Study On The Tensile Mechanical Properties Of 4 Kinds Of Single Roots

Tensile properties of single roots which is the important part of the plant roots biomechanical characteristics, is the research basic of plant roots on soil reinforcement. The study based on the principle of mechanics of materials,elastic-plastic mechanics and axial tensile test, research on the single root tensile properties of Caragana microphylla, Salix psammophila, Sabina vulgaris and Artemisia sphaerocephala, and the influence of different factors on tensile properties. Conclusions are as follows:The anti-tension of four kinds of single roots and diameter shows a positive power function, tensile strength declines in different degree with root diameter increased. Four kinds of single roots compared, anti-tension and tensile strength of Caragana microphylla> Salix psammophila> Sabina vulgaris> Artemisia sphaerocephala.The main deformation types of four kinds of single roots is up-convex curve, the main deformation properties is elastic-plastic deformation, and exists elastoplastic coupling phenomenon. Constitutive-curve consists of elastic deformation stage and elastic-plastic deformation stage,with root diameter increased, elastic limit stress is declined, elastic limit strain changes is not obvious. The creep course of four kinds of represented roots may divided into initial creep stage and stable creep stage, the strain increased as the load increased, with root diameter and root length increased, the changes of stain are different.The anti-tension and tensile strength of Caragana microphylla in vigorous growth period is greater than early growth period, the other three plant roots are opposite. The tensile strength increased as the loading speed increased, with soil moisture and root length increased, the tensile strength is declined. When the total cross sectional area remains constant, the more quantity of roots, the greater its anti-tension. The elastic limit in early growth period is higher than vigorous growth period. with the loading speed increased, ultimate stress and elastic limit stress increased slowly. The influence of Soil moisture and root length for deformation properties has no obvious law.