单板接缝对LVL力学性能的影响  

Effect of scarf joints of veneer on mechanical properties of LVL

作　　者：许斌[1] 詹先旭 沈文益 程涵 

机构地区：[1]南京林业大学竹材工程研究中心,南京210037 [2]德华集团控股股份有限公司 [3]连云港永益木业有限公司 [4]山东立晨木业集团有限公司

出　　处：《林业科技开发》2015年第1期55-58,共4页China Forestry Science and Technology

基　　金：苏北科技发展计划-科技型企业技术创新项目"新型复合LVL的关键技术研发与应用"(BC2013426);国家林业公益性行业科研专项(201304503-02);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：将LVL中的单板接缝分别配置在表芯层、同一垂直面上、错开的相邻层,并对所测得的力学性能进行分析,结果表明:除最外3层同位接缝外,其他接缝板材的3点弯曲和4点弯曲静曲强度和弹性模量都大于无接缝板A。同位接缝的水平剪切强度按接缝11,5,6,7和9层递增。表背3层接缝错开对板材的静曲强度提高幅度高于芯层5层接缝错开的影响;弹性模量在表背3层随着接缝错开距离的增加而升高,随着芯层5层接缝错开距离的增加而减小。Veneers of laminated veneer lumber （LVL） were joined by scarf joints.The positions of the joints were either the same in adjacent layers or not.Mechanical properties of the lumber were investigated.It was found that joined veneers improved the modulus of elasticity （MOE） and modulus of rupture （MOR） of the lumber except for samples with the same position joints in the outer 3 layers.For samples with the same position joints,the 9-layer joint arrangement exhibited the highest horizontal shear strength,followed by 7-layer,6-layer,5-layer and 1 1-layer arrangement.For samples where the joint positions were not the same,the MOR of the samples with joints in the 3 outer layers was higher than those with joints in the 5 core layers.In the 3 outer layers,the MOE increased with the increasing of the adjacent joints distance.However,in the 5 core layers,it decreased with the increasing of adjacent joints distance.

关 键 词：单板层积材 单板斜接 同位接缝 力学性能 接缝分布 

分 类 号：TS653[轻工技术与工程]