加载速度对直根段、侧根分支处抗折强度的影响  

Effect of Loading Speed on Flexural Strength at Straight Root and Lateral Root Branch

作　　者：王晨嘉 刘静[1] 武艺儒 杨东旭[1] 刘嘉伟[1] 张强[1] 

机构地区：[1]内蒙古农业大学沙漠治理学院,内蒙古呼和浩特010011

出　　处：《内蒙古林业科技》2017年第2期6-9,23,共5页Journal of Inner Mongolia Forestry Science and Technology

基　　金：国家自然科学基金项目"根系固土抗蚀受损后自我修复的力学特性"(51364034);内蒙古自治区水利科技项目"神东煤矿采煤塌陷区水土保持植被配置研究"资助

摘　　要：以3~4年生柠条、沙柳、沙棘、白沙蒿为研究对象,选取直径1.5~2 mm和3~3.5 mm 2个径级根系,采用TY-8000伺服式强力机测定相同径级的直根段和侧根分支处对于加载速度的响应。研究结果表明:4种植物同径级直根段抗折强度均大于侧根分支处抗折强度,且抗折强度随加载速度增加而增大。最大加载速度与最小加载速度下抗折强度差异性显著。当加载速度为860 mm/min和10 mm/min,根径1.5~2 mm,柠条直根段、侧根分支处的抗折强度分别为63.79 Mpa、39.20 Mpa和50.76 Mpa、27.40Mpa;沙柳分别为25.54Mpa、26.05Mpa和19.22 Mpa、14.55 Mpa;沙棘分别为9.65 Mpa、6.76 Mpa和6.17 Mpa、4.28 Mpa;白沙蒿分别为6.40 Mpa、2.67 Mpa和4.96 Mpa、2.35 Mpa。同样,根径3~3.5 mm时,柠条直根段、侧根分支处的抗折强度分别为53.42 Mpa、33.00 Mpa和41.17 Mpa、19.38 Mpa;沙柳分别为20.03 Mpa、16.22 Mpa和16.60 Mpa、10.60 Mpa;沙棘分别为7.76 Mpa、3.47 Mpa和5.41 Mpa、2.27 Mpa;白沙蒿分别为5.33 Mpa、2.39 Mpa和3.26Mpa、1.58 Mpa。Taking 3 - 4 - year Caragana korshinskii, Salix psammophila, Hippophae rhamnoides and Artemisia blepharolepis as the research objects, choosing two root system with the diameter at 1.5 ~ 2 mm and 3 - 3.5 mm, the responses of straight root and lateral root branch with same diameter to loading speed have been measured by use of TY - 8000 servo - type powerful machine. The results show that for four plants, the flexural strength at straight root is stronger than the one at lateral root branch, and the flexural strength has enlarged with the increasing of loading speed. There is significant difference between the flexural strength at the maximum and the minimum load- ing speed. When loading speed at 860 mm/min and 10 mm/min and root diameter at 1.5 - 2 mm, the flexural strength at straight root and lateral root branch of Caragana korshinskii is 63.79 Mpa, 39.20 Mpa and 50. 76 Mpa, 27.40 Mpa separately, the one of Salix psammophila is 25.54 Mpa, 26.05Mpa and 19.22 Mpa, 14.55 Mpa sepa- rately, the one of Hippophae rhamnoides is 9.65 Mpa, 6. 76 Mpa and 6. 17 Mpa,4.28 Mpa separately, the one of Artemisia blepharolepis is 6.40 Mpa, 2. 67 Mpa and 4. 96 Mpa, 2. 35 Mpa separately. When loading speed at 860 mm/min and 10 mm/min and root diameter at 3 ~ 3.5 mm, the flexural strength at straight root and lateral root branch of Caragana korshinskii is 53.42 Mpa, 33.00 Mpa and 41.17 Mpa, 19.38 Mpa separately, the one of Salix psammophila is 20.03 Mpa, 16.22 Mpa and 16.60 Mpa, 10.60 Mpa separately, the one of Hippophae rhamnoides is 7.76 Mpa, 3.47 Mpa and 5.41 Mpa, 2. 27 Mpa separately, the one of Artemisia blepharolepis is 5.33 Mpa, 2.39 Mpa and 3.2 6Mpa, 1.58 Mpa separately.

关 键 词：加载速度 直根段 侧根分支处 抗折强度 

分 类 号：S793[农业科学—林木遗传育种]