Deshpande, VS and Fleck, NA (2000) Isotropic constitutive models for metallic foams. Journal of the Mechanics and Physics of Solids, 48. pp. 1253-1283. ISSN 0022-5096Full text not available from this repository.
The yield behaviour of two aluminum alloy foams (Alporas and Duocel) has been investigated for a range of axisymmetric compressive stress states. The initial yield surface has been measured, and the evolution of the yield surface has been explored for uniaxial and hydrostatic stress paths. It is found that the hydrostatic yield strength is of similar magnitude to the uniaxial yield strength. The yield surfaces are of quadratic shape in the stress space of mean stress versus effective stress, and evolve without corner formation. Two phenomenological isotropic constitutive models for the plastic behaviour are proposed. The first is based on a geometrically self-similar yield surface while the second is more complex and allows for a change in shape of the yield surface due to differential hardening along the hydrostatic and deviatoric axes. Good agreement is observed between the experimentally measured stress versus strain responses and the predictions of the models.
|Divisions:||Div C > Materials Engineering|
|Depositing User:||Cron Job|
|Date Deposited:||18 May 2016 18:07|
|Last Modified:||31 Aug 2016 02:47|