Boris Andreevich Stratula (Institute for Computer Aided Design of the Russian Academy of Sciences) :


539.3 Mathematical modeling of fatigue failure during high-frequency bending vibrations of titanium alloy specimens

Stratula B. A. (Institute for Computer Aided Design of the Russian Academy of Sciences)

doi: 10.18698/2309-3684-2021-4-4557

A unified numerical method for different fatigue fracture modes from low-cycle to very-high-cycle fatigue is described on the basis of a multi-mode two-criterion model of cyclic damage. This method allows for a through calculation of the evolution of crack-like fatigue fracture zones in a material, as well as an assessment of the durability of specimens from crack nucleation to macrofracture. Fatigue fracture calculations of titanium alloy specimens under prolonged cyclic loading under three-point bending scheme with development of "quasi-cracks" in modes from multi-cycle to super-multi-cycle fatigue have been carried out. Numerical and experimental results are compared to each other.

Стратула Б.А. Математическое моделирование усталостного разрушения при высокочастотных изгибных колебаниях образцов из титановых сплавов. Математическое моделирование и численные методы, 2021, № 4, с. 45–57.

539.3 Modeling of cyclic damage and fatigue strength under high frequency loading of 3D printed aluminum alloy specimens

Nikitin A. D. (Institute for Computer Aided Design of the Russian Academy of Sciences), Stratula B. A. (Institute for Computer Aided Design of the Russian Academy of Sciences)

doi: 10.18698/2309-3684-2024-1-1837

A comparative analysis of the fatigue strength of hot-rolled and SLM materials was performed based on data from high-frequency cyclic tests for corset specimens made of aluminum alloy D16T and SLM alloy AlSi10Mg on piezoelectric equipment. The relatively low cyclic strength of SLM materials is shown, which is associated with their complex microstructure and is influenced by the laser scanning strategy, laser beam parameters, energy, heat transfer from the melting zone, and environmental parameters in the chamber. Mathematical modeling of the process of fatigue failure of the specified specimens was carried out for various amplitudes and mean stresses in the cycle using a multi-mode model of cyclic damage and a numerical method for calculating the kinetics of damage under high-frequency cyclic loading. The proposed model and calculation method make it possible to quickly and efficiently fatigue curves constructing for various cyclic loading modes and cycle asymmetry coefficients. It is enough to know the base points of the bi-modal fatigue curve for the reverse cycle to implement this computational procedure.

Никитин А.Д., Стратула Б.А. Моделирование циклической повреждаемости и усталостной прочности при высокочастотном нагружении 3Д-напечатанных образцов из алюминиевого сплава. Математическое моделирование и численные методы, 2024, № 1, с. 18–37.