Deformation behaviour of TWIP steels: Constitutive modelling informed by local and integral experimental methods used in concert

2021 ◽  
pp. 111667
Author(s):  
S. Martin ◽  
A. Weidner ◽  
C. Ullrich ◽  
C. Schimpf ◽  
M. Motylenko ◽  
...  
Keyword(s):  
Deformation Behaviour ◽  
Experimental Methods ◽  
Constitutive Modelling ◽  
Twip Steels

Experimental investigation and constitutive modelling of the deformation behaviour of high impact polystyrene for plug-assisted thermoforming

2020 ◽  
Vol 21 (6) ◽  
pp. 607
Author(s):  
Oualid Atmani ◽  
Fazilay Abbès ◽  
Yuming Li ◽  
Serge Batkam ◽  
Boussad Abbès
Keyword(s):  
Numerical Study ◽  
Deformation Behaviour ◽  
Thermomechanical Properties ◽  
Constitutive Modelling ◽  
High Impact ◽  
The Real ◽  
High Impact Polystyrene ◽  
Different Temperatures ◽  
Thermoforming Process ◽  
Abaqus Software

This paper concerns the experimental and numerical study of the plug-assisted thermoforming process of high impact polystyrene (HIPS). The thermomechanical properties of this polymer were characterized at different temperatures and deformation rates. To study the influence of different parameters in the real conditions of plug-assisted thermoforming process, we carried out “plug-only” tests at different temperatures and plug velocities. To model the deformation behaviour of HIPS, we proposed a thermo-elastic-viscoplastic model, which we have implemented in Abaqus software. A thermo-dependent friction model was also proposed and implemented in Abaqus software. The parameters of the proposed models were identified by the inverse analysis method in the real conditions of plug-assisted thermoforming. The proposed models were validated with “plug-only” tests and plug-assisted thermoforming of yogurt container.

Deformation Mechanisms in High-Al Bearing High-Mn TWIP Steels in Hot Compression and in Tension at Low Temperatures

2007 ◽  
Vol 550 ◽  
pp. 217-222 ◽  
Author(s):  
Atef S. Hamada ◽  
L. Pentti Karjalainen ◽  
Mahesh C. Somani ◽  
R.M. Ramadan
Keyword(s):  
Austenitic Steel ◽  
Work Hardening ◽  
Hot Deformation ◽  
Low Temperatures ◽  
Deformation Behaviour ◽  
Tensile Tests ◽  
Mechanical Twinning ◽  
Al Content ◽  
Duplex Steel ◽  
Twip Steels

The hot deformation behaviour of two high-Mn (23-24 wt-%) TWIP steels containing 6 and 8 wt-% Al with the fully austenitic and duplex microstructures, respectively, has been investigated at temperatures of 900-1100°C. In addition, tensile properties were determined over the temperature range from -80 to 100°C. It was observed that in spite of the lower Al content, the austenitic steel possessed the hot deformation resistance about twice as high as that of the duplex steel. Whereas the flow stress curves of the austenitic steel exhibited work hardening followed by slight softening due to dynamic recrystallisation, the duplex steel showed the absence of work hardening and discontinuous yielding under similar conditions. Tensile tests at low temperatures revealed that the austenitic grade had a lower yield strength than that of the duplex grade, but much better ductility, the elongation increasing with decreasing temperature, contrary to that for the duplex steel. This can be attributed to the intense mechanical twinning in the austenitic steel, while in the duplex steel, twinning occurred in the ferrite only and the austenite showed dislocation glide.

Constitutive Modelling of Hot Deformation Behaviour of Nitrogen Alloyed Martensitic Stainless Steel

2020 ◽  
Vol 5 (4) ◽  
pp. 769-777
Author(s):  
S. Chenna Krishna ◽  
S. Anoop ◽  
N. T. B. N. Koundinya ◽  
N. K. Karthick ◽  
Pravin Muneshwar ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Hot Deformation ◽  
Martensitic Stainless Steel ◽  
Deformation Behaviour ◽  
Constitutive Modelling ◽  
Hot Deformation Behaviour

Statistical aspects of microplasticity: experiments, discrete dislocation simulations and stochastic continuum models

2013 ◽  
Vol 22 (3-4) ◽  
pp. 89-100 ◽  
Author(s):  
Michael Zaiser
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Deformation Behaviour ◽  
Computational Modelling ◽  
Constitutive Models ◽  
Constitutive Modelling ◽  
Flow Process ◽  
Discrete Dislocation ◽  
Deformation Properties ◽  
Deformation Processes

AbstractThe plastic deformation properties of microscale and nanoscale specimens differ from those of their macroscopic counterparts as the discrete nature of the elementary processes governing plastic flow becomes directly visible. In such specimens, details of the initial defect microstructure may exert a strong influence on the recorded deformation behaviour, which accordingly exhibits significant scatter even amongst specimens that share an identical preparation history. The plasticity of microsamples appears as a sequence of spatially and temporally localised events and not as the smooth and continuous flow process envisaged by classical continuum elastoplasticity. These observations pose a significant challenge to constitutive modelling. In this feature article, we discuss the statistics of fluctuations in microscale and nanoscale plasticity and discuss the implications for computational modelling of plastic deformation processes on microscale and nanoscales. We propose a new type of constitutive models that combine a classical continuum description of the elastic problem with a stochastic description of the dynamics of plastic flow.

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