Thermodynamics-based finite strain viscoelastic-viscoplastic model coupled with damage for asphalt material
(English)Article in journal (Other academic) Submitted
A thermodynamics based thermo-viscoelastic-viscoplastic model coupled with damage using the finite strain frameworksuitable for asphalt material is proposed in this paper. A detailed procedure for model calibration and validationis presented, utilizing a set of experimental measurements such as creep-recovery, constant creep, and repeated creeprecoverytests under dierent loading conditions. The calibrated constitutive model is able to predict the sophisticatedtime- and temperature- dependent responses of asphalt material, both in tension and in compression. Moreover, a scenariocase study on permanent deformation (rutting) prediction of a practical asphalt pavement structure is presentedin this work. This paper presents the main features of this new constitutive model for asphalt: 1) A thermodynamicsbasedframework developed in the large strain context to derive the specific viscoelastic, viscoplastic and damageconstitutive equations; 2) A viscoelastic dissipation potential involving deviatoric and volumetric parts, in whichProny series representations of the Lam´e constants are used; 3) A modified Perzyna’s type viscoplastic formulationwith non-associated flow rule adopted to simulate the inelastic deformation, using a Drucker-Prager type plastic dissipationpotential; 4) A specific damage model developed for capturing the evolution disparity between tension andcompression. As such, the developed model presents a robust, fully coupled and validated constitutive framework thatincludes the major behavioral components of asphalt materials, enabling thus an optimized simulation of predictedperformance under various conditions. Further development improvements to the model in continued research eortscan be to include further environmental and physico-chemical material behavior such as ageing, healing or moistureinduced damage.
Viscoelasticity, Viscoplasticity, Damage, Thermodynamics, Asphalt material
Research subject Civil and Architectural Engineering
IdentifiersURN: urn:nbn:se:kth:diva-195593OAI: oai:DiVA.org:kth-195593DiVA: diva2:1044547
QCR 201611072016-11-032016-11-032016-11-11Bibliographically approved