Evaluation of a phenomenological elastic‐plastic approach for magnesium alloys under multiaxial loading conditions

Magnesium alloys are greatly appreciated due to their high strength to weight ratio, stiffness, and low density; however, they can exhibit complex types of cyclic plasticity like twinning, de‐twinning, or Bauschinger effect. Recent studies indicate that these types of cyclic plastic deformations can...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2019-11, Vol.42 (11), p.2468-2486
Main Authors: Anes, Vitor, Reis, Luís, Freitas, Manuel
Format: Article
Language:English
Subjects:
Alloy steels
Aluminum base alloys
AZ31B‐F
Bauschinger effect
cyclic plasticity
Deformation effects
Elastic deformation
experimental tests
Functions (mathematics)
magnesium alloy
Magnesium alloys
Magnesium base alloys
Mechanical properties
multiaxial loading paths
Plastic properties
Polynomials
Stiffness
Strength to weight ratio
Twinning
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Summary:Magnesium alloys are greatly appreciated due to their high strength to weight ratio, stiffness, and low density; however, they can exhibit complex types of cyclic plasticity like twinning, de‐twinning, or Bauschinger effect. Recent studies indicate that these types of cyclic plastic deformations cannot be fully characterized using the typical tools used in cyclic characterization of steels and aluminium alloys; thus, it is required new approaches to fully capture their cyclic deformation and plasticity. This study aims to propose and evaluate a phenomenological cyclic elastic‐plastic approach designed to capture the cyclic deformation of magnesium alloys under multiaxial loading conditions. Series of experimental tests were performed to characterize the cyclic mechanical behaviour of the magnesium alloy AZ31BF considering proportional loadings with different strain amplitude ratios and a nonproportional loading with a 45° phase shift. The experimental results were modulated using polynomial functions in order to implement a cyclic plasticity model for the AZ311BF based on the phenomenological approach proposed. Results show good correlations between experiments and estimates.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13025