| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1558770 | Procedia Structural Integrity | 2016 | 8 Pages |
The evaluation of the behaviour of the magnesium alloy AZ31B under biaxial fatigue and short crack conditions of a specimen is presented. Test specimens present a notch, done by a drilling device, to promote the initiation of the crack in this localized region. The loading path consists on axial and torsional loadings which are in-phase and out-of-phase with each other. The crack growth rate of the specimen, under the stress intensity factor range was evaluated. Furthermore, the critical plane models, that are used to evaluate the specimen without a notch, revealed to be in this case, satisfactory to predict the angle of fracture of the specimen with a notch. The strains close to the notch were determined numerically using Finite Element Analysis. For this purpose, two finite element models were built to reproduce the proportional and non-proportional loading path. Beside this, were conducted tests with a Scanning Electron Microscope (SEM) to see the morphology of the fracture surface, in the proportional loading, which presents radial marks that are not present on the non proportional loading. The loading path shows a significant influence on the behaviour of the magnesium alloy AZ31B as well as in the life of the specimen. It is also presented a methodology to calculate the life of the specimen with a notch under biaxial load path, proportional and non proportional. Satisfactory results were achieved.
