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Network evolution
model of anisotropic stress softening in filled rubber-like
materials: Parameter identification and finite element
implementation
Roozbeh Dargazany, Vu Ngoc Khiêm, Uwe Navrath and Mikhail Itskov |
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Vol. 7 (2012), No. 8-9, 861–885
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Abstract |
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A purely micromechanical network evolution theory granting new insight into the damage mechanism was proposed previously by the authors (Dargazany and Itskov, 2009). In this follow-up paper, we further formulate the network evolution model for implementation into finite element simulations. To this end, a general internal variable formulation is developed which determines the inelastic response of the microstructure on the basis of the free energy function. The thermodynamical consistency of the network evolution model is then verified analytically. Next, the predictive capabilities of the model are demonstrated by means of several experiments especially designed to capture stress softening, permanent set, and induced anisotropy. Finally, the influence of the filler concentration on material parameters is studied. |
Keywords
Mullins effect, stress softening, constitutive behavior,
microstructures, anisotropic material, rubber material
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Milestones
Received: 12 June 2012
Revised: 10 October 2012
Accepted: 16 October 2012
Published: 23 January 2013
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Authors |
| Roozbeh Dargazany | |
| Department of Materials Science and
Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Room 12002 Cambridge, MA 02139 United States |
Department of Continuum
Mechanics RWTH Aachen University Kackertstraße 9 52072 Aachen Germany |
| Vu Ngoc Khiêm | |
| Department of Continuum
Mechanics RWTH Aachen University Kackertstraße 9 52072 Aachen Germany |
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| Uwe Navrath | |
| Department of Continuum
Mechanics RWTH Aachen University Kackertstraße 9 52072 Aachen Germany |
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| Mikhail Itskov | |
| Department of Continuum
Mechanics RWTH Aachen University Kackertstraße 9 52072 Aachen Germany |
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