Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
INCERTEZA DE MEDIÇÃO NO ENSAIO DE FADIGA PARA DIFERENTES RUGOSIDADES SUPERFICIAIS
Submission Author:
Lisiane Trevisan , RS
Co-Authors:
Daniel Antonio Kapper Fabricio
Presenter: Lisiane Trevisan
doi://10.26678/ABCM.COBEF2017.COF2017-0077
Abstract
Industrial processes may be controlled by a series of mechanical tests, and testing reliability depends on the measurement uncertainty values. Fatigue testing is one of the most important tests in the mechanical field, because it describes material behavior when subjected to dynamic efforts. Material behavior depends on surface roughness, because it modifies supported tension when material is subjected to dynamic forces. The main goal of this article is to determine the expanded uncertainty of the SAE 316L stainless steel when submitted to the fatigue test for both the number of cycles and the ‘adjusted stress’ due to the influence of surface finish. The measurement uncertainty were obtained for three different levels of stress (480 MPa, 500 MPa and 520 MPa) in three different surface finishes (Ru1, Ru2 and Ru3). Each level of roughness is represented by a different surface finish experimentally determined by a profilometer and mathematically represented by varying Rz. Using the Monte Carlo method it was possible to determine the expanded uncertainty of the ‘adjusted stress’. The extended uncertainty of the number of cycles was calculated based on the dispersion of the results the number of cycles supported by each specimen. The measurement uncertainty of results for the ‘adjusted stress’ show with acceptable values within the given criterion by ASTM E466.
Keywords
Ensaio de Fadiga, incerteza de medição, Método de Monte Carlo
