Viscous drag on dislocations in aluminum at high strain rates

Kumar, Avinash; Hauser, F. E.; Dorn, J.E.

doi:10.1016/0001-6160(68)90054-0

Cited by 118 publications

(37 citation statements)

References 21 publications

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“…Thus, the maximum rate level for which this constitutive description shows applicability is restricted to the appearance of the drag regime. In agreement with several authors that limiting strain rate level is estimated within the range _ e max p % 10 3 s 1 10 4 s 1 (Huang et al, 2009;Kumar et al, 1968).…”

Section: The Internal Stresssupporting

confidence: 92%

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

Rodríguez-Martínez

Rodríguez-Millán

Rusinek

et al. 2011

Mechanics of Materials

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a b s t r a c tIn this work a dislocation based constitutive description for modeling the thermo visco plastic behavior of FCC metals has been developed. The constitutive description, which is founded on the concepts of thermal activation analysis and dislocation dynamics, assumes the plastic flow additively decomposed into internal stress and effective stress. The internal stress represents the applied stress required for the transmission of plastic flow between the polycrystal grains and it is defined by the Hall Petch relationship. The effective stress formulation, which is the main innovative feature of this work, represents the thermally activated deformation behavior. This is defined taking into account the interrelationship between strain rate and temperature, and gathers structural evolution dependence. This structural evolution is described as a function of dislocations density, which acts as internal state variable in the material deformation behavior. A systematic procedure for identifica tion of the material parameters is developed and the model is applied to define the behav ior of annealed OFHC copper. The analytical predictions of the constitutive description are compared with the experimental data reported by Nemat Nasser and Li (Nemat Nasser, S., Li, Y., (1998). Flow stress of FCC polycrystals with application to OFHC Copper. Acta Mater. 46, 565 577). Good correlation between experiments and analytical predictions is found within wide ranges of strain rate and temperature.

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Section: The Internal Stresssupporting

confidence: 92%

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

Rodríguez-Martínez

Rodríguez-Millán

Rusinek

et al. 2011

Mechanics of Materials

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“…It is well established that increasing the strain rate increases the CRSS by decreasing the time for a given dislocation to overcome a barrier to its motion. At extremely high strain rates, the glide of dislocations is further inhibited by mechanisms such as phonon drag [34,35].…”

Section: (B) Plastic Deformation (I) Crystallographic Slipmentioning

confidence: 99%

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

Hazell

Appleby-Thomas

Wielewski

et al. 2014

Phil. Trans. R. Soc. A.

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Magnesium, titanium and zirconium and their alloys are extensively used in industrial and military applications where they would be subjected to extreme environments of high stress and strain-rate loading. Their hexagonal close-packed (HCP) crystal lattice structures present interesting challenges for optimizing their mechanical response under such loading conditions. In this paper, we review how these materials respond to shock loading via plate-impact experiments. We also discuss the relationship between a heterogeneous and anisotropic microstructure, typical of HCP materials, and the directional dependency of the elastic limit and, in some cases, the strength prior to failure.

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“…Several explanations of this phenomenon have been proposed over the years. Many of them are based on a transition in the rate controlling deformation mechanism from thermal activation at low strain rates to some form of dislocation drag [37,38]. Some authors also account for strain rate history effects and relate this phenomenon to the strain rate sensitivity of structure evolution (it makes the process intrinsically athermal) [26,34].…”

Section: Theoretical Considerationsmentioning

confidence: 99%

A thermo-viscoplastic constitutive model for FCC metals with application to OFHC copper

Rusinek

Rodríguez-Martínez

Árias

2010

International Journal of Mechanical Sciences

104

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Viscous drag on dislocations in aluminum at high strain rates

Cited by 118 publications

References 21 publications

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

A dislocation-based constitutive description for modeling the behavior of FCC metals within wide ranges of strain rate and temperature

The shock and spall response of three industrially important hexagonal close-packed metals: magnesium, titanium and zirconium

A thermo-viscoplastic constitutive model for FCC metals with application to OFHC copper

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