芒草茎秆弯曲特性试验

Study on bending properties of Miscanthus

以湘杂芒2号、芒/南荻杂交种、2年生南荻无性繁殖苗和3年生南荻种子苗为试验对象,测量、计算芒草不同节间含水率、外径、原始截面面积、茎秆截面惯性矩、最大荷载、弹性模量、抗弯刚度等,研究芒草茎秆的弯曲特性。结果表明,湘杂芒2号、芒/南荻杂交种、2年生南荻无性繁殖苗和3年生南荻种子苗的茎秆最大弹性模量分别为6377.07、5162.36、1694.72和1364.92 MPa,最大应力分别为88.37、103.48、39.07和38.25 MPa。4种芒草的弯曲性能差异大,在设计切割、粉碎、夹持机构时,需根据最大值来确定设计参数;芒/南荻杂交种第8茎秆部位置的应力103.48 MPa可取为粉碎设计参数。

Bending properties of miscanthus was investigated by Measuring and analyzing intemode moisture content, outside diameter, original cross-sectionalarea, cross sectional moment of inertia, peak load, elastic modulus and bending rigidity. The results showed big differences in the bending properties among different varieties of miscanthus, and for hybrid miscanthus variety Xiangzamang No.2, hybrid variety between Miscanthus and Triarrhena lutarioriparia, biennial Triarrhena lutarioriparia apogamic seedling and triennial Triarrhena lutarioriparia, the averages of tensile strength were 6 377.07, 5 162.36, 1 694.72 and 1 364.92 MPa, respectively, whose maximum stress were 88.37, 103.48, 39.07 and 38.25 MPa respectively. As the design of cutting, crushing and holding mechanism must be based on the maximum value, the greatest stress presented on the 8th stem of the hybrid variety between Miscanthus and Triarrhena lutarioriparia, which was 103.48 MPa could be considered for crushing machine design.