Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Numerical/experimental analysis of the crack trajectory in mixed-mode loading
Submission Author:
ANDRÉ LUIS RODRIGUES ARAÚJO , DF
Co-Authors:
JORGE FERREIRA, ANDRÉ LUIS RODRIGUES ARAÚJO
Presenter: ANDRÉ LUIS RODRIGUES ARAÚJO
doi://10.26678/ABCM.COBEM2017.COB17-0621
Abstract
It is important to be able to predict the fatigue life of mechanical components with the objective of avoiding premature exchange of such components. However, this is not trivial when the component is subject to mixed-mode loading. The presence of stress intensity KI and KII cause changes in the direction of crack propagation. This work proposes a routine for predicting the crack trajectory in a finite element software (Ansys APDL), where the slope of the crack is calculated by the MCS (Maximum circumferential stress) model. The da/dN x ΔK curves of the 7050-T7451 aluminum alloy were experimentally obtained for various lamination directions in the fatigue laboratory of the UnB, based on these results the numerical simulations were performed. The methodology is validated with experimental results obtained through fatigue tests on modified compact tension CT specimens, in which holes were machined to curve the crack propagation path. The method used shows excellent results for the CT with the direction of lamination S-L, but for the directions T-L and T-S did not obtain good predictions.
Keywords
fatigue crack growth, Finite Elements, Maximum circumferential stress
