Modified Johnson–Cook material flow model for hot deformation processing

Maheshwari, Amit Kumar; Pathak, K. K.; Ramakrishnan, N.; Narayan, Seema

doi:10.1007/s10853-009-4010-x

Cited by 45 publications

(19 citation statements)

References 7 publications

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“…Finally, the average value of the estimated slope of the linear plot is used to determine Q by substituting R and previously calculated n values in the Eq. (16).…”

Section: Versus 1000=tmentioning

confidence: 99%

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Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

et al. 2015

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Hot flow behavior of hot isostatically processed experimental nickel-based superalloy is investigated over temperature and strain rate ranging from 1000-1200°C and 0.001-1 s -1 , respectively by carrying out constant true strain rate isothermal compression tests up to true strain of 0.69. True stress-true strain curves corrected for adiabatic temperature rise exhibited rapid strain hardening followed by flow softening behavior irrespective of temperature and strain rate regimes investigated, although anomalous flow behavior is observed at 1200°C. Variation of peak flow stress with temperature is corroborated to the microstructural changes pertaining to the morphology and relative volume fraction of the phases present. From the experimental results, constitutive model incorporating the effects of strain rate, strain, and temperature is established to describe the hot flow behavior of investigated alloy. Dependence of peak flow stress on strain rate and temperature described by Zener-Hollomon (Z) parameter indicated increase in peak flow stress with Z. Additionally Cingara-Queen equation is employed to predict flow curve up to peak stress. The reliability of developed constitutive models is validated statistically and the results indicate reasonable agreement with experimental findings.

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“…Finally, the average value of the estimated slope of the linear plot is used to determine Q by substituting R and previously calculated n values in the Eq. (16).…”

Section: Versus 1000=tmentioning

confidence: 99%

“…Therefore, formulating the appropriate constitutive model to predict the deformation behavior at elevated temperature is a huge challenge. Numerous models based on empirical, semiempirical, and physically based models have been proposed and details of these models are found available in recent review paper [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

et al. 2015

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“…In order to improve the accuracy of original Johnson Cook model, the strain, strain rate harden and thermal soften terms of Johnson Cook model had been modified [3][4][5][6][7][8][9][10][11]. The thermally activated and viscous regimes were considered in the modified Johnson Cook model [3].…”

Section: Introductionmentioning

confidence: 99%

“…While no modified temperature term of Johnson Cook model was pointed out in this publication. According to high temperature experiment data of Al-2024 aluminum alloy, a modified temperature term of Johnson Cook model was proposed [8]. And a modified Johnson Cook model was proposed to consider the strain rate term [9].…”

Section: Introductionmentioning

confidence: 99%

The modified temperature term on Johnson Cook model for AZ31 magnesium alloy

Zhang

Liu

Mao

et al. 2018

Materialwissenschaft Werkst

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The quasi‐state and dynamic mechanism of AZ31 magnesium alloy at a strain rates range of 0.001 s‐1–2500 s‐1 under a temperature range of 20 °C–250 °C were researched by compression tests using the electronic universal testing machine and split Hopkinson pressure bar system. The true stress‐strain curves at different strain rates and evaluated temperatures were obtained. The result shows that the thermal soften effect of AZ31 magnesium alloy is significant. By modifying the temperature term of the original Johnson Cook model of AZ31 magnesium alloy, a modified Johnson Cook model of AZ31 magnesium alloy has been proposed to reveal thermal soften effect on the deformation behavior of AZ31 magnesium alloy more precisely. With the modified Johnson Cook model and fracture model, the finite element method simulation of AZ31 magnesium alloy hat shaped specimen under impacting was conducted. The numerical simulation result is consistent with the experimental result, which indicates that the modified Johnson Cook model and fracture model are greatly valid to predict the deformation and fracture behavior of the AZ31 magnesium alloy hat shaped specimen under impacting.

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“…The flow stress study of alloy plays a significant role in determining hot working parameters that influence the microstructure and mechanical behaviors of workpieces [21,22]. Generally, proper constitutive equations can accurately describe the non-linear relation among true stress, strain, strain rate and deformation temperature.…”

Section: Introductionmentioning

confidence: 99%