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CSME 2025/12
Volume 46 No.6
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579-589
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Evaluating Stress Concentration and Displacement in Mountain Bike Rear Triangle Frames: A Finite Element Approach
Jing-Wei Zheng a and Cai-Wan Chang-Jian b
aGraduate Student, Department of Mechanical Engineering, National Chin-Yi University of Technology, No.57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 411030, Taiwan.
bProfessor, Department of Mechanical Engineering, National Chin-Yi University of Technology, No.57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 411030, Taiwan.
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Abstract:
The evolution of bicycle design has been driven by various user needs, influencing key aspects such as wheel size, handlebar length, and seat shape, all aimed at enhancing the rider's experience (Tomaszewski, 2021). Among these, the frame shape plays a crucial role in determining overall performance and comfort (Hsiao, 2015). Today, two predominant types of frames are in use: one-piece frames, commonly found in city bikes, racing bikes, and U-bikes, are designed for flat terrain or gentle slopes (Adsule, 2024). These frames are less effective at absorbing shocks and are unsuitable for handling rough impacts. In contrast, mountain bike frames, designed for steep mountain roads or rugged trails, feature a more complex structure divided into front and rear triangles. The front triangle connects the handlebars to the front wheel, while the rear triangle houses the braking system. This split-frame design improves impact absorption but introduces structural challenges, particularly in the rear triangle, which tends to be weaker due to its pivot system and disc brake integration. This study provides an in-depth analysis of the rear triangle's structural performance through three key tests: disc brake fatigue analysis, rear triangle fatigue analysis, and drop impact testing. Fatigue and impact simulations focus on identifying stress concentration points and displacement patterns to assess the frame's weaknesses. The results are compared with actual experimental conditions, with particular attention given to displacement and stress concentration, as they serve as indicators of potential frame vulnerabilities. Due to the significant external forces acting on it, the rear triangle is especially prone to noticeable force changes, making it an ideal focus for detailed analysis.
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Keywords: Finite Element Analysis, Mountain Bike Rear Triangle, Fatigue.
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©
2025
CSME , ISSN 0257-9731
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