Comparative Study of Creep and Relaxation Characteristic of Serrate Structure Surface

Abstract

The creep and stress relaxation tests of dentate discontinuity poured by cement mortar are carried out by using biaxial creep machine under the same normal stress and shear stress levels. According to the creep and stress relaxation test results: If don't consider the instantaneous deformation of creep curve, there are many similarities of the creep curve and stress relaxation curve, but the trend of the creep curve was opposite to that of the stress relaxation curve; Creep equation and relaxation equation of Burgers model is selected to fit the creep curve and stress relaxation curve, the fitted curves agree well with the experimental data and correlation coefficient is higher. The values of G1 of the creep equation and relaxation equation are close, but the values of G2, η1 and η2 of the creep equation is one magnitude order higher compared with that of the relaxation equation, so it is not simply considered that creep and relaxation are equivalent.