Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
BOUNDS FOR THE PROPAGATION MODEL OF CRACK PARIS-ERDOGAN USING THE "FAST CRACK BOUNDS" METHODOLOGY
Submission Author:
Bruno Santos , PR
Co-Authors:
Bruno Santos, Claudio Roberto Avila Silva Junior, Guilherme Menegazzo, Willian Delabenetta
Presenter: Guilherme Menegazzo
doi://10.26678/ABCM.COBEM2019.COB2019-0940
Abstract
Along the lifespan of a mechanical advice that’s exposed to variable and regular tensions, there is a big amount of fatigue causing a propagation of internal cracks in the material. There are models to figure out the propagation of these cracks and, they are, in terms of amplitude and tension, constant (CAC) and variable (CAV), taking in count that both ways are formulated with a problem of initial value (PIV), and based on the results obtained from a numerical model. This article presents the “Fast Bounds Crack” (FBC) methodology applied to the method that determines quotas functions in the “Paris-Erdogan” model. Measured by the relative deviation and computational time when compared with the Runge-Kutta method of order 4, the FBC presented maximum relative deviation of 5,92% and computational time, for the solved examples, 130000 times superior. An application to the engineering was also done to approximate numeric obtainment when the evolution law is unknown. The relative error found was 2,08%, verifying the efficiency of the “Fast Bounds Crack” method.
Keywords
Paris-Erdogan model, Fast Crack Bounds Method, linear-elastic fracture mechanics, Fatigue crack
