水土保持通报2012，Vol.32Issue(3)：17-22,6.
4种常见乔木单根拉伸的应力应变曲线分析
Analysis of Stress-Strain Curves for Four Common Arbor Root Systems
摘要
Abstract
In order to investigate the influences of root diameter,root length and tensile rate on stress—strain curve,four common arbor root systems,i.e.,Pinus tabulaeformis,Betula platyphylla,Quercus mongolica and Larix gmelinii,were selected to perform tensile experiments.Results show that the overall stress—strain curve of every single arbor root system is the single-peak curve and does not have the apparent size-shrink phenomenon.Stress—strain curves for the four trees present elastoplastic material characteristics.Under the same loading condition and with the same diameter size,Betula platyphylla performs the tensile mechanical properties close to Quercus mongolica,both of which have larger elastic modulus and tensile strength and smaller elongation;Pinus tabulaeformis and Larix gmelinii have similar mechanical properties,with smaller elastic modulus and tensile strength and larger elongation.With the increase in root length,elastic modulus of Larix gmelinii manifests a downward trend,whereas elastic moduli of the other three trees manifest an increasing trend.Both of the ultimate elongation and tensile strength are negatively correlated with the root length.For Betula platyphylla and Larix gmelinii,the increase in tensile rate makes roots to be failure more easily;elastic modulus and tensile strength are negatively correlated with tensile rate;and ultimate elongation is positively correlated with and the tensile rate.关键词
乔木/应力应变曲线/单根拉伸/弹性模量Key words
arbor/stress-strain curve/single-root tensile/elastic modulus分类
农业科技引用本文复制引用
王萍花,陈丽华,冀晓东,宋恒川,郭峰,汲文献..4种常见乔木单根拉伸的应力应变曲线分析[J].水土保持通报,2012,32(3):17-22,6.基金项目
国家林业局林业公益行业科技专项“华北土石山区典型森林生态系统健康维护机制研究” （）
中国教育部博士基金项目“林木根系拉伸特性的试验研究” （）
国家自然科学基金项目“林木根系基本力学性能研究” （）
青年科学基金项目“林木根系与土壤摩擦锚固性能研究” （）
