Temperature and strain rate dependent flow criterion for bcc transition metals based on atomistic analysis of dislocation glide

2009 ◽  
Vol 100 (3) ◽  
pp. 315-321 ◽  
Author(s):  
Roman Gröger ◽  
Vaclav Vitek
Keyword(s):  
Transition Metals ◽  
Strain Rate ◽  
Dislocation Glide ◽  
Rate Dependent ◽  
Dependent Flow ◽  
Flow Criterion

A Modified Peric Model for Al-Mg Alloy Sheet with Rate-Independent Initial Yield Stress at Warm Temperatures

2019 ◽  
Vol 287 ◽  
pp. 3-7
Author(s):  
Yong Zhang ◽  
Qing Zhang ◽  
Yuan Tao Sun ◽  
Xian Rong Qin
Keyword(s):  
Flow Stress ◽  
Plastic Strain ◽  
Strain Rate ◽  
Yield Stress ◽  
Constitutive Models ◽  
Mg Alloy ◽  
Initial Yield Stress ◽  
Initial Yield ◽  
Rate Dependent ◽  
Dependent Flow

The constitutive modeling of aluminum alloy under warm forming conditions generally considers the influence of temperature and strain rate. It has been shown by published flow stress curves of Al-Mg alloy that there is nearly no effect of strain rate on initial yield stress at various temperatures. However, most constitutive models ignored this phenomenon and may lead to inaccurate description. In order to capture the rate-independent initial yield stress, Peric model is modified via introducing plastic strain to multiply the strain rate, for eliminating the effect of strain rate when the plastic strain is zero. Other constitutive models including the Wagoner, modified Hockett–Sherby and Peric are also considered and compared. The results show that the modified Peric model could not only describe the temperature-and rate-dependent flow stress, but also capture the rate-independent initial yield stress, while the Wagoner, modified Hockett–Sherby and Peric model can only describe the temperature-and rate-dependent flow stress. Moreover, the modified Peric model could obtain proper static yield stress more naturally, and this property may have potential applications in rate-dependent simulations.

Strain Rate Dependent Flow Stress and Energy Absorption Behaviour of Cast CrMnNi TRIP/TWIP Steels

2011 ◽  
Vol 82 (9) ◽  
pp. 1087-1093 ◽  
Author(s):  
L. Krüger ◽  
S. Wolf ◽  
S. Martin ◽  
U. Martin ◽  
A. Jahn ◽  
...  
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Energy Absorption ◽  
Rate Dependent ◽  
Twip Steels ◽  
Dependent Flow

Strain-Rate-Dependent Flow Stress and Failure of an Mg-PSZ Reinforced TRIP Matrix Composite Produced by Spark Plasma Sintering

2012 ◽  
Vol 83 (6) ◽  
pp. 521-528 ◽  
Author(s):  
Sabine Decker ◽  
Lutz Krüger ◽  
Sarah Richter ◽  
Stefan Martin ◽  
Ulrich Martin
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Spark Plasma Sintering ◽  
Matrix Composite ◽  
Rate Dependent ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Dependent Flow

scholarly journals Strain Rate Dependent Flow Stress Characterization Using Piezo-actuated Micropress

2014 ◽  
Vol 81 ◽  
pp. 1451-1456 ◽  
Author(s):  
Muhammad Taureza ◽  
Sylvie Castagne ◽  
Tegoeh Tjahjowidodo ◽  
Peng Hu
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Rate Dependent ◽  
Dependent Flow

Superplastic Deformation of an Al-Li-Cu-Zr Alloy under Uniaxial and Biaxial Tension

1990 ◽  
Vol 196 ◽  
Author(s):  
Ho-Sung Lee ◽  
Amiya K. Mukherjee
Keyword(s):  
Hydrostatic Pressure ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
Biaxial Tension ◽  
Tensile Elongation ◽  
Cavity Growth ◽  
Thickness Strain ◽  
Rate Dependent ◽  
Dependent Flow ◽  
Zr Alloy

ABSTRACTThe superplasticity of an Al-Li-Cu-Zr alloy has been studied under uniaxial tension and biaxial bulging conditions using hydrostatic pressure. An optimum tensile elongation of 850% at a strain rate of 3×10−4 /sec was obtained at 758 K. The maximum true thickness strain was 1.22 for a biaxially deformed specimen under the same conditions. It was shown that strain rate dependent flow hardening was related to necking profile. It was observed that cavity growth during superplastic deformation depended on the type of loading. Under biaxial bulging conditions, the cavities grew by forming cavity fissure networks along the grain boundaries. It was found that, by the superimposition of hydrostatic pressure, cavitation was retarded and the superplastic ductility was increased in both tensile and biaxial deformation.

A Modified Peric Model for Al-Mg Alloy Sheet with Rate-Independent Initial Yield Stress at Warm Temperatures

2018 ◽  
Vol 30 ◽  
pp. 8-12
Author(s):  
Yong Zhang ◽  
Qing Zhang ◽  
Yuan Tao Sun ◽  
Xian Rong Qin
Keyword(s):  
Flow Stress ◽  
Plastic Strain ◽  
Strain Rate ◽  
Yield Stress ◽  
Constitutive Models ◽  
Mg Alloy ◽  
Initial Yield Stress ◽  
Initial Yield ◽  
Rate Dependent ◽  
Dependent Flow

The constitutive modeling of aluminum alloy under warm forming conditions generally considers the influence of temperature and strain rate. It has been shown by published flow stress curves of Al-Mg alloy that there is nearly no effect of strain rate on initial yield stress at various temperatures. However, most constitutive models ignored this phenomenon and may lead to inaccurate description. In order to capture the rate-independent initial yield stress, Peric model is modified via introducing plastic strain to multiply the strain rate, for eliminating the effect of strain rate when the plastic strain is zero. Other constitutive models including the Wagoner, modified Hockett–Sherby and Peric are also considered and compared. The results show that the modified Peric model could not only describe the temperature-and rate-dependent flow stress, but also capture the rate-independent initial yield stress, while the Wagoner, modified Hockett–Sherby and Peric model can only describe the temperature-and rate-dependent flow stress. Moreover, the modified Peric model could obtain proper static yield stress more naturally, and this property may have potential applications in rate-dependent simulations.

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