Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
NUMERICAL ANALYSIS OF TENSION AND STABILITY IN COMPRESSION HELICOID SPRINGS BY THE FINITE ELEMENT METHOD
Submission Author:
Pierre Breno Nunes de Assis , CE , Brazil
Co-Authors:
Pierre Breno Nunes de Assis, Beatriz da Costa Lima, Laura Fernanda Pereira da Silva, Claudecir Fernandes de Freitas Moura Júnior, Ramon Rudá Brito Medeiros
Presenter: Pierre Breno Nunes de Assis
doi://10.26678/ABCM.COBEM2021.COB2021-1581
Abstract
Helical compression springs are mechanical elements designed to accumulate potential elastic energy during their compression, in which the absorbed energy is dissipated or used for the movement of other mechanisms. When loaded, they undergo shear and torsional shear stresses. Due to the curvature of the turns, the stresses in the internal regions are amplified. Analogous to columns, helical compression springs can fail by buckling. Thus, the objective of this work is to determine, through the finite element method, the factor that correlates the effects of direct shear and stress concentration due to the curvature of the turns and to perform stability analyses related to the buckling of the wire springs circular and square sections. Static linear analysis is applied to determine the factor that correlates the effects of direct shear and stress concentration. The linear buckling analyses (eigenvalue and eigenvector modeling) was applied in the stability analyzes. The simulations were performed on the ANSYS ACADEMIC 2021® platform. Studies with different approaches have already been carried out in order to determine the factor that relates the effects of direct shear and stress concentration due to the curvature of the turns. The existing buckling stability studies deal only with springs with circular wire. For both sections, the stress analyses performed showed a high stress amplification factor for low spring rates. For higher spring rates, the factor decreased. The analyses of the buckling for circular and square section, with a free end for rotation on the axis perpendicular to the longitudinal, showed susceptibility to unstable behavior for greater reasons of free length / turns diameter. Both sections, with the two ends embedded, showed values susceptible to failure by buckling for a ratio between 7 and 10. The results were compared with other studies, in order to understand how the numerical analyses behave in relation to the existing results It is worth mentioning that the results obtained in the buckling analyses for the square section spring are considerably close to the existing results for the circular section spring, demonstrating that it is feasible to use the existing results, regardless of the section.
Keywords
Helical Compression Spring, stress concentration, shear, Buckling, Finite Element Method
