Numerical simulations of adiabatic shear localization in textured FCC metal based on crystal plasticity finite element method

Experimental investigations of adiabatic shear localization in the nanostructured face-centered-cubic (FCC) alloys have revealed that micro-texture has a key role in advancing the formation of adiabatic shear bands (ASBs) (see reference [35]). In this work, we present the crystal plasticity finite e...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-11, Vol.737, p.348-363
Hauptverfasser: Li, Jianguo, Li, Yulong, Suo, Tao, Wei, Qiuming
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description Experimental investigations of adiabatic shear localization in the nanostructured face-centered-cubic (FCC) alloys have revealed that micro-texture has a key role in advancing the formation of adiabatic shear bands (ASBs) (see reference [35]). In this work, we present the crystal plasticity finite element simulations (CPFEM) of dynamic uniaxial compression and simple shear in polycrystalline models with different initial textures. The aim is to study the effects of typical textures, which are often observed in FCC metals after severe plastic deformation or recrystallization, on the formation of ASBs under high strain rate loading. The materials response is described by an elastic-viscoplastic continuum slip constitutive relation, in which the dependence of slip systems’ resistance on the temperature evolution is also considered. Simulation results show that, under high-rate compression, except for some textures which are not favorable for the formation of ASBs, different textures lead to various orientation of shear bands and different critical strains at which the shear localizations occur. High-rate simple shear loading is found to facilitate ASB formation. Even in the texture-free, namely Random texture, model obvious shear localization was observed. However, the dependence of slip system activation on texture leads to considerable variation in the critical shear strain level for ASB initiation. Additionally, the effects of some factors, such as strain rate, temperature rise and strength of materials, on the formation of ASBs in FCC textured metals are discussed to interpret the formation process in more depth. We also combined the experimental observations and numerical simulations to elaborate the reason why ASBs have rarely been reported in FCC materials.
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In this work, we present the crystal plasticity finite element simulations (CPFEM) of dynamic uniaxial compression and simple shear in polycrystalline models with different initial textures. The aim is to study the effects of typical textures, which are often observed in FCC metals after severe plastic deformation or recrystallization, on the formation of ASBs under high strain rate loading. The materials response is described by an elastic-viscoplastic continuum slip constitutive relation, in which the dependence of slip systems’ resistance on the temperature evolution is also considered. Simulation results show that, under high-rate compression, except for some textures which are not favorable for the formation of ASBs, different textures lead to various orientation of shear bands and different critical strains at which the shear localizations occur. High-rate simple shear loading is found to facilitate ASB formation. Even in the texture-free, namely Random texture, model obvious shear localization was observed. However, the dependence of slip system activation on texture leads to considerable variation in the critical shear strain level for ASB initiation. Additionally, the effects of some factors, such as strain rate, temperature rise and strength of materials, on the formation of ASBs in FCC textured metals are discussed to interpret the formation process in more depth. 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The materials response is described by an elastic-viscoplastic continuum slip constitutive relation, in which the dependence of slip systems’ resistance on the temperature evolution is also considered. Simulation results show that, under high-rate compression, except for some textures which are not favorable for the formation of ASBs, different textures lead to various orientation of shear bands and different critical strains at which the shear localizations occur. High-rate simple shear loading is found to facilitate ASB formation. Even in the texture-free, namely Random texture, model obvious shear localization was observed. However, the dependence of slip system activation on texture leads to considerable variation in the critical shear strain level for ASB initiation. Additionally, the effects of some factors, such as strain rate, temperature rise and strength of materials, on the formation of ASBs in FCC textured metals are discussed to interpret the formation process in more depth. We also combined the experimental observations and numerical simulations to elaborate the reason why ASBs have rarely been reported in FCC materials.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2018.08.105</doi><tpages>16</tpages></addata></record>
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subjects Adiabatic flow
Adiabatic shear band
Computer simulation
Constitutive relationships
Crystal plasticity
Cube texture
Dependence
Edge dislocations
Face centered cubic lattice
FCC metals
Finite element analysis
Finite element method
High strain rate
Mathematical analysis
Mathematical models
Mechanical properties
Microtexture
Nanostructured materials
Plastic deformation
Plastic properties
Polycrystals
Recrystallization
Shear bands
Shear localization
Shear strain
Simulation
Slip
Slip resistance
Strain rate
Texture effect
title Numerical simulations of adiabatic shear localization in textured FCC metal based on crystal plasticity finite element method
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