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.
