Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Analysis of Mixed-mode Stress Intensity Factors using Digital Image Correlation Displacement Fields
Submission Author:
Jorge Guillermo Díaz Rodríguez , SS
Co-Authors:
Jorge Guillermo Díaz Rodríguez, Giancarlo Gonzales, Julian Andres Ortiz Gonzalez , José Luiz de França Freire
Presenter: Jorge Guillermo Díaz Rodríguez
doi://10.26678/ABCM.COBEM2017.COB17-0684
Abstract
This paper presents two experimental approaches for determining the mode I and mode II stress intensity factors (SIFs) of a crack initiated and propagated by cyclic loading. The first measures the crack opening displacement (COD) and then evaluates SIFs from the first term of the Westergaard displacement function by using the least-squares method. The second determines coefficients of generalized Westergaard function from the full-field displacement data around the crack by an over-deterministic linear Least Square scheme. From the estimated coefficients, the SIF values can be determined. Both approaches use the displacement field measured by the Digital Image Correlation (DIC) technique. The fatigue test was performed on a modified compact tension C(T) specimen made out of low carbon steel, in which a hole was machined to curve the crack propagation path, inducing the I/II mixed mode.
Keywords
Digital Image Correlation (DIC), Crack propagation, mixed mode fracture, LEFM
