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The Research on Performances of Fiber Reinforced Salix Scrimber

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Tutor: ZhaoZhongSheng
School: Northeast Forestry University
Course: Wood Science and Technology
Keywords: Salix,Scrimber,Glass fiber,Coir fiber,Nondestructive testing
CLC: TS653
Type: Master's thesis
Year:  2013
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Abstract:
This paper mainly discusses the manufacturing process of Salix Scrimber and the influence on the physical and mechanical properties of Salix Scrimber for adding glass fiber and coir fiber. The research include that the optimized manufacturing process of Salix Scrimber; the effect on physical and mechanical properties of Salix Scrimber for adding different proportions of glass fiber bundle; the influence on the physical and mechanical performance of Salix Scrimber for adding glass fiber, which with various morphology, different paved ways and different glue type; the effect on physical and mechanical properties of Salix Scrimber for adding different proportions of coir fiber rope. Through the correlation analysis between the dynamic mechanical properties and the static one, the suitable predicting method was chose for the mechanical properties of Salix Scrimber, which establish the foundation for the prediction of mechanical properties on Scrimber.Through the preliminary research on the physical and mechanical properties of Salix Scrimber, it was found that Salix Scrimber could be used as building materials. An orthogonal test was designed, and the hot-pressing temperature, hot-pressing time and glue content were factors to be considered. Intuitive analysis and analysis of variance were carned out to confirm the optimized process manufacturing Salix Scimber and the most important factor on the influence of Salix Scrimber. Results showed that the glue content was the most important factor, and the optimal process for manufacturing Salix Scrimber was:hot-pressing temperature130℃, hot-pressing time1.5min/mm and glue content9%. At the same time, the poplar veneer was laminated on the surface of Salix Scrimber. The results showed that the mechanical properties were improved greatly, but the ratio of thickness swell after absorbing water for24h (24hTS) increased.On the basis of the optimal manufacturing process of Salix Scrimber, the mechanical properties of Salix Scrimber adding different proportion glass fiber bundles were studied. The results showed that:when adding7%of glass fiber bundles, the physical and mechanical properties of Salix Scrimber were excellent. Compared with the specimen without adding glass fiber, the modulus of elasticity (MOE) was increased by19.4%, the modulus of rupture (MOR) was increased by9.2%, the impact toughness value (IT) was increased by12.4%, and the24hTS was decreased by9.7%. Then add the glass fibers with various morphology, different paved ways and diverse glue type, to research the effect on physical and mechanical properties of Salix Scrimber. The results showed that:when the glass fiber mesh was immersed with Diphenyl-methane-diisocyanate (MDI) adhesive and paved double, the physical and mechanical performances of Salix Scrimber were the best. Compared with the controls, the MOE was increased by8.1%, and the MOR was increased by18.7%, the internal bonding strength (IB) value increased by27.4%, the IT value was increased by41.2%, and the24hTS value was reduced by46%.Through analyzing the effect on physical and mechanical properties of Salix Scrimber, which was added different proportions of coir fiber rope, the results indicated that:5%coir fiber rope content would receive better physical and mechanical performances. Compared with the controls, the MOE was increased by7.9%, and the MOR was increased by14.2%, the IT value was increased by20.5%. The IB value decreased, and24hTS value increased, but they were within the range of the OSB standard.The rule of mixtures was adopted to predict the modulus of elasticity of fiber reinforced Salix Scrimber. By comparing the measured values and predicted values, the results showed that:there was not a linear relationship on the MOE of fiber reinforced Salix Scrimber. It was showed that the rule of mixtures is not applicable to predict the MOE of the composite.In this paper, flexural vibration test and longitudinal resonance test was adopted as nondestructive testing method, which were used to test the dynamic mechanical properties of Scrimber. The regressive analysis was carried out respectively to confirm the better nondestructive testing method, which was between dynamic modulus of elasticity and the static one. The results show that the flexural vibration was more reliable to predict the mechanical properties of Salix Scrimber.
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