蜂窝夹层木质复合梁弯曲特性研究  

Bending performance of sandwich beam with wooden top and paper of honey-comb core

作　　者：郝景新[1,2] 吴新凤 刘文金[1,2] 

机构地区：[1]中南林业科技大学,长沙410004 [2]湖南省家具家饰工业设计中心,长沙410004

出　　处：《木材加工机械》2013年第4期29-33,24,共6页Wood Processing Machinery

基　　金：湖南省教育厅优秀青年项目:蜂窝夹层木质复合梁弯曲特性研究;湖南省研究生创新基金:家具用环保型竹碎料夹层复合板的力学性能研究(CX2012B315);国家林业公益性行业科研专项:梓木增重改良与实木家具关键制造技术研究(201204712)

摘　　要：为了分析夹层梁的弯曲特性,建立了基于Reissner理论的横向位移表达式,并进行实验验证,结果表明:小弹性变形范围内,考虑剪切变形的理论模型能够比较精确地模拟实际承载实验中的变形与位移,但对芯层较小的夹层梁预测精度较低。芯层厚度对夹层梁的横向位移影响显著,随着芯层厚度的增加,蜂窝夹层梁的横向剪切变形、纯弯曲变形逐渐减小,但减小的幅度值随着芯层厚度的增加而减少,剪切变形占总横向位移的比重越来越大,在同样的受力条件下,"∥"试件的剪切变形大于"⊥"试件。In order to analyze the bending performance of sandwich beam, a simple transverse displacement model based on Reissner theory was set up. After comparison with test results, it is shown that the method considering shear deformation is a good tool to forecast the deformation of sandwich beam with relative high accuracy while it is not suitable to the ones with thin honey-comb core. In addition, the thickness of core has significant effect on the transverse displacement, and the shear and bending deformation is decreased gradually with increasing core thickness but the declining speeding become smaller, furthermore the ratio of shearing deformation to the total is increased accordingly, and the samples of ＂//＂ direction has smaller shearing deformation than the ones of ＂⊥＂ direction under the same condition and loading level.

关 键 词：夹层梁 蜂窝芯 木质材料 弯曲特性 剪切变形 

分 类 号：TS653.8[轻工技术与工程]