SUDEEP SAHOO - Academia.edu (original) (raw)

Papers by SUDEEP SAHOO

Research paper thumbnail of Nano-Structuring of a High Entropy Alloy by Severe Plastic Deformation: Experiments and Crystal Plasticity Simulations

Research paper thumbnail of Analysis of the energy balance of plastically deformed polycrystals in viscoplastic self-consistent modelling

European Journal of Mechanics - A/Solids

Research paper thumbnail of An analytical model to predict strain-hardening behaviour and twin volume fraction in a profoundly twinning magnesium alloy

International Journal of Plasticity, 2019

An analytical model is presented that can successfully predict the strain hardening behaviour as ... more An analytical model is presented that can successfully predict the strain hardening behaviour as well as the variations in twin volume fraction in polycrystalline Magnesium alloy Mg-3Al-0.3Mn that twins profoundly during deformation. The model is composed of three basic elements: (i) Twin fraction prediction, based on crystal plasticity elements, (ii) a two-phase composite model composed of the matrix and the twins by adopting the "Iso-work" hypothesis, (iii) a strain hardening approach inspired from a crystal plasticity model. The experiments include uniaxial compression tests for two different cases at ambient temperature. The microstructures were characterized at various strains up to fracture using the Electron Back-Scattered Diffraction technique in a FEG-SEM. The microstructural investigation revealed the formation of a lamellar structure of alternated layers of matrix and { } 1012 1011-extension twin domains. With progressive deformation, the twins broadened and consumed the entire microstructure prior to fracture. The model could accurately reproduce the experimental twin-induced sigmoidal shaped flow curve together with the twin volume fraction evolution.

Research paper thumbnail of Strain hardening, twinning and texture evolution in magnesium alloy using the all twin variant polycrystal modelling approach

International Journal of Plasticity, 2020

In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling... more In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling was employed to decipher the deformation behaviour of Mg-3Al-0.3Mn Magnesium alloy that develops f1012g1011-extension twins profoundly during ambient temperature compression. Twinning was considered by taking into account all the potential f1012g twin variants, and hence called here as the 'ATV' approach. The model treats each twin variant as a grain with increasing volume fraction transferred from the respective parent grain according to its pseudoslip shear-rate. The slip and twin-induced strain hardening were simulated by adopting a classical phenomenological hardening model while assigning a higher hardening coefficient for the twins relative to the parent matrix. The viscoplastic self-consistent polycrystal homogenisation scheme combined with the ATV approach permitted to reproduce with high precision the experimentally measured strain hardening behaviour, crystallographic texture and twin volume fraction evolution. Beyond these average measures, the activities of twin variants in individual grains could be predicted in good agreement with Electron Back-Scattered Diffraction measurements. The ATV approach permits also to examine the matrix and twin phases separately in terms of textures and misorientation distributions.

Research paper thumbnail of Microstructure, Texture Evolution and Dynamic Recrystallization in Magnesium

Research paper thumbnail of A new macroscopic strain hardening function based on microscale crystal plasticity and its application in polycrystal modeling

A new phenomenological strain hardening function is proposed to describe the strain hardening beh... more A new phenomenological strain hardening function is proposed to describe the strain hardening behavior of metallic materials. The function is based on a simplification of an earlier established self and latent hardening crystal plasticity approach. The proposed function contains only four parameters, which can be readily obtained using an efficient numerical technique by fitting the experimental curve. Several applications on different materials are presented and good agreements with the experimental counterparts were obtained. One great advantage of the proposed empirical function is that its parameters can be directly used in polycrystal viscoplastic modeling (VPSC approach) for crystal plasticity-based incremental strain hardening simulations. For the conversion of the parameters between the macroscopic scale and the grain-level, the Taylor factor was used, which was re-defined for polycrystals in the present work. The VPSC simulations also led to good reproduction of the experimental strain hardening behavior for all investigated cases, with rapid convergence.

Research paper thumbnail of Plastic energy-based analytical approach to predict the mechanical response of two-phase materials with application to dual-phase steels

European Journal of Mechanics - A/Solids

A composite made of two phases is considered with a perfect disorder of the phases, and isotropic... more A composite made of two phases is considered with a perfect disorder of the phases, and isotropic behavior. The strain hardening behavior of such a composite is modeled under axisymmetric tension. The approach is based on using the strain hardening behavior of the two constituent phases together with a relation between the plastic energy of the two phases. The newly developed analytical model was applied to several dual-phase steel alloys and on iron-silver composite metal. These case studies revealed that the equal-power approach reproduces faithfully the strain hardening behavior of the composite, together with the strain partitioning between the two phases, in good agreement with experiments.

Research paper thumbnail of Strain hardening, twinning and texture evolution in magnesium alloy using the all twin variant polycrystal modelling approach

In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling... more In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling was employed to decipher the deformation behaviour of Mg-3Al-0.3Mn Magnesium alloy that develops f1012g1011-extension twins profoundly during ambient temperature compression. Twinning was considered by taking into account all the potential f1012g twin variants, and hence called here as the 'ATV' approach. The model treats each twin variant as a grain with increasing volume fraction transferred from the respective parent grain according to its pseudo-slip shear-rate. The slip and twin-induced strain hardening were simulated by adopting a classical phenomenological hardening model while assigning a higher hardening coefficient for the twins relative to the parent matrix. The viscoplastic self-consistent polycrystal homogenisation scheme combined with the ATV approach permitted to reproduce with high precision the experimentally measured strain hardening behaviour, crystallographic texture and twin volume fraction evolution. Beyond these average measures, the activities of twin variants in individual grains could be predicted in good agreement with Electron Back-Scattered Diffraction measurements. The ATV approach permits also to examine the matrix and twin phases separately in terms of textures and misorientation distributions.

