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Numerical study of the cracking of a viscoelastic medium : analysis of the fracture test on asphalt

Hoai Nam Nguyen
Abstract : This thesis is devoted to study the phenomenon of initiation and propagation of a crack in a bituminous material. By applying an innovative test developed at LCPC (French PublicWorks Research Institute), we reproduce the conditions of initiation and propagation of a crack in a confined film of bitumen. The first part of the study introduces the approach which is used to identify the rheological properties by the generalized Maxwell model. The determination of Prony series is done by linear and non-linear optimization methods so that the complex modulus of asphalt binder could be accurately described in the frequency domain. The calibration of the viscoelastic model is then validated by comparing simulation of the three point bending test in the time domain. In the other part of the study, both viscoelasticity of the material and the kinematics of crack opening are taken into consideration in the numerical modeling of the local fracture test. The finite elements analysis exhibits the different stages of the test during the initial, final loading and the crack development process. The numerical simulation of the first traction stage of the bituminous film is 150particularly used to determine the Poisson ratio of the material. Then the analysis focuses in local fields of stress and displacement near the crack tip in the aim of evaluating the stress and opening intensity factor of the crack. The interpretation of the results clarifies the dependence of the intensity factors to the speed of loading.
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Submitted on : Wednesday, September 16, 2009 - 8:00:00 AM
Last modification on : Wednesday, September 16, 2009 - 8:00:00 AM
Long-term archiving on: : Friday, September 10, 2010 - 1:42:52 PM

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Hoai Nam Nguyen. Numerical study of the cracking of a viscoelastic medium : analysis of the fracture test on asphalt. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2008. English. ⟨pastel-00005307⟩

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