Study on Preforming of Continuous Bamboo Fiber and Reinforced Epoxy Composite
碩士 === 國立成功大學 === 航空太空工程學系 === 107 === The continuous bamboo fiber (BF) reinforced epoxy (EP) composites were fabricated using bamboo fibers treated in different alkali concentrations. Tensile and interfacial shear strength of these composites were compared to select the alkali concentration for the...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2019
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| Online Access: | http://ndltd.ncl.edu.tw/handle/99v779 |
| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 107 === The continuous bamboo fiber (BF) reinforced epoxy (EP) composites were fabricated using bamboo fibers treated in different alkali concentrations. Tensile and interfacial shear strength of these composites were compared to select the alkali concentration for the treatment process that results in a higher strength. The unidirectional and bidirectional BF/EP composites were fabricated using the selected BF alkali treatment process. Tensile properties were measured for the unidirectional and bidirectional BF/EP composites with different fiber volume fractions. The unidirectional BF/EP composite has good reinforcement effect in the fiber direction. However, the measured transverse strength is weaker than the epoxy. For bidirectional BF/EP composites, tensile strengths in both the longitudinal and transverse orientation all shows some improvement as compared to epoxy. In order to fabricate bamboo fiber reinforced composites with non-planar geometric shapes. The study investigated the deformation and spring back behaviors of the single BF and BF mat under a bending preforming test. The result shows that the [0/90] BF mats can be perfectly preformed without spring back after bending under the conditions of a moisture content of 58% and heating temperature of 140°C for 1 hour. The internal structure of BF with moisture will expand and soften that make the fibers to deform plastically under external stresses. The single BF preforming test and stress relaxation test was conducted to confirm the above result. Higher heating temperature and moisture content of BF during preforming process can reduce the spring back effect.
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