The Mechanical Threshold Stress model for various tempers of AISI 4340 steel

Banerjee, B.

doi:10.1016/j.ijsolstr.2006.05.022

Cited by 92 publications

(46 citation statements)

References 37 publications

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“…For simplicity, we use annealed OFHC copper as the material for which we evaluate all the models because this material is well-characterized. A similar exercise for various tempers of 4340 steel can be found elsewhere (Banerjee (2005a)). …”

Section: Introductionmentioning

confidence: 82%

“…A more complex model that is based on ideas from dislocation dynamics is the Mechanical Threshold Stress (MTS) model (Follansbee and Kocks (1988)). This model has been used to model the plastic deformation of copper, tantalum (Chen and Gray (1996)), alloys of steel (Goto et al (2000a); Banerjee (2005a)), and aluminum alloys (Puchi-Cabrera et al (2001)). However, the MTS model is limited to strain-rates less than around 10 7 /s.…”

Section: Flow Stress Modelsmentioning

confidence: 99%

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Effect of strain rate on microstructure of polycrystalline oxygen-free high conductivity copper severely deformed at liquid nitrogen temperature

Zhang

Shim

2010

Acta Materialia

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Phenomenological plastic flow stress models are used extensively in the simulation of large deformations of metals at high strain-rates and high temperatures. Several such models exist and it is difficult to determine the applicability of any single model to the particular problem at hand. Ideally, the models are based on the underlying (subgrid) physics and therefore do not need to be recalibrated for every regime of application. In this work we compare the Johnson-Cook, Steinberg-Cochran-Guinan-Lund, Zerilli-Armstrong, Mechanical Threshold Stress, and Preston-Tonks-Wallace plasticity models. We use OFHC copper as the comparison material because it is well characterized. First, we determine parameters for the specific heat model, the equation of state, shear modulus models, and melt temperature models. These models are evaluated and their range of applicability is identified. We then compare the flow stresses predicted by the five flow stress models with experimental data for annealed OFHC copper and quantify modeling errors. Next, Taylor impact tests are simulated, comparison metrics are identified, and the flow stress models are evaluated on the basis of these metrics. The material point method is used for these computations. We observe that the all the models are quite accurate at low temperatures and any of these models could be used in simulations. However, at high temperatures and under high-strain-rate conditions, their accuracy can vary significantly.

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Section: Introductionmentioning

confidence: 82%

Section: Flow Stress Modelsmentioning

confidence: 99%

Effect of strain rate on microstructure of polycrystalline oxygen-free high conductivity copper severely deformed at liquid nitrogen temperature

Zhang

Shim

2010

Acta Materialia

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“…This component may either be constant or may evolve with deformation. A simple model for this component can be written as [Zerilli and Armstrong 1987;Banerjee 2007]:…”

Section: The Extended Mechanical Threshold Stress Modelmentioning

confidence: 99%

“…Note that the quantity τ i for each curve is the value used to compute the Fisher plot in Figure 1, unlike the procedure used elsewhere [Goto et al 2000;Banerjee 2007]. The parameters used to compute S e (see (16)) are:…”

Section: Viscous Drag Component the Viscous Drag Component Of The Flmentioning

confidence: 99%

An extended mechanical threshold stress plasticity model: modeling 6061-T6 aluminum alloy

Banerjee

Bhawalkar²

2008

J. Mech. Mater. Struct.

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The mechanical threshold stress plasticity model of Follansbee and Kocks was designed to predict the flow stress of metals and alloys in the regime where thermally activated mechanisms are dominant and high temperature diffusion effects are negligible. In this paper we present a model that extends the original mechanical threshold stress to the high strain-rate regime (strain rates higher than 10 4 s −1 ) and attempts to allow for high temperature effects. We use a phonon drag model for moderate strain rates and an overdriven shock model for extremely high strain rates. A temperature dependent model for the evolution of dislocation density is also presented. In addition, we present a thermodynamically-based model for the evolution of temperature with plastic strain. Parameters for 6061-T6 aluminum alloy are determined and compared with experimental data. The strain-rate dependence of the flow stress of 6061-T6 aluminum is found to be in excellent agreement with experimental data. The amount of thermal softening is underestimated at high temperatures (greater than 500 K) but still is an improvement over the original model. We also find that the pressure dependence of the shear modulus does not completely explain the pressure dependence of the flow stress of 6061-T6 aluminum alloy.

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“…Elongation is in one case below tolerance. Hardness values in all failed curves compared well with the specifications of AISI 4340 for fittings [3]. The possible incidence of embrittlement effects was investigated by means of Charpy impact tests at room temperature on exservice samples.…”

Section: Compliance With Specifications and Assessment Of Materials Tomentioning

confidence: 62%

Intergranular susceptibility in failures of high pressure tubes

Otegui

Fazzini²,

Massone

et al. 2009

International Journal of Pressure Vessels and Piping

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The Mechanical Threshold Stress model for various tempers of AISI 4340 steel

Cited by 92 publications

References 37 publications

Effect of strain rate on microstructure of polycrystalline oxygen-free high conductivity copper severely deformed at liquid nitrogen temperature

Effect of strain rate on microstructure of polycrystalline oxygen-free high conductivity copper severely deformed at liquid nitrogen temperature

An extended mechanical threshold stress plasticity model: modeling 6061-T6 aluminum alloy

Intergranular susceptibility in failures of high pressure tubes

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