scholarly journals Description of Texture and Yield Locus Evolution Under Different Deformation Paths of Copper Sheet

1995 ◽  
Vol 23 (4) ◽  
pp. 237-248
Author(s):  
N. Mingolo ◽  
C. Vial-Edwards
Keyword(s):  
Texture Evolution ◽  
Rate Sensitivity ◽  
Yield Locus ◽  
Slip Systems ◽  
Copper Sheet ◽  
Deformation Path ◽  
Loading Paths ◽  
Self Consistent ◽  
Consistent Approach ◽  
Active Slip

The evolution of texture with plastic deformation along different loading paths has been studied for a commercial DHP copper sheet metal. Two models have been utilized to predict the evolution of textures: Viscoplastic under Relaxed Constraints conditions (VRC) and a Self Consistent approach (SC) with viscoplastic conditions, where the {111}<110> active slip systems were selected according to a strain rate sensitivity law.The stress-strain curves along different loading paths were calculated taking into account the texture evolution predicted by VRC and SC models. Predictions with the SC formulation were very close to experimental results. Texture evolution depended on the deformation path.

scholarly journals Evolution of Texture and Yield Locus of AISI 409 Ferritic Stainless Steel

1993 ◽  
Vol 21 (4) ◽  
pp. 207-217 ◽  
Author(s):  
N. Mingolo ◽  
A. Pochettino ◽  
C. Vial-Edwards
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Strain Rate ◽  
Strain Hardening ◽  
Ferritic Stainless Steel ◽  
Texture Evolution ◽  
Rate Sensitivity ◽  
Yield Locus ◽  
Slip Systems ◽  
Hardening Process

The evolution of texture and yield locus of AISI 409 ferritic stainless steel under different deformation paths was analyzed.Texture evolution with plastic deformation was predicted by two models: Taylor (TPG), assuming pencil glide in {hkl}〈111〉 slip systems and Viscoplastic under the relaxed constraint assumption (VRC), considering the following slip systems: {110}〈111〉, {112}〈111〉, and {123}〈111〉, selected according to a strain rate sensitivity law. TPG model tends to predict some stronger developments of texture than the VRC model.Predictions of stress–strain curves along different loading paths with TPG and VRC models were very close to experimental results. Texture evolution did not have a significant effect to modify the rate and the isotropy of the strain hardening process of AISI 409 ferritic stainless steel.

scholarly journals Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling

2021 ◽  
Vol 8 ◽  
Author(s):  
Tomas Manik ◽  
Knut Marthinsen ◽  
Kai Zhang ◽  
Arash Imani Aria ◽  
Bjørn Holmedal
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Crystal Plasticity ◽  
Texture Evolution ◽  
Rate Sensitivity ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Electron Back Scatter Diffraction ◽  
Slip Systems ◽  
Flat Profile

In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity simulations and compared to experimentally measured textures obtained by electron back-scatter diffraction (EBSD). The AA6063 alloy was extruded at a relatively low temperature (350°C), while the AA6082 alloy, containing dispersoids that prevent recrystallization, was extruded at a higher temperature (500°C). Both alloys were water quenched at the exit of the die, to maintain the deformation texture after extrusion. In the center of the profiles, both alloys exhibit a conventional β-fiber texture and the Cube component, which was significantly stronger at the highest extrusion temperature. The classical full-constraint (FC)-Taylor and the Alamel grain cluster model were employed for the texture predictions. Both models were implemented using the regularized single crystal yield surface. This approach enables activation of any number and type of slip systems, as well as accounting for strain rate sensitivity, which are important at 350°C and 500°C. The strength of the nonoctahedral slips and the strain-rate sensitivity were varied by a global optimization algorithm. At 350°C, a good fit could be obtained both with the FC Taylor and the Alamel model, although the Alamel model clearly performs the best. However, even with rate sensitivity and nonoctahedral slip systems invoked, none of the models are capable of predicting the strong Cube component observed experimentally at 500°C.

Improving the Self-Consistent Predictions of Texture Development of Polycrystals Incorporating Intragranular Field Fluctuations

2005 ◽  
Vol 495-497 ◽  
pp. 955-964 ◽  
Author(s):  
Ricardo A. Lebensohn ◽  
Carlos Tomé ◽  
Pedro Ponte Castañeda
Keyword(s):  
Basal Slip ◽  
Texture Evolution ◽  
Rate Sensitivity ◽  
Second Order ◽  
Homogenization Procedure ◽  
Compression Direction ◽  
Self Consistent ◽  
Field Fluctuations ◽  
Standard Linear ◽  
Derivatives Of

In this contribution we present how to implement the calculation of average field fluctuations inside the grains of a thermoelastic aggregate in terms of the derivatives of the stress potential given by the standard linear self-consistent (SC) model, and how this statistical information can be used to generate second-order estimates for the mechanical behavior of nonlinear viscoplastic polycrystals, by means of a rigorous non-linear homogenization procedure. To illustrate the differences between this second-order (SO) self-consistent approach and the classical first-order SC approximations, we compare them in terms of their predictions of the effective behavior of random fcc polycrystals as a function of their rate-sensitivity, and of the texture evolution in hcp ice polycrystals under uniaxial compression. In the latter case, the SO approximation is the only one able to predict a substantial accommodation of deformation by basal slip, even when the basal poles become strongly aligned with the compression direction and the basal slip systems became unfavorably oriented.

scholarly journals Unlocking Deformation Path in Asymmetric Rolling by Texture Simulation

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 101
Author(s):  
Satyaveer Singh Dhinwal ◽  
Laszlo S Toth
Keyword(s):  
Plastic Deformation ◽  
Simple Shear ◽  
Texture Evolution ◽  
Asymmetric Rolling ◽  
Deformation Path ◽  
Shear Process ◽  
Self Consistent ◽  
Rolling Plain ◽  
Plain Strain ◽  
Main Components

The texture evolution is wearing the signature of the deformation path in plastic deformation. In asymmetric rolling, plain strain compression and shear are the main components of the imposed strain. In this work, viscoplastic self-consistent (VPSC) simulations of the texture evolution were used to determine the combination and sequence of the two deformation components. It has been found that the deformation path is composed of two parts in asymmetric rolling: it is first essentially rolling, followed by the simple shear process. Simultaneous rolling and shear process cannot produce the observed textures, while the decomposed simulation can reproduce it faithfully.

Erratum to: On a self-consistent approach to a bose model near the criticality

1981 ◽  
Vol 32 (2) ◽  
pp. 39-44 ◽  
Author(s):  
L. S. Campana ◽  
M. D’Ambrosio ◽  
L. De Cesaee
Keyword(s):  
Self Consistent ◽  
Consistent Approach
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