1992 Fiscal Year Final Research Report Summary
Research on the anisotropy in the mechanical property of high performance fibers
| Project/Area Number |
03453110
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性・高分子材料（含機械材料）
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KAWABATA Sueo Kyoto University, Engineering, Professor, 工学部, 教授 (10025885)
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| Co-Investigator(Kenkyū-buntansha) |
SAIJYO Kenji Kyoto University, Engineering, Education assistant, 工学部, 教務職員 (60115847)
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| Project Period (FY) |
1991 – 1992
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| Keywords | High performance fiber / Aramid fiber / Anisotropy in mechanical property / Torsion / creep / fatigue prediction / Shift factor / シフトファクター |
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| Research Abstract |
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.
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