The ratcheting and strain cyclic characteristics of U71Mn rail steel were experimentally researched under uniaxial and non-proportionally multiaxial cyclic loading at room temperature. The effects of cyclic strain, stress and their histories on strain cyclic characteristics and ratcheting were studied, respectively. It is shown that: U71Mn rail steel exhibits a cyclic stabilization and non-memorization for previous loading history under strain cycling; however, the ratcheting of the material depends greatly not only on the current values of mean stress and stress amplitude, but also on their histories; the non-proportionality of multiaxial loading path only causes a negligible additional hardening for the material. Based on the Ohno-Wang non-linear kinematic hardening model (Int. J. Plast. 9 (1993) 375, 391), the uniaxial and multiaxial ratcheting behaviours of the material were simulated by a visco-plastic constitutive model. The simulated results are in good consistence with the experimental ones.
Uniaxial and non-proportionally multiaxial ratcheting of U71Mn rail steel: Experiments and simulations
Mechanics of Materials ; 34 , 12 ; 809-820
2002
12 Seiten, 28 Quellen
Article (Journal)
English
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