The mechanical threshold stress constitutive-strength model description of HY-100 steel

Goto, D.M.; GarrettJr., R. K.; Bingert, J. F.; Chen, S. R.; GrayIII, G. T.

doi:10.1007/s11661-000-0226-8

Cited by 59 publications

(47 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The MTS shear modulus model was developed by Varshni (1970) and has been used in conjunction with the Mechanical Threshold Stress (MTS) flow stress model (Chen and Gray (1996); Goto et al (2000a)). The Steinberg-Cochran-Guinan (SCG) shear modulus model was developed by Guinan and Steinberg (1974) and has been used in conjunction with the Steinberg-Cochran-Guinan-Lund (SCGL) flow stress model.…”

Section: Shear Modulusmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

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

Zhang

Shim

2010

Acta Materialia

View full text Add to dashboard Cite

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.

show abstract

Section: Shear Modulusmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…The mechanical threshold stress (MTS) flow stress model [Follansbee and Kocks 1988;Goto et al 2000;Kocks 2001] was originally developed with two assumptions:…”

Section: Introductionmentioning

confidence: 99%

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

Banerjee

Bhawalkar²

2008

J. Mech. Mater. Struct.

View full text Add to dashboard Cite

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.

show abstract

“…A temperature-dependent specific heat model [39] was used to compute the internal energy and the rate of temperature increase in the material. We assumed an initial mean porosity Three planes of symmetry are assumed, which allows modeling only 1/8th of the total geometry.…”

Section: Fast Cookoff Simulationmentioning

confidence: 99%

An Eulerian–Lagrangian approach for simulating explosions of energetic devices

Guilkey

Harman

Banerjee

2007

Computers & Structures

109

View full text Add to dashboard Cite

An approach for the simulation of explosions of "energetic devices" is described. In this context, an energetic device is a metal container filled with a high explosive (HE). Examples include bombs, mines, rocket motors or containers used in storage and transport of HE material. Explosions may occur due to detonation or deflagration of the HE material, with initiation resulting from either mechanical or thermal insult. This approach is applicable to a wide range of fluid-structure interaction scenarios, the application to energetic devices is chosen because it demonstrates the full capability of this methodology.Simulations of this type are characterized by a number of interesting and challenging behaviors. These include the transformation of the solid HE into highly pressurized gaseous products that initially occupy regions which formerly contained only solid material. This rapid pressurization of the container leads to large deformations at high strain rates and its eventual case rupture. Once the container breaks apart, the highly pressurized product gas that escapes the failing container generates shock waves that propagate through the initially quiescent surrounding fluid.The approach, which uses a finite-volume, multi-material compressible CFD formulation, within which solid materials are represented using a particle method known as the Material Point Method, is described, including certain of the sub-grid models required to close the governing equations. Results are first presented for "rate stick" and "cylinder test" scenarios, each of which involves detonating unconfined and confined HE material, respectively. Experimental data are available for these configurations and as such they serve as validation tests. Finally, results from an unvalidated "fast cook-off" simulation in which the HE is initiated by thermal input, which leads to a deflagration type of reaction, are shown.

show abstract

The mechanical threshold stress constitutive-strength model description of HY-100 steel

Cited by 59 publications

References 14 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

An Eulerian–Lagrangian approach for simulating explosions of energetic devices

Contact Info

Product

Resources

About