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中文摘要：
采用自主研发的高精度短纤维力学性能测试仪（SF-I）研究毛竹、杉木、苎麻单根纤维纵向拉伸性能及水分对其影响,研究毛竹单根纤维循环加载的纵向拉伸变化。结果表明：所测纤维均表现出明显的线弹性行为;4年生毛竹平均断裂强度为1710MPa,平均弹性模量为27.1GPa,平均断裂伸长率为7.0%;毛竹、杉木、苎麻纤维的纵向拉伸性能对湿度变化都有一定的敏感性,其中,苎麻最敏感;在相同的温湿度条件以及相同的载荷下对纤维进行多次反复加载,纤维发生的应变会逐渐减小。
英文摘要：
The objective of this paper was to evaluate a micro-tensile testing technique for short length single fiber longitudinal tensile property testing.A newly designed micro tension tester （SF-I） was used to test different cellulosic single fibers, including bamboo, Chinese Fir and ramie. With the new tester, the effect of ambient humidity and the humidity cycle on the tensile properties of the fiber was investigated. The load-deflection curve of single fiber testing showed that a linear behavior presented to failure. The mean value of tensile strength,tensile modulus and strain for the 4-year-old bamboo fiber was 1 710 MPa,27.1 GPa,7.0%,respectively. The bamboo,Chinese Fir and ramie single fiber are all moisture-sensitive. Among the fibers investigated, ramie fiber shows the most sensitive to the humidity. Furthermore, the strain of fibers was smaller and smaller after be repeated tensile under the same load.
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