Vol. 16, No. 4, 2021

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Refining the thermoplasticity theory for modeling of cyclic nonisothermic loading processes

Valentin S. Bondar and Dmitry R. Abashev

Vol. 16 (2021), No. 4, 501–510

The research team carried out experimental analysis of the 12X18H10T stainless steel specimens subjected to strain-controlled cyclic loading under uniaxial tension–compression and changeable temperature. In order to describe experiment results in terms of the thermoplasticity theory (the Bondar model), which can be classified as a combined hardening flow theory, the material functions are determined by baseline experiment results under a constant temperature. The paper further formulates the fundamentals and basic equations of the thermoplasticity theory. It presents material functions to close the thermoplasticity theory for the 12X18H10T steel at varying temperatures. Then, it analyzes the modeled and experimental results of subjecting the 12X18H10T steel to strain-controlled cyclic deformation by isothermal and nonisothermal loading until the specimens break down. The subject matter of analysis is the range of in-cycle stress values as induced by nonisothermal cyclic loading. Computational and experimental results fit reliably.

nonisothermal cyclic loading, flow plasticity theory, low cycle fatigue
Received: 26 March 2020
Revised: 14 April 2021
Accepted: 23 May 2021
Published: 9 November 2021
Valentin S. Bondar
Department of Technical Mechanics
Moscow Polytechnic University
Dmitry R. Abashev
Department of Technical Mechanics
Moscow Polytechnic University