Determination of the Creep Parameters of Linear Viscoelastic Materials

Creep process of linear viscoelastic materials is described by the integral equation of boltzmann-volterra in which creep kernel is approximated by rabotnov's fractional exponential function. the creep equation contains four unknown parameters: α,singularity parameter; β,fading parameter;,rheological parameter; and ϵ 0,conditionally instantaneous strain. two-stage determination method of creep parameters is offered. at the first stage,taking into account weak singularity properties of abel's function at the initial moment of loading,parameters ϵ 0 and α are determined. at the second stage,using already known parameters ϵ 0 and α,parameters β and are determined. analytical expressions for calculating these parameters are obtained. an accuracy evaluation of the offered method with using experimentally determined creep strains of material nylon 6 and asphalt concrete showed its high accuracy. © 2016 alibay iskakbayev et al.