以成熟毛竹为研究对象,在显微镜下从竹纤维鞘中成功切割出竹纤维束拉伸试样,并应用微拉伸技术测量其纵向拉伸强度和模量。通过对机械剥离的单根维管束以及竹片小试样进行拉伸对比,获得竹纤维鞘拉伸弹性模量和强度的间接测量值和计算值。结果显示,竹纤维束的拉伸弹性模量和强度平均值分别为42.72 GPa和729.25 MPa,介于竹纤维鞘的间接测量值和计算值之间,并与已有的研究结果也吻合得较好,表明竹纤维束试样的测试结果可以代表竹纤维鞘的整体力学性能。同时,笔者提出了在细观尺度下研究竹子力学特性的关键实验技术。
Abstract
In this paper, tensile samples of bamboo fiber bundle are successfully dissected from the fiber sheaths of moso bamboo under the aid of a light microscope. The tensile modulus and strength were measured with a microtensile tester consequently. For comparison, samples of single vascular bundles(containing both fiber sheaths and some conductive tissues)and bamboo slivers with different fiber contents were also fabricated and tested. The tensile modulus and strength of the fiber bundles were 42.72 GPa and 729.25 MPa, respectively, located between the values obtained by the latter two methods. The result also agreed well with several published reports, which indicated the prepared bamboo fiber bundles could well represent the real performances of bamboo fiber sheaths. The present paper not only proposed a well-established key methodology for studying the mechanical behaviors of bamboo at microscopic scale, but also provided basic data for the development of bamboo fiber bundles reinforced polymer composites and the multiscale simulation of bamboo mechanical behavior.
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基金
收稿日期:2013-03-01 修回日期:2013-06-28
基金项目:国家自然科学基金项目(31070491)
第一作者:安晓静,硕士生。*通信作者:余雁,研究员。E-mail: yuyan9812@icbr.ac.cn。
引文格式:安晓静,王昊,李万菊,等. 毛竹纤维鞘的拉伸力学性能[J]. 南京林业大学学报:自然科学版,2014,38(2):6-10.
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