| 高径比跨高比对荆条纵向抗压抗弯性能测试精度的影响 |
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| 引用本文： | 高璟,张晓燕,卢国新,程悦,安胜足.高径比跨高比对荆条纵向抗压抗弯性能测试精度的影响[J].西北林学院学报,2014,29(4):214-218. |
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| 作者姓名： | 高璟 张晓燕 卢国新 程悦 安胜足 |
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| 作者单位： | （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） |
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| 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。
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| 关 键 词： | 荆条 高径比 跨高比 抗压强度 抗弯强度 |
The Influence of Height to Diameter and Span to Diameter Ratios on the Test Precision of Compressive and Bending Properties of Vitex negundo Twigs |
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| GAO Jing,ZHANG Xiao-yan,LU Guo-xin,CHENG Yue,AN Sheng-zu. The Influence of Height to Diameter and Span to Diameter Ratios on the Test Precision of Compressive and Bending Properties of Vitex negundo Twigs[J].Journal of Northwest Forestry University,2014,29(4):214-218. |
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| Authors: | GAO Jing ZHANG Xiao-yan LU Guo-xin CHENG Yue AN Sheng-zu |
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| Institution: | (Key Lab of Forest Resources and Forest Protect of Hebei Province, Agricultural University of Hebei, Baoding, Hebei 071000, China) |
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| Abstract: | In order to research the test methods on axial compressive and bending properties of Vitex negundo twigs, mechanical properties, such as axial compressive and bending strength, maximum bending deflection 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 increased with span to diameter ratio, but decreased with the increase of diameter. |
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| Keywords: | Vitex negundo twigVitex negundo twig height to diameter ratio span to diameter ratio compressive strength bending strength |
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