Abstract
This work presents an initial study for hemp fibre produced in Thailand. The study focuses on the application of the filament winding technique in the production of hemp-epoxy composite tubes for a bicycle frame. The motivation is to produce hemp fibre composites from locally available resources in Thailand. For the initial trail, existing bicycle steel tubes were replaced by ±45° filament wound hemp-epoxy composites with thin aluminium inner layers. The mechanical properties of the hemp-epoxy composites were studied according to the ASTM standard. Two static load cases were chosen and considered for a 100 kg cyclist sitting on the saddle and pedalling while standing. The internal forces and moments were calculated for the frame and frame tubes. The stress and buckling analyses were performed using the finite element method for frame tubes considering the above loading cases. The finite element analysis shows that hemp-epoxy composite tubes with ±45° fibre orientation can be used as bicycle frame tubes and meet the design specifications under the considered static load conditions. The filament winding process was accomplished successfully at KMUTNB using an automated desktop filament winding machine.
Highlights
Introduction and backgroundFor over a thousand years, humankind has been using hemp bast fibres for the production of textiles and ropes
This study explores the possibility of an alternative utilisation of Thai Hmong hemp fibre as long fibre reinforcement in structural composites
In this work mechanical behaviour of filament wound hemp-epoxy composites made from hemp fibres produced by the Thai Hmong hill tribe was studied
Summary
For over a thousand years, humankind has been using hemp bast fibres for the production of textiles and ropes. Hemp fibre offers an acceptable specific strength and modulus. Despite disadvantages such as high moisture absorption, hydrophilic surface and variability of properties, hemp fibre still has many advantages over synthetic fibres, e.g. glass, carbon or aramid fibres, which include a lower carbon footprint, lower production energy, sustainable availability, less abrasiveness, good thermal, acoustic insulation and damping properties [1,2,3]. This study explores the possibility of an alternative utilisation of Thai Hmong hemp fibre as long fibre reinforcement in structural composites. A preliminary study on the production of composite tubes from Thai hemp fibre using filament winding process was carried out. Properties of hemp-epoxy composites and the possibility of employing hemp composite tubes for structural applications such as bicycle frame tubes were investigated and are presented
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