Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
FAILURE ANALYSIS OF A COIL SPRING APPLIED IN THE REAR SUSPENSION OF A CITY VEHICLE
Submission Author:
Gilmar Cordeiro da Silva , MG , Brazil
Co-Authors:
Gilmar Cordeiro da Silva, Marcio Martins, Caio Silva, Felipe Bergh, Pedro Henrique Paiva, Izabela Ângela
Presenter: Gilmar Cordeiro da Silva
doi://10.26678/ABCM.COBEM2019.COB2019-0325
Abstract
Due to the presence of recurrent failures of coil springs in the rear suspension of a particular automotive vehicle model, a failure analysis was performed on one of the failed springs, in order to determine the root cause of the failure. To check if the material complied with the technical specifications of the design, chemical composition analysis, hardness tests and metallography were carried out. To reveal any possible surface defects, the spring went through the liquid penetrant test. Later, fractography was done via Scanning Electron Microscope (SEM), to identify all existent fracture mechanisms within the fracture surface. Based on the performed analyzes, it became possible to identify the root cause of the coil spring fracture, which was related to its manufacturing process. The results of this study can be used for further improvements in the design of this rear suspension spring.
Keywords
Coil Spring, Spring Steel, failure analysis, Automotive Suspension, fracture
