Numerical modeling of elastoplastic deformation and damage accumulation in metals under low-cycle fatigue conditions

Volkov, I. A.; Korotkikh, Yu. G.; Tarasov, I. S.; Shishulin, D. N.

doi:10.1007/s11223-011-9317-6

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…Способы оценки надежности и качества покрытий, эксплуатируемых при постоянных нагрузках, хорошо изучены [1][2][3]. Однако в процессе эксплуатации детали с нанесенными на них покрытиями часто испытывают нагрузки переменного характера, что не может не сказываться на сроке службы изделий [4][5][6]. Исследованию усталости систем «основной металл -покрытие» посвящено достаточно много работ [7][8][9].…”

Section: Introductionunclassified

The Plant for Testing Coatings Samples Under Variable Loads

Venediktov¹,

Venediktov²

2019

Vektor nauki Tol'yattin. gos. univ.

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Section: Introductionunclassified

The Plant for Testing Coatings Samples Under Variable Loads

Venediktov¹,

Venediktov²

2019

Vektor nauki Tol'yattin. gos. univ.

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Fatigue damage evolution and finite element simulation of the samples under different notch morphology

Wang

Huang

2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Based on the theory of continuous damage mechanics and the principle of irreversible thermodynamics, the damage evolution model of low cycle fatigue is investigated. By programming the damage evolution model as UMAT subroutine in ABAQUS, the fatigue damage and crack initiation life of notch materials under specific loads are simulated, and the crack initiation location is determined. Furthermore, the effects of root radius, depth and opening angle on crack initiation life are investigated. The results show that the crack initiation occurs easily in the notch root where the damage is the most serious and the plastic strain accumulates fastest under cyclic loading. With the increase of notch depth and root radius, the crack initiation life decreases. For V-notched specimens, when the notch depth remains unchanged, the crack initiation life will decrease with the increase of the opening angle.

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Experimental and theoretical investigations of visco-plastic deformation in structural steels considering mutual influence of plasticity and creep effects

Volkov¹,

Volkov²,

Kazakov³

et al. 2014

PNRPU M.B

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This paper considers the developed mathematical model of inelastic deformation in structural steels, describing thermoviscoplastic deformation taking into account mutual influence of plasticity and creep effects. An integration algorithm for constitutive relations of thermoviscoplasticity has been developed. It consists in the formulation of constitutive relations in increments, depending on the selected time step. In difficult areas of deformation paths, time step can be adjusted throughout the whole estimation time in case of stability calculations. Stresses, plastic deformations and creep deformations are determined by integrating the defining relations of thermal creep by Runge-Kutta method with the correction of stress deviator and subsequent determination of stress according to thermal plasticity equations with regard to the average creep strain at the next sampling time. Experimental studies of influence between creep processes and plasticity under high temperature using 12H18N9 steel have been conducted. By numerical computer simulation of stress-strain state (SSS) kinetics in laboratory samples and by comparing the obtained results with field experiments, the authors carried out certification of the developed thermoviscoplastic model and integration algorithm of constitutive relations. All of these led to the conclusion about the reliability of model concepts and methods for determining material parameters under joint actions of fatigue and creep mechanisms. The authors have compared computer and physical tensile experiments of laboratory 12H18N9 steel samples with different histories of changes in temperature and mechanical deformation. It is shown that the developed thermoviscoplastic model qualitatively and quantitatively describes main effects of inelastic deformation in structural steels with different histories of mechanical deformation and changes in temperature. It is concluded that the defining relations of thermoviscoplasticity are reliable, and the above methods of integration are accurate.

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Numerical modeling of elastoplastic deformation and damage accumulation in metals under low-cycle fatigue conditions

Cited by 5 publications

References 8 publications

The Plant for Testing Coatings Samples Under Variable Loads

The Plant for Testing Coatings Samples Under Variable Loads

Fatigue damage evolution and finite element simulation of the samples under different notch morphology

Experimental and theoretical investigations of visco-plastic deformation in structural steels considering mutual influence of plasticity and creep effects

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