Description of Creep and Fracture of Modern Construction Materials using Kinetic Equations in Energy Form
B. V. Gorev1, I. V. Lyubashevskaya1, V. A. Panamarev2, S. V. Iyavoynen3
1Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2Siberian State Industrial University, Novokuznetsk, 654007 Russia
3Novosibirsk State University, Novosibirsk, 630090 Russia
Keywords: kinetic theory of creep, fracture, scalar damage parameter, equivalent stresses, normalized specific energy dissipation
Abstract
It has been shown experimentally and theoretically that the equations of the Rabotnov kinetic theory of creep with a scalar damage parameter can be used to describe the deformation (up to fracture) of metallic materials in creep without restrictions on the creep strain and energy dissipation at the moment of fracture. In finding the functional dependences in the equations of creep and damage, the damage parameter is determined by the amount of normalized specific energy dissipation in the process of material creep under the necessary condition of similarity of the initial creep curves for constant stresses and temperatures in the normalized variables.
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