高径比跨高比对荆条纵向抗压抗弯性能测试精度的影响  

The Influence of Height to Diameter and Span to Diameter Ratios on the Test Precision of Compressive and Bending Properties of Vitex negundo Twigs

作　　者：高璟[1] 张晓燕[1] 卢国新[1] 程悦 安胜足[1] 

机构地区：[1]河北农业大学河北省林木种质资源与森林保护重点实验室,河北保定071000

出　　处：《西北林学院学报》2014年第4期214-218,共5页Journal of Northwest Forestry University

基　　金：国家科技部"十一五"科技支撑计划项目:"华北土石山区植被恢复与重建技术试验示范"(2006BAD03A11);河北省林业局项目(0803015);河北农业大学重点科研基金项目"荆条材性分析及荆编家具制造工艺研究"

摘　　要：为研究荆条的纵向抗压抗弯性能的测试方法,测试了不同高径比跨高比荆条试样的纵向抗压强度及抗弯强度、最大弯曲挠度、弹性模量等力学指标。结果表明,1)高径比1.5时的纵向抗压强度测试精度最佳;并随荆条直径增加,其纵向抗压强度减小。2)跨高比为8、10和12时测得的抗弯强度均能满足试验精度要求,并随跨高比的增加,变异系数、准确指数有递增趋势,且随荆条直径增大,其抗弯强度减小,最大弯曲挠度增大。3)弹性模量随着跨高比的增大而增大,随着直径的增大而减小。In order to research the test methods on axial compressive and bending properties of Vitex negun- do twigs, mechanical properties, such as axial compressive and bending strength, maximum bending de- flection and modulus of elasticity were tested. The results indicated best height to diameter ratio was 1.5. The compressive strength decreased with the increase of diameter. The bending strength values could meet the test accuracy when span to diameter ratios were 8, 10, and 12. Increasing trends were observed on of variation coefficient and accuracy index with span to diameter ratio. The bending strength decreased and the maximum bending deflection increased with the increase of diameter. The modulus of elasticity in- creased with span to diameter ratio, but decreased with the increase of diameter.

关 键 词：荆条 高径比 跨高比 抗压强度 抗弯强度 

分 类 号：S793.7[农业科学—林木遗传育种]