On the strain dependence of plastic-strain ratio of deep-drawing sheet steels

1983 ◽  
Vol 14 (7) ◽  
pp. 1521-1523 ◽  
Author(s):  
Hsun Hu
Keyword(s):  
Plastic Strain ◽  
Deep Drawing ◽  
Strain Ratio ◽  
Plastic Strain Ratio ◽  
Strain Dependence ◽  
Sheet Steels

scholarly journals Physical Modelling and Numerical Simulation of the Deep Drawing Process of a Box-Shaped Product Focused on Material Limits Determination

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1058 ◽  
Author(s):  
Miroslav Tomáš ◽  
Emil Evin ◽  
Ján Kepič ◽  
Juraj Hudák
Keyword(s):  
Plastic Strain ◽  
Deep Drawing ◽  
Scaling Laws ◽  
Strain Ratio ◽  
Physical Models ◽  
Scale Model ◽  
Drawing Process ◽  
Plastic Strain Ratio ◽  
Thickness Change ◽  
Deep Drawing Process

Similitude theory helps engineers and scientists to accurately predict the behaviors of real systems through the application of scaling laws to the experimental results of a scale model related to the real system by similarity conditions. The theory was applied when studying the deep drawing process of a bathtub made from cold rolled low carbon aluminum-killed steel from the point of view of material limits. The bathtub model was created on the basis of geometric, physical, and mechanical similarity on a scale of 1:5. Thus, simulations and physical models were created. The simulation model was used to verify the combination yield locus/hardening law on the basis of comparing the thickness change. As a result, Hill 48/Krupkowski showed the minimal deviation by comparing data evaluated from numerical simulations and that measured on the physical model. Additionally, material anisotropy was modelled when virtual materials were defined from experimentally measured values of the plastic strain ratio. As an outcome, extra deep drawing quality steel with an average plastic strain ratio of rm ≥ 1.47 and an average strain hardening exponent of nm ≥ 0.23 must be used for the deep drawing of the bathtub.

scholarly journals The Elastic Strain Ratio, the Lüders Strain Ratio and the Evolution of r-Value During Tensile Deformation

1992 ◽  
Vol 19 (3) ◽  
pp. 175-188 ◽  
Author(s):  
Dominique Daniel ◽  
J. J. Jonas ◽  
J. Bussière
Keyword(s):  
Quantitative Analysis ◽  
Plastic Strain ◽  
Deep Drawing ◽  
Elastic Strain ◽  
Tensile Deformation ◽  
Empirical Relationship ◽  
Strain Ratio ◽  
Plastic Strain Ratio ◽  
R Value ◽  
Lüders Bands

The elastic counterpart of the plastic strain ratio is derived from ultrasonic data measured on twenty commercial deep drawing steels. It is shown that the observed variations in plastic r are related to the evolution of texture, and are not affected either by the elastic range of deformation or by the propagation of Lüders bands. Further quantitative analysis suggests that the elastic strain ratio, determined non-destructively, can be used to predict plastic r-values by means of an empirical relationship.

Calculation of Plastic Strain Ratio of Deep-Drawing Steel Sheets from Texture

2002 ◽  
Vol 408-412 ◽  
pp. 1103-1108
Author(s):  
Q.W. Jiang ◽  
Yu Dong Zhang ◽  
X. Zhao ◽  
Z.D. Liang ◽  
Fu Hui Wang ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Deep Drawing ◽  
Strain Ratio ◽  
Plastic Strain Ratio ◽  
Steel Sheets

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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