CYCLIC PLASTIC PROPERTIES OF CLASS C STEEL EMPHASIZING ON RATCHETING: TESTING AND MODELLING
Journal Title: Strojnicky casopis - Journal of Mechanical Engineering - Year 2015, Vol 65, Issue 1
Abstract
Cyclic plasticity modelling of metals needs individual approach. There are specific theories for various metallic materials including mainly phenomenological models, useful for practical applications [1]. However, a robust cyclic plasticity model with higher number of parameters, which should be estimated using a large amount of experimental fatigue test data, is often required for correct description of material behaviour. It is true mainly for case of stress controlled loading with non-zero mean stress value, when cyclic creep or so called ratcheting occurs. The ratcheting effect can be described as an accumulation of any component of strain tensor with increasing number of cycles. It was recognized [2 – 3], that cyclic plasticity models recently included in common commercial FE programs (namely overlay Besseling model [4] and Armstrong-Frederick type model of Chaboche [5]) cannot correctly describe ratcheting under uniaxial and non-proportional multiaxial loading simultaneously and cannot capture non-proportional hardening, non-Masing’s behavior and other important effects of cyclic plasticity. The problem can be solved by implementing a more complex cyclic plasticity model into a FE code, see publications [6] and [7]. This paper is focused on the stress-strain behaviour of the Class C steel in cyclic plastic domain and its FE simulation. An experimental study on the wheel steel specimens including uniaxial as well as multiaxial tests has been realized in the laboratory at Department of mechanics of materials of VŠB-TU Ostrava. The MAKOC model applied in simulations gives very good prediction of ratcheting in all solved cases.
Authors and Affiliations
R. Halama, A. Markopoulos, M. Šofer, Z. Poruba and P. Matušek
Keywords
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