苜蓿茎秆的拉伸力学特性试验

本研究对低含水率的苜蓿茎秆不同部位进行了拉伸力学特性试验。结果表明,同一植株不同位置的拉断载荷从顶部到根部呈明显增加趋势,一般根部的拉断载荷是顶部的2～4倍;抗拉强度变化趋势不明显;苜蓿茎秆试样上部、中部和下部的平均直径分别是1.72mm、2.03mm和2.21mm,平均壁厚分别是0.18mm、0.22mm和0.31mm,平均抗拉强度分别为77.06594MPa、96.24907MPa和75.27600MPa,平均载荷分别是59.50628N、105.68330N和121.33230N;验证分析表明,苜蓿茎秆中部和下部的抗拉强度与截面积的相关性较好,上部茎秆的相关性稍差。

Experiment for Alfalfa Stem-tensile and Study for Mechanical Properties

Laboratory experiments were conducted on the mechanical properties of alfalfa stem by an Universal Test Mechine,the sample was at three levels up the stem.The results showed that the average values of the tensile strength were 77.06594,96.24907, 75.27600MPa for the upper,middle and lower levels in the crop,respectively.The average diameter and wall-thickness were 1.72, 2.03 and 2.21mm,0.18,0.22 and 0.31mm,respectively.The average force were 59.50628,105.68330 and 121.33230N respectively. The middle and lower stem had a high relevance in tensile and area crossing after the verification.