作　　者： ; ; ; ; ;

机构地区： 湖南农业大学工学院

出　　处： 《湖南农业大学学报（自然科学版）》 2011年第3期329-332,共4页

摘　　要： 为了给苎麻切割器的设计及切割动力学分析提供茎秆的力学性能参数,以苎麻成熟期底部茎秆为材料,对茎秆及其木质部进行了弯曲和扭转试验,得到其弯剪模量分别为155.7、252.9MPa,剪切模量分别为42.1、44.8MPa;对木质部和韧皮部进行了拉伸和压缩试验,得到其拉伸弹性模量分别为1876、481MPa,压缩弹性模量分别为154.2、50.9MPa。运用复合材料的微观力学研究方法,确定了茎秆的拉伸弹性模量为1552MPa、压缩弹性模量为102.4MPa、同性面泊松比0.22及异性面泊松比为小于0.099;木质部的同性面泊松比为0.72、异性面泊松比为小于0.068;韧皮层弯剪模量为72.3MPa,剪切模量为24.2MPa,同性面泊松比为0.05及异性面泊松比为小于0.335。 In order to provide parameters of mechanical properties for designing Ramie cutter and for analyzing of kinetics of shearing process, this paper investigated the mechanical properties of the ramie bottom stalk in harvesting period. Bending and twisting tests showed bend shear modulus were 155.7 MPa and 252.9 MPa and shearing modulus were 42.1 MPa and 44.8 MPa for stem and xylem respectively. The tensile elastic modulus were 1 876 MPa and 481 MPa and the compression modulus were 154.2 MPa and 50.9 MPa for Xylem and elongated layer respectively according to stretching and compression test. Then micro mechanics research methods of composite materials was applied to the stalk and determined the following parameters： the tensile elastic modulus, compression modulus of elasticity, PRXY and NUXY was 1 552 MPa, 102.4 MPa, 0.22, less than 0.099 for the stem respectively; and for the xylem, PRXY was 0.72 and NUXY less than 0.068; bend shear modulus, shear modulus, PRXY and NUXY of elongated layer was 72.3 MPa and 24.2 MPa, 0.05 and less than 0.335 respectively.

关 键 词： 苎麻 底部茎秆 力学特性 弹性参数

领　　域： [农业科学] [农业科学]