Characterizing the low strain complex modulus of asphalt concrete specimens through optimization of frequency response functions. Academic Article uri icon

abstract

  • Measured and finite element simulated frequency response functions are used to characterize the low strain (~10(-7)) complex moduli of an asphalt concrete specimen. The frequency response functions of the specimen are measured at different temperatures by using an instrumented hammer to apply a load and an accelerometer to measure the dynamic response. Theoretical frequency response functions are determined by modeling the specimen as a three-dimensional (3D) linear isotropic viscoelastic material in a finite element program. The complex moduli are characterized by optimizing the theoretical frequency response functions against the measured ones. The method is shown to provide a good fit between the frequency response functions, giving an estimation of the complex modulus between minimum 500 Hz and maximum 18|000 Hz depending on the temperature. Furthermore, the optimization method is shown to give a good estimation of the complex modulus master curve.

published proceedings

  • J Acoust Soc Am

author list (cited authors)

  • Gudmarsson, A., Ryden, N., & Birgisson, B.

citation count

  • 24

complete list of authors

  • Gudmarsson, Anders||Ryden, Nils||Birgisson, Bj├Ârn

publication date

  • October 2012