, Volume 54, Issue 1–2, pp 19–31 | Cite as

The frequency response function of the creep compliance

  • Nicos MakrisEmail author


Motivated from the need to convert time-dependent rheometry data into complex frequency response functions, this paper studies the frequency response function of the creep compliance that is coined the complex creep function. While for any physically realizable viscoelastic model the Fourier transform of the creep compliance diverges in the classical sense, the paper shows that the complex creep function, in spite of exhibiting strong singularities, it can be constructed with the calculus of generalized functions. The mathematical expressions of the real and imaginary parts of the Fourier transform of the creep compliance of simple rheological networks derived in this paper are shown to be Hilbert pairs; therefore, returning back in the time domain a causal creep compliance. The paper proceeds by showing how a measured creep compliance of any solid-like or fluid-like viscoelastic material can be decomposed into elementary functions with parameters that can be identified from best fit of experimental data. The proposed technique allows for a direct determination of the sufficient parameters needed to approximate an experimentally measured creep compliance and the presented mathematical formulae offers dependable expressions of the corresponding complex-frequency response functions.


Basic response functions Causality Rheological measurements Viscoelasticity Hilbert transform 



The assistance of Dr. Mehrdad Aghagholizadeh with the management of the electronic document is appreciated.

Compliance with ethical standards

Conflict of interest

The author declares that he has no conflict of interest.


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© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringSouthern Methodist UniversityDallasUSA
  2. 2.Department of Civil EngineeringUniversity of PatrasRioGreece
  3. 3.Office of Theoretical and Applied MechanicsAcademy of AthensAthensGreece

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