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Registration Number

0222U001959, 0120U104707 , R & D reports

Title

Construction of models and criteria of long-term fracture under creep and high-cyclic fatigue conditions considering the effect of the stress state type.

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Head

Holub Vladyslav P., Доктор технічних наук

Registration Date

04-02-2022

Organization

Institute of Mechanics. S.P. Tymoshenko of the National Academy of Sciences of Ukraine

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One-dimensional long-term fracture models of isotropic structural materials due to creep conditions have been developed. The viscous and brittle nature of the long-term fracture of prismatic rods under uniaxial tensile is considered. The viscous fracture model takes into account the change of the rod geometry during creep, the finiteness of creep deformations, the influence of the initial and current elastic components of the deformation. The condition of directing the characteristic rod size to infinity is chosen as the criterion of viscous failure. The brittle fracture model takes into account the change of the bearing capacity of the rod due to internal damage accumulation under the condition of invariance of the rod geometry. The condition of reaching the unit of the damage parameter corresponding to the reduction of the cross-sectional area of the rod to zero is chosen as a criterion for brittle fracture. The viscous and brittle fracture models have been tested experimentally on the problems of calculating the time to fracture of cylindrical specimens made of heat-resistant alloys.

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Hlemeida Serhii K.
Golub Vladyslav Petrovych
Danylchenko Svitlana Borysivna
Kaminska Olena A.
Kasperska Valentyna V.
Kobzar Yurii Mykhailovych
Maslov Borys Petrovych
Nechyporenko Olena S.
Pavliuk Yaroslav Viktorovych
Pelykh Vladymir Mykolaiovych
Plashchynska Alla Viktorivna
Pogrebnyak Anatolii Dmytrovych
Reznik Vera Serhiivna
Romanov Alexander Veniaminovych
Fernati Pavlo Viktorovych