Instantaneous strain rate sensitivity of wrought AZ31 magnesium alloy

2013 ◽  
Vol 49 ◽  
pp. 173-180 ◽  
Author(s):  
E. Karimi ◽  
A. Zarei-Hanzaki ◽  
M.H. Pishbin ◽  
H.R. Abedi ◽  
P. Changizian
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Az31 Magnesium Alloy ◽  
Instantaneous Strain ◽  
Instantaneous Strain Rate Sensitivity

scholarly journals Influence on strain-rate history effects on the development of necking instabilities under dynamic loading conditions

2021 ◽  
Author(s):  
Nicolas Jacques ◽  
Jose Rodriguez-Martinez
Keyword(s):  
Strain Rate ◽  
Dynamic Loading ◽  
Strain Rate Sensitivity ◽  
Work Hardening ◽  
Rate Sensitivity ◽  
Neck Formation ◽  
History Effects ◽  
Instantaneous Strain ◽  
Instantaneous Strain Rate Sensitivity ◽  
Dynamic Loading Conditions

The present paper is devoted to the analysis of strain-rate history effects on neck formation under dynamic loading. For materials presenting strain-rate history effects, two different strain-rate sensitivities should be distinguished: the instantaneous strain-rate sensitivity and the work-hardening strain-rate sensitivity. We have analysed the relative contributions of these two kinds of strain-rate sensitivities to neck retardation for two different configurations: a bar under impact tension and a dynamically expanding ring. For this purpose, we have developed finite element models and, for the second configuration, an analytical model based on the linear stability analysis. The obtained results show that strain-rate history effects have a significant influence on the onset and development of necking. The reason of thisphenomenon is that, contrary to the instantaneous strain-rate sensitivity, the work-hardening strain-rate sensitivity does not contribute to delay the neck formation.

scholarly journals Strain rate sensitivity and mechanical anisotropy of selective laser melted 17-4 PH stainless steel

2014 ◽  
Vol 1 (5) ◽  
pp. SMM0049-SMM0049 ◽  
Author(s):  
Tyler LEBRUN ◽  
Kenichi TANIGAKI ◽  
Keitaro HORIKAWA ◽  
Hidetoshi KOBAYASHI
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Mechanical Anisotropy

scholarly journals Effect of Nitrogen Content on Hot Deformation Behavior and Grain Growth in Nuclear Grade 316LN Stainless Steel

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ming-wei Guo ◽  
Zhen-hua Wang ◽  
Ze-an Zhou ◽  
Shu-hua Sun ◽  
Wan-tang Fu
Keyword(s):  
Stainless Steel ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Grain Growth ◽  
Strain Rate Sensitivity ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Rate Sensitivity ◽  
Processing Maps ◽  
Hot Deformation Behavior

316LN stainless steel with 0.08%N (08N) and 0.17%N (17N) was compressed at 1073–1473 K and 0.001–10 s−1. The hot deformation behavior was investigated using stress-strain curve analysis, processing maps, and so forth. The microstructure was analyzed through electron backscatter diffraction analysis. Under most conditions, the deformation resistance of 17N was higher than that of 08N. This difference became more pronounced at lower temperatures. The strain rate sensitivity increased with increasing temperature for types of steel. In addition, the higher the N content, the higher the strain rate sensitivity. Hot deformation activation energy increased from 487 kJ/mol to 549 kJ/mol as N concentration was increased from 0.08% to 0.17%. The critical strain for initiation of dynamic recrystallization was lowered with increasing N content. In the processing maps, both power dissipation ratio and unstable region increased with increasing N concentration. In terms of microstructure evolution, N promoted dynamic recrystallization kinetic and decreased dynamic recrystallization grain size. The grain growth rate was lower in 17N than in 08N during heat treatment. Finally, it was found that N favored twin boundary formation.

scholarly journals Strain Rate Sensitivity Behaviour of a Chrome-Nickel Austentic-Ferritic Stainless Steel and its Constitutive Modelling

2018 ◽  
Vol 58 (10) ◽  
pp. 1840-1849 ◽  
Author(s):  
Amit Kumar ◽  
Aman Gupta ◽  
Rajesh Kisni Khatirkar ◽  
Nitish Bibhanshu ◽  
Satyam Suwas
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Ferritic Stainless Steel ◽  
Rate Sensitivity ◽  
Constitutive Modelling

Mechanical Behaviors Analysis and Johnson-Cook Model Establishment of 4Cr13 Stainless Steel

2013 ◽  
Vol 589-590 ◽  
pp. 45-51 ◽  
Author(s):  
Li Na Zhang ◽  
Peng Nan Li ◽  
Si Wen Tang ◽  
Wen Bo Tang ◽  
Shuai Zhang
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Temperature Sensitivity ◽  
Rate Sensitivity ◽  
Sensitivity Factor ◽  
Strain Rates ◽  
Mechanical Behaviors ◽  
Stress Strain ◽  
Cook Model

The stress-strain curves, mechanical behaviors, and Johnson-Cook model of 4Cr13 stainless steel were investigated at both the strain rates from 0.001s-1 to 7000s-1 and the temperatures from 293K to 673K based on the electronic universal testing machine and the split Hopkinson bar. The results showed that 4Cr13 stainless steel was very sensitive to the temperature and the strain rate. The temperature sensitivity factor decreased with increasing the temperature, and the strain rate sensitivity factor increased with increasing the strain rate. Both the temperature sensitivity factor and strain rate sensitivity factor decreased with increasing strain. The flow stress increased with strain rate and strain, but decreased with temperature. The J-C model prediction had a good agreement with the experimental stress-strain in the wide range of temperatures and strain rates. The Johnson-Cook model gave the foundation for finite element analysis during the cutting process.

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