The structure of the bicycle is generally composed of several components, one of which is the frame. Not all fibers are created equal given their differing physical properties, bast and core fibers have different ideal end uses. With respect to both, mechanical and thermo-mechanical properties, hemp fiber composites with rHDPE matrix performed better than composites with vHDPE matrix. The properties of hemp fibres were found to be good enough to be used as reinforcement in composite materials. Any section of hemp fibre mat will contain fibre of varying cross section and hence different tensile properties. The effect was more pronounced for fibres heated in air than for those in inert (nitrogen) environment. It shows that thermal degradation of hemp fibres starts at around 150–200°C and becomes rapid at around 250°C. After chemical treatment of the fiber, the density and weight loss were measured. Interfacial shear strength gives a measure of the strength of fibre/matrix bonding. Then a new experiment was set up whereby a hemp fibre sample, conditioned at 23°C and 50% RH, was kept in the furnace at increasing temperatures, starting at 40°C up to 140°C (in 10°C intervals) for a dwell time of one hour and the weight change in the sample was recorded. The resulting graph is shown in Figure 6. where is the surface energy of water and is the contact angle of water. The purpose of this part of the study was to determine the weight loss behaviour of hemp fibres when kept in a desiccator and when exposed to elevated temperature and thus to determine the equilibrium moisture content of the fibres. It is a modular high performance computer-controlled tensiometer which can be used for the measurement of various surface properties. A similar loss in moisture was reported by Gassan and Bledzki [15] for jute fibres dried in vacuum furnace. The optimum fiber content was determined according to the test results. Mounted fibres were placed in the grips of an Instron 1162 tensile testing machine. Properties of Hemp fiber. The polar component of surface energy is greater than the dispersive component, which is consistent with the polar nature of hemp fibres. Vacuum infusion process was used to manufacture hemp fiber reinforced epoxy composites. It is difficult to say which method is more accurate than the other. Hemp can produce 250% more fiber than cotton and 600% more fiber than flax using the same amount of land. gated the mechanical properties of banana fiber fortified with epoxy resin as matrix material. The dependence of fibre strength on fibre width was observed for fibres used for tensile testing in this study as shown in Figure 10. One study [13] reports IFSS values of 10 and 12 MPa for coated glass fibres in polyester resin. The thermal degradation of natural fibres results in change in odour and colour and deterioration in mechanical properties of natural fibres. [4] have shown that heating the fibres between 160°C and 260°C results in softening of lignin leading to opening of fibre bundles into individual fibres. Composites made of hemp fibers with thermoplastic, thermoset, and biodegradable matrices have exhibited good mechanical properties. For determining the surface properties (surface energy and dynamic contact angle) of hemp fibres, a KSV Sigma 700 Tensiometer was used. Van de Velde and Kiekens [28] used the same technique to determine surface energy of flax and glass fibres. Hemp fiber is a lustrous fiber, has characteristic nodes and joints of linen, but the central canal is wider. In this research all the fibres tested showed approximately linear elastic behaviour. Acrylonitrile has been successfully used in improving the thermal stability of jute [8] and sisal [9] fibres. 8.2 Effect of pre-treatment of hemp 47 8.3 Effect of microfibril angle and twisting angle 48 9 Composites reinforced with hemp fibres 50 9.1 Effect of fibre orientation on mechanical properties 50 This issue may be overcome by exposing the fibre surface to physical and chemical treatments to make them more compatible with polymer matrices. The processed hemp fibers show a high tenacity, high absorption properties up to 95% against IR and UV radiation, and highest water uptake (Laib 1999); they are not conductive and provide a natural low flammability. The total surface energy of hemp fibre is then the sum of dispersive and polar components of surface energy. Mechanical and Thermal Properties of Hemp Fiber-Unsaturated Polyester Composites Toughened by Butyl Methacrylate. 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