On a damage law for creep rupture of clays with accumulated inelastic deviatoric strain as a damage measure. (July 2017) - Jiang, Jianhong
Highlights: A damage law for creep rupture is proposed without dependency on origin of time. A reasonable agreement between model simulations and test data was obtained. The upper yield strength for creep of clays is explained in a new way. A form for the characteristic strain of creep rupture is suggested and discussed. Abstract: To avoid the dependency on origin of time, an improved damage law for creep rupture of clays is proposed considering the accumulated inelastic deviatoric strain as a measure of damage, instead of incorporating time directly. This law is incorporated into an existing anisotropic elastoplastic-viscoplastic bounding surface model for clays. The performance of the damage law was demonstrated via the simulations of creep rupture tests on undisturbed clays, and generally a good agreement between model simulations and test data was obtained. Discussions on the creep rupture parameters were followed and further improvement was suggested. At present when high quality test data for creep rupture is very limited, the proposed damage law could serve as a practical way to model creep rupture of clays.