Abstract
Cyclic tests of BLY160 low-yield-point steel were conducted in different strain ranges. Stable hysteresis loops of constant strain amplitude and multistage strain amplitude were obtained from the tests. The results show that the material exhibits obvious non-Masing characteristics; the elastic range of the hysteresis loop varies with strain amplitude, with clearly history-dependent loading. To describe the hysteresis behavior with non-Masing characteristics, a constitutive model was proposed to reduce the tensor model to a one-dimensional model. The model introduces the historical maximum strain amplitude εmax and the current strain amplitude εcur into the strengthening parameters as internal variables of the Chaboche constitutive equation to describe the non-Masing behavior. The steady-state hysteresis loops of strain obtained in simulations using this model were in good agreement with the experimental results, demonstrating the rationality and validity of the model.
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