NDLI: Asphalt material fatigue test under cyclic loading: the lengthening of samples as a way to characterize the material damage experiments and modelling

Content Provider	Springer Nature Link
Author	Lefeuvre, Y. Roche, C. Piau, J. M.
Copyright Year	2004
Abstract	Fatigue tests of bituminous materials performed on trapezoidal specimens induce a loss of stiffness, combined with a significant extension of the specimens at the beginning of the test when applying high strain levels. This paper presents the development of a viscoelastic constitutive law with unilateral damage for asphalt materials, based on the observation of tensile failure tests on asphalt binder lenses between two metal spheres. The unilateral damage is defined as the opening of the micro-cracks in the bitumen during extension and their closing during contraction. When put into a semi-analytical structural model of the trapezoidal specimen, this constitutive law leads to results close to those highlighted at the beginning of fatigue experiments for various experimental conditions (temperature, load frequency and strain amplitude level). According to the used modelling, the damage evolution law describes the fast initial homogeneous creation of the micro-cracks and then their slow development. The modelling is also able to explain a given percentage of the loss of stiffness. These results show mainly that the bituminous material extension is due to the dissymetric behaviour induced by the unilateral damage coupled with viscoelasticity. Therefore the asphalt mix extension is a way to quantify the level of the material damage.Les essais de fatigue sur enrobés bitumineux pratiqués en flexion alternée sur éprouvettes trapézoïdales provoquent une perte de rigidité structurelle, qui s'accompagne en début d'essai d'un allongement significatif des éprouvettes. A partir de l'observation de la rupture locale d'un film mince de bitume entre deux protubérances sphériques mises en traction, on propose dans cet article une loi de comportement macroscopique des enrobés bitumineux, viscoélastique avec endommagement unilatéral. L'endommagement unilatéral se décrit de la façon suivante: les micro-fissures au sein du bitume sont ouvertes en extension et fermées en contraction. Cette loi intégrée à un modèle structurel semi-analytique rend compte des principales constatations expérimentales faites en début d'essai de fatigue pour des conditions expérimentales variées (température, fréquence et amplitude de déformation de la sollicitation). La loi d'évolution d'endommagement utilisée pour cette modélisation décrit la création rapide et homogène des microfissures, suivie d'une évolution plus lente. La modélisation peut aussi expliquer une certaine part de la perte de rigidité. Ces résultats montrent principalement que l'allongement du matériau bitumineux est dû au comportement dissymétrique induit par l'endommagement unilatéral couplé à la viscoélasticité. Par conséquent, l'extension de l'enrobé bitumineux permet de quantifier le niveau d'endommagement du matériau.
Starting Page	115
Ending Page	119
Page Count	5
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	38
Issue Number	1
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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