Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/29653
Title: Modelling and Characterisation of Orthotropic Damage in Aluminium Alloy 2024
Authors: Djordjevic, N
Sundararajah, R
Vignjevic, R
Campbell, J
Hughes, K
Keywords: damage characterisation;quasistatic loading;elastic–plastic constitutive model with damage;finite element model;VUMAT user material subroutine
Issue Date: 29-Aug-2024
Publisher: MDPI
Citation: Djordjevic, N. et al. (2024) 'Modelling and Characterisation of Orthotropic Damage in Aluminium Alloy 2024', Materials, 17 (17), 4281, pp. 1 - 15. doi: 10.3390/ma17174281.
Abstract: The aim of the work presented in this paper was development of a thermodynamically consistent constitutive model for orthotopic metals and determination of its parameters based on standard characterisation methods used in the aerospace industry. The model was derived with additive decomposition of the strain tensor and consisted of an elastic part, derived from Helmholtz free energy, Hill’s thermodynamic potential, which controls evolution of plastic deformation, and damage orthotopic potential, which controls evolution of damage in material. Damage effects were incorporated using the continuum damage mechanics approach, with the effective stress and energy equivalence principle. Material characterisation and derivation of model parameters was conducted with standard specimens with a uniform cross-section, although a number of tests with non-uniform cross-sections were also conducted here. The tests were designed to assess the extent of damage in material over a range of plastic deformation values, where displacement was measured locally using digital image correlation. The new model was implemented as a user material subroutine in Abaqus and verified and validated against the experimental results for aerospace-grade aluminium alloy 2024-T3. Verification was conducted in a series of single element tests, designed to separately validate elasticity, plasticity and damage-related parts of the model. Validation at this stage of the development was based on comparison of the numerical results with experimental data obtained in the quasistatic characterisation tests, which illustrated the ability of the modelling approach to predict experimentally observed behaviour. A validated user material subroutine allows for efficient simulation-led design improvements of aluminium components, such as stiffened panels and the other thin-wall structures used in the aerospace industry.
Description: Data Availability Statement: The data presented in this study are available on request from the corresponding author.
URI: https://bura.brunel.ac.uk/handle/2438/29653
DOI: https://doi.org/10.3390/ma17174281
Other Identifiers: ORCiD: Nenad Djordjevic https://orcid.org/0000-0002-2729-5721
ORCiD: Rade Vignjevic Rade.Vignjevic@brunel.ac.uk
ORCiD: James Campbell https://orcid.org/0000-0001-8208-8103
ORCiD: Kevin Hughes https://orcid.org/0000-0002-8522-7903
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Appears in Collections:Dept of Mechanical and Aerospace Engineering Research Papers

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