Papers by Keyword: Eshelby

Abstract: Asphalt mixture was simply treated as a two-phase composite, in which coarse aggregates are embedded into asphalt mastic matrix. According to the elastic-viscoelastic correspondence principle, an elastic micromechanical method is extended for predicting viscoelastic properties of asphalt mixture, which is simply treated as elastic coarse aggregate inclusions periodically and isotropically embedded into viscoelastic asphalt mastic matrix. The Burgers model is adopted for characterizing the matrix mechanical behavior, so that the homogenized relaxation modulus of asphalt mixture in compression creep is derived. After a series of uniaxial compression creep tests are performed on asphalt mastic in different stress conditions in order to determine the matrix constitutive parameters, the presented framework is validated by comparison with the experiment, and then some predictions to uniaxial compression creep behavior of asphalt mixture in different stress conditions are given.

Abstract: Composite structures offer lighter weight and higher strength and stiffness than most metal materials. The composite structures are increasingly applied in areas such as automotive and aerospace engineering among others. From the different types of composite materials, elliptical inclusions particulates provide an opportunity to control the stiffness and damping as a function of the ratio of the larger to shorter axis, orientation and size. In this paper we present a first evaluation of the effect of elliptical inclusions in the vibration modes of a beam single supported. Here, we can see that for inclusions with the major axis oriented parallel to the axis of the beam, the maximum stresses tend to be higher, while the frequencies and offsets remain similar.