Flow stress equation in range of intermediate strain rates and high temperatures to predict roll force in four-pass continuous rod rolling

2013 ◽  
Vol 23 (3) ◽  
pp. 742-748 ◽  
Author(s):  
Sang-min BYON ◽  
Doo-hyun NA ◽  
Young-seog LEE
Keyword(s):  
Flow Stress ◽  
High Temperatures ◽  
Strain Rates ◽  
Roll Force ◽  
Stress Equation ◽  
Rod Rolling ◽  
Intermediate Strain Rates ◽  
Continuous Rod ◽  
Flow Stress Equation

Finite Element Analysis for the Tube Sinking Process of the Micro Ti-0.2Pd Tube

2013 ◽  
Vol 465-466 ◽  
pp. 693-698 ◽  
Author(s):  
Seok Kwan Hong ◽  
Jeong Jin Kang ◽  
Jong Deok Kim ◽  
Heung Kyu Kim ◽  
Sang Yong Lee ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Flow Stress ◽  
Internal Surface ◽  
External Diameter ◽  
Stress Equation ◽  
Element Analysis ◽  
Simulation Error ◽  
Simulation Results ◽  
Flow Stress Equation

In this study, the tube sinking process for manufacturing the micro Ti-0.2Pd tube (2.4 mm external diameter, 0.4 mm thickness) was simulated by finite element analysis. The external diameter of the initial tube was 5.0 mm. In order to simulate the tube sinking process, the flow stress equation was deducted from the result of the tensile test and friction coefficient was indirectly obtained through the parameter studies. The simulation results showed the simulation error according to the change of diameter predicted to be less than 2%. The defect of the internal surface by stress was found through the experiment result.

Dynamic Recrystallization and Microstructure Evolution in AZ31 Magnesium Alloy during Thermomechanical Processing

2005 ◽  
Vol 488-489 ◽  
pp. 215-218 ◽  
Author(s):  
Guang Jie Huang ◽  
Ling Yun Wang ◽  
Guang Sheng Huang ◽  
Fu Sheng Pan
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
High Temperatures ◽  
Critical Strain ◽  
Thermomechanical Processing ◽  
Stable State ◽  
Az31 Magnesium Alloy ◽  
Strain Rates ◽  
Peak Strain

The deformation behavior of AZ31 magnesium alloy has been investigated by isothermal compression at temperatures between 573-723K and at constant strain rates ranging from 10-3 -1s-1. It is shown that the form of flow stress curves is very sensitive to temperature and strain rate. In the experimental domain studied, the flow stresses are modeled using a power law with an average activation energy of 145.16 kJ/mol, and dynamic recrystallization (DRX) occurs. The critical strain for DRX is determined by analysis of flow stress curves. The ratio of the critical strain to the peak strain falls in the range of 0.4-0.5. At low temperatures and high strai rates, the deformation become macroscopically inhomogeneous, and the fracture of the specimens is accompanied by shear banding. Grain refinement resulting from DRX is less effective at high temperatures due to rapid grain growth. It is also shown that there is no difference between peak stress and stable state stress at high temperatures and lower strain rates, presenting the feature of continuous dynamic recrystallization (CDRX).

Effect of aging on hardness in the upsetting tests using experimental and finite element investigations

2016 ◽  
Vol 231 (24) ◽  
pp. 4512-4520 ◽  
Author(s):  
Ch Hari Krishna ◽  
MJ Davidson ◽  
Ch Nagaraju
Keyword(s):  
Finite Element ◽  
Flow Stress ◽  
Equivalent Strain ◽  
Stress Equation ◽  
Cold Upsetting ◽  
Finite Element Software ◽  
Aging Conditions ◽  
Metal Hardness ◽  
Flow Stress Equation ◽  
Good Agreement

This paper investigates the hardness distribution in cold upsetting operation of the aged billets. Three sets of cylindrical billets were solutionized at 504 ℃ and then each set of billets were aged at 150 ℃ for a period of 9 h, 13 h, and 18 h, respectively. The billets were upset to different levels of strain and flow stress equation was evaluated for all the aging conditions. The flow stress equation was given as input to the finite element software and simulated to the same level of strain as in the case of experiments. An attempt to predict metal hardness was made by correlating the equivalent strain with the hardness. The hardness measurements predicted were in good agreement with the experimental results. The demand for producing billets with more hardness on the surface and softness inside encourages this investigation to measure hardness experimentally and theoretically.

New flow-stress equation of Ti6Al4V alloy

1995 ◽  
Vol 48 (1-4) ◽  
pp. 179-186 ◽  
Author(s):  
Yoshino Masahiko ◽  
Shirakashi Takahiro
Keyword(s):  
Flow Stress ◽  
Stress Equation ◽  
Flow Stress Equation
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