Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Effects of crack tunneling on the elastic unloading compliance of SE(B) specimens - current limitations and proposals.
Submission Author:
Gustavo Henrique Bolognesi Donato , SP
Co-Authors:
Leonardo Giangiulio Ferreira Andrade, Gustavo Henrique Bolognesi Donato
Presenter: Leonardo Giangiulio Ferreira Andrade
doi://10.26678/ABCM.COBEM2017.COB17-2130
Abstract
This paper investigates the effects of crack tunneling on the elastic unloading compliance of SE(B) 1T fracture specimens. Numeric simulations were conducted with three levels of crack depth and five levels of crack curvature. Results show that for the same equivalent straight crack proposed by the ASTM E1820, the elastic compliance decreases with the increase of the crack front curvature, showing that the predicted crack size in real experiments would be smaller than the equivalent straight crack proposed by the ASTM. No significant deviations were detected within ASTM limits (ASTM, 2013a), which guarantees accurate crack size estimations if standardized requirements are met. When those limits are surpassed, on the other hand, significant deviations were found, and a new proposal for determining the equivalent straight crack in such situations was developed. The deviations provided by the new proposal were very reduced and tend to lead to a better understanding regarding the test of SE(B) specimens containing curved cracks.
Keywords
Fracture Mechanics, Elastic unloading compliance, SE(B), Crack tunneling
