Modelling of dynamic damage and failure in aluminium alloys

Date

2012-11-30T00:00:00Z

Supervisor/s

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier Science B.V., Amsterdam.

Department

Type

Article

ISSN

0734-743X

Format

Free to read from

Citation

R. Vignjevic, N. Djordjevic, J. Campbell, V. Panov. Modelling of dynamic damage and failure in aluminium alloys. International Journal of Impact Engineering, Volume 49, November 2012, pp61-76.

Abstract

A physically based damage and failure model, applicable to orthotropic metals is proposed in this paper. To account for the physical mechanisms of failure, the concept of thermally activated damage initially proposed by Klepaczko [1], has been adopted as the basis for the model. This assumption makes the proposed damage/failure model compatible with the Mechanical Threshold Strength (MTS) model [2-6], which was used within the overall constitutive model to describe material behaviour in the plastic regime. A shock equation of state [7] was coupled with the rest of the constitutive model to allow for modelling of shock wave propagation in the material. The new model was implemented in DYNA3D [8] and coupled with our in-house non-linear transient SPH code, MCM (Meshless Continuum Mechanics). Parameters for the new constitutive model, i.e. parameters for the plasticity model and the damage model, were derived on the basis of the uniaxial tensile tests and Taylor anvil tests. The subject of investigation is a polycrystalline aluminium alloy AA7010, whose orthotropy is a consequence of meso-scale phase distribution, or grain morphology. Tensile tests were performed for the range of temperatures between and , and strain rates between and . In order to validate the new damage model, a numerical simulation of Taylor anvil tests has been performed for AA7010, using a single stage gas gun at velocity of . The numerical analysis clearly demonstrates the ability of this new model to predict experimentally observed damage and failure.

Description

Software Description

Software Language

Github

Keywords

Damage, Aluminium alloys, Strain rate, Finite elements

DOI

Rights

This is the author’s version of a work that was accepted for publication in International Journal of Impact Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Impact Engineering, Volume 49, November 2012, pp61-76. DOI:10.1016/j.ijimpeng.2012.03.009

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