Constitutive modelling of plasticity of fcc metals under extremely high strain rates

Gao, Chong; Zhang, L.C.

doi:10.1016/j.ijplas.2011.12.001

Cited by 175 publications

(60 citation statements)

References 58 publications

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“…Both the evolutions of GNDs and SSDs were proved to contribute to the short-range effect which accordingly results in material hardening. Based on the investigations on FCC metals [25,29], the evolution of SSDs during crystallographic slip will increase the influence of shortrange obstacles that can be overcome by thermal activation. Meanwhile, GNDs contribute to this short-range effect as well.…”

Section: Constitutive Modellingmentioning

confidence: 99%

“…Gao and Zhang [25] further developed this general law in association with the effect of extreme strain rate and proposed a unified constitutive model for thermal stress as follows:…”

Section: Constitutive Modellingmentioning

confidence: 99%

“…Jiang et al [24] developed a flow stress-grain size relationship based on the dislocation pile-up theory and Ashby's model. Gao and Zhang [25] developed a constitutive model of plasticity of face-centred cubic (FCC) metals in which the flow stress was subdivided into athermal and thermal components based on dislocation theory. This study expressed a new constitutive relationship for FCC metals by combining the influences of grain size and forming temperature.…”

Section: Introductionmentioning

confidence: 99%

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Influences of temperature and grain size on the material deformability in microforming process

Jiang

Zhao

et al. 2016

Int J Mater Form

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This paper investigated the influences of temperature and grain size on the deformability of pure copper in micro compression process. Based on the dislocation theory, a constitutive model was proposed taking into account the influences of forming temperature, Hall-Petch relationship and surface layer model. Vacuum heat treatment was employed to obtain various grain sizes of cylindrical workpieces, and then laser heating method was applied to heat workpieces during microforming process. Finite element (FE) simulation was also performed, with simulated values agreed well with the experimental results in terms of metal flow stress. Both the FE simulated and experimental results indicate that forming temperature and grain size have a significant influence on the accuracy of the produced product shape and metal flow behaviour in microforming due to the inhomogeneity within the deformed material. The mechanical behaviour of the material is found to be more sensitive to forming temperature when the workpieces are constituted of fine grains. experimental results indicate that forming temperature and grain size have a significant influence on the accuracy of the produced product shape and metal flow behaviour in microforming due to the inhomogeneity within the deformed material. The mechanical behaviour of the material is found to be more sensitive to forming temperature when the workpieces are constituted of fine grains.

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Section: Constitutive Modellingmentioning

confidence: 99%

“…Gao and Zhang [25] further developed this general law in association with the effect of extreme strain rate and proposed a unified constitutive model for thermal stress as follows:…”

Section: Constitutive Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influences of temperature and grain size on the material deformability in microforming process

Jiang

Zhao

et al. 2016

Int J Mater Form

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“…Such dislocation density based models, also classified as multiscale models, used information at the dislocation level to quantify the deformation at the grain/continuum level and formed the basis of the formulation of hardening laws of crystal plasticity framework. This has been pursued by many authors in the past [4][5][6]. Alankar et al [4] developed a dislocation density based crystal plasticity model taking into account the interactions between dislocations and kinematics of crystal deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Alankar et al [4] developed a dislocation density based crystal plasticity model taking into account the interactions between dislocations and kinematics of crystal deformation. Gao et al [5] presented a crystal plasticity model that uses the mobile dislocation density for calculation of plastic strain and microstructure evolution in the material. The mobile dislocation density is a function of total density of mobile and immobile dislocations in the material.…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling of plasticity in a copper single crystal deformed at high strain rates

Chandra

Samal

Chavan

et al. 2015

Plasticity and Mechanics of Defects

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A hierarchical multiscale modeling approach is presented to predict the mechanical response of dynamically deformed (1100 s −1 −4500 s −1 ) copper single crystal in two different crystallographic orientations. An attempt has been made to bridge the gap between nano-, micro-and meso-scales. In view of this, Molecular Dynamics (MD) simulations at nanoscale are performed to quantify the drag coefficient for dislocations which has been exploited in Dislocation Dynamics (DD) regime at the microscale. Discrete dislocation dynamics simulations are then performed to calculate the hardening parameters required by the physics based Crystal Plasticity (CP) model at the mesoscale. The crystal plasticity model employed is based on thermally activated theory for plastic flow. Crystal plasticity simulations are performed to quantify the mechanical response of the copper single crystal in terms of stressstrain curves and shape changes under dynamic loading. The deformation response obtained from CP simulations is in good agreement with the experimental data.

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Physical Based Constitutive Model for the Prediction of Plastic Deformation of Fe‐Cr‐Ni Stainless Steel Under High Strain Rate

Yu¹,

Wang²,

Ye³

2015

TMS2015 Supplemental Proceedings

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Constitutive modelling of plasticity of fcc metals under extremely high strain rates

Cited by 175 publications

References 58 publications

Influences of temperature and grain size on the material deformability in microforming process

Influences of temperature and grain size on the material deformability in microforming process

Multiscale modeling of plasticity in a copper single crystal deformed at high strain rates

Physical Based Constitutive Model for the Prediction of Plastic Deformation of Fe‐Cr‐Ni Stainless Steel Under High Strain Rate

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