On-line measurement of plastic strain ratio of steel sheet using resonance mode EMAT

1993 ◽  
Vol 12 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Katsuhiro Kawashima ◽  
Takao Hyoguchi ◽  
Toshio Akagi
Keyword(s):  
Plastic Strain ◽  
Steel Sheet ◽  
Strain Ratio ◽  
Resonance Mode ◽  
Plastic Strain Ratio ◽  
Line Measurement ◽  
On Line

On-line measurement of texture, thickness and plastic strain ratio using laser-ultrasound resonance spectroscopy

Ultrasonics ◽  
2002 ◽  
Vol 40 (10) ◽  
pp. 1047-1056 ◽  
Author(s):  
A. Moreau ◽  
D. Lévesque ◽  
M. Lord ◽  
M. Dubois ◽  
J.-P. Monchalin ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Strain Ratio ◽  
Resonance Spectroscopy ◽  
Laser Ultrasound ◽  
Plastic Strain Ratio ◽  
Line Measurement ◽  
On Line

Effects of Electric Field Annealing on Recrystallization Texture and Plastic Strain Ratio (r-Value) of IF Steel Sheet

2007 ◽  
Vol 539-543 ◽  
pp. 3478-3483
Author(s):  
Xiang Zhao ◽  
Chang Shu He ◽  
J. Xu ◽  
Liang Zuo
Keyword(s):  
Plastic Strain ◽  
Electric Field ◽  
Steel Sheet ◽  
Strain Ratio ◽  
Fiber Texture ◽  
If Steel ◽  
Plastic Strain Ratio ◽  
Field Annealing ◽  
R Value ◽  
If Steel Sheet

Effects of electric field annealing on recrystallization texture and average plastic strain ratio (r value) of IF steel sheet were studied by mean of X ray diffraction ODF analysis and the tensile test. Specimens of 75% cold-rolled IF steel sheet were annealed at 850flC for 25min,with and without electric field annealing respectively. Results show that the electric field annealing does not change the type of recrystallization texture and its formation mechanism in IF deep-drawing steel sheet, but improves the formation and development of recrystallization i-fiber texture, enhances the intensity of i-fiber texture, and retards the formation and development of c-fiber texture. Comparing with the conventional annealing, electric field annealing improves the average plastic strain ratio (r value). Possible reasons for the intensification of recrystallization i-fiber texture with the electric field applied may attribute to the reduction of stored energy, thus hindering the formation of other orientated nuclei and enhancing the nucleating ratio of i-oriented nuclei. And the intensification of recrystallization i-fiber texture was considered as the main reason for the enhancement of the plastic strain ratio (r value) in IF steel sheet.

Effect of Cu Content on the Formability and Portevin-Le Chatelier Effect of Al-Mg Alloys

2015 ◽  
Vol 817 ◽  
pp. 150-157
Author(s):  
Peng Cheng Ma ◽  
Di Zhang ◽  
Lin Zhong Zhuang ◽  
Ji Shan Zhang
Keyword(s):  
Plastic Strain ◽  
Stress Drop ◽  
Strain Ratio ◽  
Mg Alloys ◽  
Dynamic Strain ◽  
Strain Hardening Exponent ◽  
Drawing Ratio ◽  
Plastic Strain Ratio ◽  
Cu Content ◽  
Al Mg Alloys

Al-Mg alloys developed for auto body sheets with different Cu contents were fabricated in the laboratory scale. The effects of Cu content on the microstructures, formability and Portevin–Le Chatelier(PLC) effect of the alloys were investigated by polarizied optical microscopy and room temperature tensile testing. It has been found that with increasing Cu content, there was little change of the strain hardening exponent, but the plastic strain ratio and limiting drawing ratio increased firstly and then decreased. A quantitative statistical analysis of the characteristics of the PLC effect was made, including the stress drop and the reloading time, which follow a common linear relationship with plastic strain, and the increase rate of stress drop and reloading time was bigger with more Cu content. A detailed discussion of the corresponding mechanism of Cu and Cu-containing precipitates on the dynamic strain aging(DSA) was made.

Determining Plastic Strain Ratio of Sheet Metal Based on Stereo Vision

2010 ◽  
Vol 30 (12) ◽  
pp. 3515-3523
Author(s):  
叶南 Ye Nan ◽  
张丽艳 Zhang Liyan
Keyword(s):  
Plastic Strain ◽  
Sheet Metal ◽  
Stereo Vision ◽  
Strain Ratio ◽  
Plastic Strain Ratio
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