On the Behavior of a Parallel Elasto-Visco-Plastic Model for Asphaltic Materials

• The paper considers a dissipation energy based elasto-visco-plastic constitutive modelformulated by coupling in parallel visco-elastic and elasto-plastic components, which has been developed at Delft University of Technology for the response prediction ofasphaltic materials. To discuss the various aspects of the model under different creep loads, a simplified one-dimensional analytical solution is derived. Three different analytical cases are treated: visco-elastic response, elasto-visco-plastic response in which plasticity develops during the loading and instantaneous plasticity. The analyses show that the interaction between the parallel visco-elastic and elasto-plasticcomponents of the model are an important aspect of the predictive capabilities of themodel. A case is derived in which short duration loading of the model could lead to aprediction of increasing strains during the unloading phase. Care should be taken when choosing the material parameters of the model to avoid this erroneous prediction. 

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Infrastrukturteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Infrastructure Engineering (hsv//eng)

Nyckelord

Creep

Elasto-visco-plasticity

Energy based models

Finite elements

Frozen energy release

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