Experimental investigation and constitutive modelling of creep-damage behaviours in monzogranite

Abstract

In this study, the creep-damage behaviour of monzogranite is first investigated through triaxial creep tests under different confining pressures. Creep deformation and its rate in the whole creep process are compared and analysed on the basis of the experimental results. It is seen that the rate of creep strains is closely related to applied stress and can be described by an exponential function in terms of deviatoric stress. A discrete viscoplastic damage constitutive model is then formulated in the discrete thermodynamic framework and with micro-mechanical consideration. Comparisons between experimental data and numerical prediction show that the model can well describe the typical phenomena of creep behaviour.

Keywords:

• viscoplastic damage model
• creep
• discrete thermodynamics
• monzogranite

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was financially supported by the National Programme on Key Basic Research Project (973 Program) [grant number 2011CB013504]; the National Natural Science Foundation of China [grant number 51209075], [grant number 11202063]; National Key Technology Research and Development Programme of the Ministry of Science and Technology of China [grant number 2013BAB06B01]; and the Fundamental Research Funds for the Central Universities [grant number 2015B06014].