Research paper thumbnail of Nano-Structuring of a High Entropy Alloy by Severe Plastic Deformation: Experiments and Crystal Plasticity Simulations

Research paper thumbnail of Analysis of the energy balance of plastically deformed polycrystals in viscoplastic self-consistent modelling

European Journal of Mechanics - A/Solids

Research paper thumbnail of An analytical model to predict strain-hardening behaviour and twin volume fraction in a profoundly twinning magnesium alloy

International Journal of Plasticity, 2019

An analytical model is presented that can successfully predict the strain hardening behaviour as ... more An analytical model is presented that can successfully predict the strain hardening behaviour as well as the variations in twin volume fraction in polycrystalline Magnesium alloy Mg-3Al-0.3Mn that twins profoundly during deformation. The model is composed of three basic elements: (i) Twin fraction prediction, based on crystal plasticity elements, (ii) a two-phase composite model composed of the matrix and the twins by adopting the "Iso-work" hypothesis, (iii) a strain hardening approach inspired from a crystal plasticity model. The experiments include uniaxial compression tests for two different cases at ambient temperature. The microstructures were characterized at various strains up to fracture using the Electron Back-Scattered Diffraction technique in a FEG-SEM. The microstructural investigation revealed the formation of a lamellar structure of alternated layers of matrix and { } 1012 1011-extension twin domains. With progressive deformation, the twins broadened and consumed the entire microstructure prior to fracture. The model could accurately reproduce the experimental twin-induced sigmoidal shaped flow curve together with the twin volume fraction evolution.

Research paper thumbnail of Strain hardening, twinning and texture evolution in magnesium alloy using the all twin variant polycrystal modelling approach

International Journal of Plasticity, 2020

In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling... more In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling was employed to decipher the deformation behaviour of Mg-3Al-0.3Mn Magnesium alloy that develops f1012g1011-extension twins profoundly during ambient temperature compression. Twinning was considered by taking into account all the potential f1012g twin variants, and hence called here as the 'ATV' approach. The model treats each twin variant as a grain with increasing volume fraction transferred from the respective parent grain according to its pseudoslip shear-rate. The slip and twin-induced strain hardening were simulated by adopting a classical phenomenological hardening model while assigning a higher hardening coefficient for the twins relative to the parent matrix. The viscoplastic self-consistent polycrystal homogenisation scheme combined with the ATV approach permitted to reproduce with high precision the experimentally measured strain hardening behaviour, crystallographic texture and twin volume fraction evolution. Beyond these average measures, the activities of twin variants in individual grains could be predicted in good agreement with Electron Back-Scattered Diffraction measurements. The ATV approach permits also to examine the matrix and twin phases separately in terms of textures and misorientation distributions.

Research paper thumbnail of Microstructure, Texture Evolution and Dynamic Recrystallization in Magnesium

Research paper thumbnail of A new macroscopic strain hardening function based on microscale crystal plasticity and its application in polycrystal modeling

A new phenomenological strain hardening function is proposed to describe the strain hardening beh... more A new phenomenological strain hardening function is proposed to describe the strain hardening behavior of metallic materials. The function is based on a simplification of an earlier established self and latent hardening crystal plasticity approach. The proposed function contains only four parameters, which can be readily obtained using an efficient numerical technique by fitting the experimental curve. Several applications on different materials are presented and good agreements with the experimental counterparts were obtained. One great advantage of the proposed empirical function is that its parameters can be directly used in polycrystal viscoplastic modeling (VPSC approach) for crystal plasticity-based incremental strain hardening simulations. For the conversion of the parameters between the macroscopic scale and the grain-level, the Taylor factor was used, which was re-defined for polycrystals in the present work. The VPSC simulations also led to good reproduction of the experimental strain hardening behavior for all investigated cases, with rapid convergence.

Research paper thumbnail of Plastic energy-based analytical approach to predict the mechanical response of two-phase materials with application to dual-phase steels

European Journal of Mechanics - A/Solids

A composite made of two phases is considered with a perfect disorder of the phases, and isotropic... more A composite made of two phases is considered with a perfect disorder of the phases, and isotropic behavior. The strain hardening behavior of such a composite is modeled under axisymmetric tension. The approach is based on using the strain hardening behavior of the two constituent phases together with a relation between the plastic energy of the two phases. The newly developed analytical model was applied to several dual-phase steel alloys and on iron-silver composite metal. These case studies revealed that the equal-power approach reproduces faithfully the strain hardening behavior of the composite, together with the strain partitioning between the two phases, in good agreement with experiments.

Research paper thumbnail of Strain hardening, twinning and texture evolution in magnesium alloy using the all twin variant polycrystal modelling approach

In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling... more In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling was employed to decipher the deformation behaviour of Mg-3Al-0.3Mn Magnesium alloy that develops f1012g1011-extension twins profoundly during ambient temperature compression. Twinning was considered by taking into account all the potential f1012g twin variants, and hence called here as the 'ATV' approach. The model treats each twin variant as a grain with increasing volume fraction transferred from the respective parent grain according to its pseudo-slip shear-rate. The slip and twin-induced strain hardening were simulated by adopting a classical phenomenological hardening model while assigning a higher hardening coefficient for the twins relative to the parent matrix. The viscoplastic self-consistent polycrystal homogenisation scheme combined with the ATV approach permitted to reproduce with high precision the experimentally measured strain hardening behaviour, crystallographic texture and twin volume fraction evolution. Beyond these average measures, the activities of twin variants in individual grains could be predicted in good agreement with Electron Back-Scattered Diffraction measurements. The ATV approach permits also to examine the matrix and twin phases separately in terms of textures and misorientation distributions.