【作者】 牛国权； 苑淑娟； 刘静； 张永亮； 王成龙； 周丹丹；

【Author】 Niu Guoquan Yuan Shujuan Liu Jing Zhang Yongliang Wang Chenglong Zhou Dandan (Inner Mongolia Agricultural University)

【机构】 内蒙古农业大学；

【摘要】 为了研究柠条与沙地柏的变形特性,采用"加载-卸载-再加载"多次重复拉伸的试验方法,对两种植物代表根(1～1.5 mm)根径范围内的单根进行轴向拉伸试验,从弹塑性角度分析其变形特性。结果表明,2种植物6 cm长单根在拉伸初始阶段,试验根所产生的变形均为弹性变形,若荷载超过试验根的弹性极限,试验根的应力状况由弹性状态发展到弹塑性状态,产生塑性变形,进入弹塑性变形阶段;在弹塑性变形过程中,试验根的弹性极限面发生改变,弹性极限提高,达到历史极限荷载的90%以上;试验根经历弹塑性变形阶段后,试验根的弹性模量降低,表现出弹塑性耦合现象。更多还原

【Abstract】 In order to investigate the deformation characteristic of caragana and Sabina roots,and by using the method of many times"load-unload-repeated load"repeated tension,through the axial tension tests on single root of two plants with represented roots(diameter at 1.0-1.5mm),the deformation characteristic of two plants on elnstic-plnstic are analyzed. The results showed that at the first stage of the stretching,single root of the two plants occurs elastic deformation.If the load exceeds elastic limit of the root,the stress condition develops from elastic state to elnstic-plnstic state,single root come into plastic deformation.During the elastic-plastic state process,the elastic limit surface of the root is changed,the elastic limit increases to more than 90%of historical ultimate load.After the elastic-plastic deformation stage,elastic modulus of the root is decreased,and shows elastic-plastic coupling.更多还原