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为了研究根系的弹塑性特征,采用多次重复拉伸的试验方法,对沙柳、白沙蒿1mm~1.5mm根径范围内的单根进行轴向拉伸试验,分析其弹塑性变形特点。结果表明,两种植物6 cm长单根在拉伸初始阶段,试验根所产生的变形为弹性变形,若荷载超过试验根的弹性极限,应力状况由弹性状态发展到弹塑性状态,试验根产生塑性变形;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,表现出明显的弹塑性耦合现象。
In order to study the elasto-plastic characteristics of the root system, a series of repeated tensile tests were carried out to test the axial tensile test of the roots of Salix psammophila and Artemisia sphaerocephala in the range of 1 mm to 1.5 mm. The elasto-plastic deformation characteristics were analyzed. The results showed that the deformation of the test root was deformed elastically when the single root of 6 cm long was in the initial stage of elongation. If the load exceeded the elastic limit of the test root, the stress state developed from the elastic state to the elastic-plastic state, Plastic deformation. During the elastic-plastic deformation, the ultimate elastic limit of the test root changed, the elastic limit increased, reaching more than 90% of the historical limit load. After the experimental root undergoing the elastic-plastic deformation stage, the elastic modulus of the test root decreased, A clear elastic-plastic coupling phenomenon.