Improvement in Strength Properties of Ramie Fibers and Ramie Yarn Green Composites through Cyclic Tensile Loading
Improvement in Strength Properties of Ramie Fibers and Ramie Yarn Green Composites through Cyclic Tensile Loading
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通过循环拉伸加载提高苎麻纤维和苎麻纱绿色复合材料的强度性能
DOI：
10.6089/jscm.35.56
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Ohgi
中科院分区：
文献类型：
--
作者：
Takafumi Doi;Masahiro Ito;Takeshi Kaji;R. Nakamura;K. Goda;J. Ohgi
本研究的目的是通过机械处理提高天然纤维和天然纱线绿色复合材料的强度和刚度，并与玻璃纤维复合材料的力学性能进行比较。对单根麻纤维施加50%或70%初始强度的循环拉伸应力5次或20次，对麻纱绿色复合材料施加20次或100次循环拉伸应力。当循环应力为70%，循环次数为20次时，原丝纤维的拉伸强度比初始值提高了约50%，而丝光麻纤维的强度比原始值提高了约20%。另一方面，机械处理对麻纱绿色复合材料的强度影响不大，比未经处理的复合材料提高约8%，而循环加载的绿色复合材料的杨氏模量显著提高，比未经处理的复合材料提高56%~67%。改进后的复合材料的杨氏模数与普通玻璃纤维复合材料的水平相当。
The purpose of this study is to improve the strength and stiffness of natural fibers and natural yarn green composites through mechanical treatment, and to compare the mechanical properties of the composites with those of glass fiber composites. Cyclic tensile stress at 50% or 70% level of their initial strengths was applied five or twenty times for single ramie fibers, twenty or a hundred times for ramie yarn green composites. Tensile strength of as-supplied ramie fibers was improved approximately 50% higher than their initial value, for the cyclic stress at their 70% level and the number of cycles at twenty, while mercerized ramie fibers was improved in strength approximately 20% higher than the original value. On the other hand, the mechanical treatment was not so largely affected in strength for ramie yarn green composites, approximately 8% higher than that of the untreated composites, while Young's moduli of cyclic-loaded green composites were significantly improved, i.e. 56% to 67% higher than that of untreated composites. Young's moduli of the improved composites are comparable to the level of usual glass fiber composites.