MODELING OF NON-STATIONARY CREEP PROCESSES UNDER MULTIPLE LOADING CONDITIONS BY TAKING INTO ACCOUNT DAMAGE ACCUMULATION IN A STRUCTURAL MATERIAL

The article considers the problem on assessing the kinetics of the stress-strain state and the process of damage accumulation in polycrystalline structural materials of units and assemblies of engineering objects, the operational impacts of which are characterized by a highly loaded state under the influence of non-stationary long-term thermal force loading, where the main degradation mechanism is material creep. A mathematical model is presented. It is based on the concepts of the mechanics of a damaged medium and makes it possible to describe processes during unsteady creep under complex loading conditions and the main hypotheses underlying the mathematical model. By comparing the results of a numerical simulation with experimental data, a proof of the applicability of the mathematical model for uniaxial and multiaxial sign-variable loading conditions is given.

Automated summary

The article addresses the issue of assessing the kinetics of stress-strain state and damage accumulation in polycrystalline structural materials under highly loaded conditions caused by non-stationary long-term thermal force loading. It presents a mathematical model based on the mechanics of a damaged medium and provides proof of its applicability for different loading conditions through numerical simulations and comparison with experimental data.