scholarly journals Bicycle frame from hemp fibre filament wound composites

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Arisara Chaikittiratana ◽  
Sacharuck Pornpeerakeat ◽  
Kerati Suwanpakpraek ◽  
Sitthichai Limrungruengrat ◽  
Joshua Dietz-Röthlingshöfer
Keyword(s):  
Finite Element ◽  
Static Load ◽  
Epoxy Composite ◽  
Filament Winding ◽  
Epoxy Composites ◽  
Composite Tubes ◽  
Element Analysis ◽  
Hemp Fibre ◽  
Filament Wound ◽  
Bicycle Frame

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.

scholarly journals Axial and Radial Compression Behavior of Composite Rocket Launcher Developed by Robotized Filament Winding: Simulation and Experimental Validation

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 517
Author(s):  
Rajesh Mishra ◽  
Bijoy Kumar Behera ◽  
Sayan Mukherjee ◽  
Michal Petru ◽  
Miroslav Muller
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Hybrid Composites ◽  
Computational Modelling ◽  
Filament Winding ◽  
Radial Compression ◽  
Element Analysis ◽  
Compression Behavior ◽  
Resin Impregnation ◽  
Filament Wound

The principal objective of the work is to compare among carbon-glass filament wound epoxy matrix hybrid composites with a different fiber ratio made by robotized winding processes and optimize the geometry suitable for the Rocket Propelled Grenade Launcher. ANSYS based finite element analysis was used to predict the axial as well as radial compression behavior. Experimental samples were developed by a robot-controlled filament winding process that was incorporated with continuous resin impregnation. The experimental samples were evaluated for the corresponding compressional properties. Filament wound tubular composite structures were developed by changing the sequence of stacking of hoop layers and helical layers, and also by changing the angle of wind of the helical layers while keeping the sequence constant. The samples were developed from carbon and glass filaments with different carbon proportions (0%, 25%, 50%, 75%, and 100%) and impregnated with epoxy resin. The compressional properties of the tubular composites that were prepared by filament winding were compared with the predicted axial and radial compressional properties from computational modelling using the finite element model. A very high correlation and relatively small prediction error was obtained.

Uniform Design and Dynamic Finite Element Analysis for Permanent Deformation Improvement of an On-Road Bicycle Frame Undergoing the Drop-Mass Impact Test

2014 ◽  
Vol 933 ◽  
pp. 229-234 ◽  
Author(s):  
Yung Chang Cheng ◽  
Cheng Kang Lee ◽  
Cho Pei Jiang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Impact Test ◽  
Permanent Deformation ◽  
Uniform Design ◽  
Element Analysis ◽  
Dynamic Finite Element ◽  
Dynamic Finite Element Analysis ◽  
Drop Mass ◽  
Bicycle Frame

The purpose of this paper is to present the use of uniform design of experiments method and dynamic finite element analysis in improving the permanent deformation of an on-road bicycle frame which undergoes the drop-mass impact test. Firstly, four dimensional parameters of the bicycle frame are selected as the control factors to be improved. Then, uniform design method is used to construct a set of experiments. Each experiment denotes a specific design of frame. Next, for each experiment, the dynamic finite element analysis package ANSYS/LS-DYNA is employed to simulate the behavior of bicycle frame which undergoes the drop-mass impact test and determine the permanent deformation of the frame. Lastly, the best frame of all the experiments which causes the smallest permanent deformation is selected as the improved version of design. Compared with the original design which causes a permanent deformation of 8.458 mm, the improved version causes a permanent deformation of 7.467 mm. The rate of improvement is 11.7 %.

Impact Fracture of Polymer-Filled Braided Composite Tubes

2019 ◽  
Vol 36 (3) ◽  
pp. 305-313
Author(s):  
S. F. Hwang ◽  
H. L. Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Progressive Failure ◽  
Composite Tubes ◽  
Element Analysis ◽  
Composite Tube ◽  
The Finite Element Analysis ◽  
Experiment And Simulation ◽  
Crushing Behavior ◽  
Filled Composite

ABSTRACTThree types of polymer including polyurethane, polyethylene, and polysulfone were used as filler inside composite tubes to evaluate their effects on the crashworthiness. The composite tube consisting of carbon fiber fabric and polyurethane was fabricated by resin transfer molding and subjected to impact loading. In addition, the finite element analysis with progressive failure and delamination was used to simulate the crushing behavior of the polymer-filled composite tube. From the comparison between experiment and simulation, the finite element analysis is reliable, could reasonably describe the crushing behavior of the polymer-filled tube, and has nice prediction on the crashworthiness performance. From both the experiment and simulation results, the polyethylene-filled composite tube has clearly higher specific absorbed energy than the hollow composite tube, and polyethylene could be considered as an effective filler. However, the other two types of polymer filler have no clear effect.

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