环境湿度对火麻单纤维力学性能的影响  

Influence of Environmental Humidity on the Mechanical Properties of Hemp Elementary Fiber

作　　者：杨艳丽[1] 李文涛 朱奇鹏 李红波[1] YANG Yanli;LI Wentao;ZHU Qipeng;LI Hongbo(Shanxi Agricultural University,College of Agricultural Engineering,Taigu 030801,Shanxi,China)

机构地区：[1]山西农业大学农业工程学院,山西太谷030801

出　　处：《中国麻业科学》2022年第6期338-344,共7页Plant Fiber Sciences in China

基　　金：山西省省筹资金资助回国留学人员科研项目(2021-075);山西省自然科学基金项目(201901D111220)。

摘　　要：火麻韧皮纤维束强度高,韧性好,其力学性能主要由单纤维决定。研究采用离析法从火麻韧皮纤维束中提取出单纤维,利用纤维微拉伸测试技术对其开展了力学测试,同时考虑了环境湿度对单纤维力学参数的影响。结果表明,环境湿度从20%增加到70%的过程中,火麻单纤维的弹性模量和抗拉强度随环境湿度的增加逐渐降低,断裂应变则随着环境湿度的增加而逐渐增加,其中,弹性模量从29.88 GPa下降至8.30 GPa,抗拉强度从427.32 MPa降至150.58 MPa,而断裂应变则从2.26%增加至2.93%。The hemp bast fiber bundle has high strength and good toughness, and its mechanical properties are mainly determined by elementary fiber. In this paper, the elementary fiber was extracted from the hemp bast fiber bundle by the segregation method, and the mechanical properties of the elementary fiber were tested by micro-tensile technology. At the same time, the influence of environmental humidity on the mechanical parameters of the elementary fiber was considered. The test results showed that the elastic modulus and tensile strength of the elementary hemp fiber decreased with the increase of environmental humidity from 20% to 70%, while the failure strain increased with the increase of environmental humidity. The elastic modulus decreased from 29.88 GPa to 8.30 GPa, the tensile strength decreased from 427.32 MPa to 150.58 MPa, and the failure strain increased from 2.26% to 2.93%.

关 键 词：火麻 单纤维 拉伸 力学性能 环境湿度 

分 类 号：S563.3[农业科学—作物学] TB12[理学—工程力学]