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Research on the anisotropy in the mechanical property of high performance fibers

高性能纤维力学性能各向异性研究

基本信息

批准号：
03453110
负责人：
KAWABATA Sueo
金额：
$ 4.42万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The mechanical property of fibers, especially high performance fibers have a strong anisotropy. These properties are important for the design of advanced composite applying these fibers, however, the detail of these properties has not been explained. This research project has developed the system of measuring directly the single fiber properties as follows. (1) Accurate longitudinal tensile tester designed for single fiber measurement. (2) Longitudinal compression tester (3) Transverse compression tester, (4) Torsion tester, (5) Poisson's ratio measuring tester. The tester of (2) measure the micro-composite consisted of unidirectional fibers instead of single fiber. By using these testers, the measurement of various fibers have been carried out. Some of result are as follows.(1) Fiber longitudinal tensile property and compression property were well connected and explained on stress-strain curve.. The compression property of high performance fibers is weaker than tensile property and has stress yielding at very low stress level. (2) The shear strength of high performance fibers such as Aramid fibers is much weaker than the tensile property. It was found that the fiber failure is caused by the shear failure when the fiber is subjected complicate deformation composite or textile material. (3) Prediction equation of shear fatigue was developed. (4) The anisotropy in fiber viscoelasticity was also measured for these highly oriented fibers.

纤维，特别是高性能纤维的力学性能具有很强的各向异性。这些性能对于应用这些纤维的先进复合材料的设计是重要的，然而，这些性能的细节尚未被解释。本课题研制了单纤维性能直接测量系统。(1)用于单纤维测量的精确纵向拉伸试验机。(2)纵向压缩试验机（3）横向压缩试验机，（4）扭转试验机，（5）泊松比测量试验机。（2）的测试仪测量由单向纤维组成的微复合材料而不是单纤维。利用这些测试仪，对各种纤维进行了测试。部分结果如下。(1)纤维的纵向拉伸性能和压缩性能在应力-应变曲线上有很好的联系和解释。高性能纤维的压缩性能弱于拉伸性能，并且在很低的应力水平下具有应力屈服。(2)高性能纤维如芳纶纤维的剪切强度比拉伸性能弱得多。研究发现，当纤维在复合材料或纺织材料中受到复杂变形时，纤维的破坏主要是剪切破坏。(3)建立了剪切疲劳预测方程。(4)还测量了这些高度取向纤维的纤维粘弹性的各向异性。