Ratcheting behavior of class C wheel steel and its prediction by modified AbdelKarim-Ohno model

Kód výsledku v IS VaVaI

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RIV/61989100:27230/15:86098996

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Ratcheting behavior of class C wheel steel and its prediction by modified AbdelKarim-Ohno model

Popis výsledku v původním jazyce

Wear of materials in rail/wheel industry is closely related to the ratcheting phenomenon. The paper presents main results of the experimental research on ratcheting behavior under uniaxial as well as non-proportional loading conducted on the Class C wheel steel. Fatigue failures of all specimens were rather caused by low-cycle fatigue mechanism than by the ratcheting. McDowell's extrapolation was successfully applied to the calculation of twist and shear strain accumulation. A new cyclic plasticity model suitable for the ratcheting behavior prediction was developed within this study. The plasticity model based on the AbdelKarim-Ohno kinematic hardening and Calloch isotropic hardening rules was extended by a memory surface concept of Jiang-Sehitoglu. The model was used to describe the influence of stress amplitude on ratcheting rate of the investigated material. In addition, the advantage of the model is the possibility to calculate the steady ratcheting rate which can be subsequently used for extrapolation of the cycle by cycle accumulated quantity.

Název v anglickém jazyce

Ratcheting behavior of class C wheel steel and its prediction by modified AbdelKarim-Ohno model

Popis výsledku anglicky

Wear of materials in rail/wheel industry is closely related to the ratcheting phenomenon. The paper presents main results of the experimental research on ratcheting behavior under uniaxial as well as non-proportional loading conducted on the Class C wheel steel. Fatigue failures of all specimens were rather caused by low-cycle fatigue mechanism than by the ratcheting. McDowell's extrapolation was successfully applied to the calculation of twist and shear strain accumulation. A new cyclic plasticity model suitable for the ratcheting behavior prediction was developed within this study. The plasticity model based on the AbdelKarim-Ohno kinematic hardening and Calloch isotropic hardening rules was extended by a memory surface concept of Jiang-Sehitoglu. The model was used to describe the influence of stress amplitude on ratcheting rate of the investigated material. In addition, the advantage of the model is the possibility to calculate the steady ratcheting rate which can be subsequently used for extrapolation of the cycle by cycle accumulated quantity.

Druh

O - Ostatní výsledky

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů