Abstract
AbstractThe shock breaker is one of the most important parts of a motorcycle, which functions as a vibration damper. This study aims to analyze the causes of motorcycle shock breaker failure. The research method used is comprised of visual observation, chemical composition testing, Vickers hardness testing, scanning electron microscopy-energy dispersive X-ray spectroscopy analysis, and tensile testing of a damaged shock breaker. From visual observation, it is found that the damage can be classified as a fatigue fracture, forming a damage pattern at 45°. The chemical composition testing results of the shock breaker fractures show that the material includes low-carbon alloy steel (of ST42 series) with a carbon content of 0.162%. The average hardness value of the damaged part of the shock breaker was increased to 204.87 HV, compared with 171.02 HV in areas far from the damage. The difference in hardness in the shock breaker was caused by the high stress acting on the shock breaker and the consequent strain hardening. The results of this study indicate that the failure mechanism of the motorcycle shock breaker was a functional failure due to errors in the shock breaker manufacturing process and fatigue.
Highlights
Previous research has tested shock breakers in a balanced state against a reference point, which are designed to dampen vibrations and to reduce the impact of road surfaces
Prevention of damage is expected to reduce the level of accidents and improve the safety of transportation, such that shock breakers can be used throughout the full service life of vehicle
Several tests were carried out with the aim to identify the damage to a shock breaker, including chemical composition testing, hardness testing, scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) analysis, and tensile testing
Summary
Previous research has tested shock breakers in a balanced state against a reference point, which are designed to dampen vibrations and to reduce the impact of road surfaces. It is expected that the shock breaker ensures comfort and safety when driving in a bumpy manner, and that the vibrations due to the work of the engine can be damped by. The purpose of a previous shock breaker study was to examine a 2004 Jupiter Z motorcycle having a suspension system that moves vertically, using the Matlab 6.4 software simulation [4]; in particular, considering motorcycle damper oil in comparison with viscous palm oil. The frame of the motorcycle allows for the placement of components related to the functions of efficiency, comfort, and safety while driving [5]. A very important component – in terms of the safety and comfort of the rider – is the suspension system.
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