206 Cyclic deformation behavior of precipitation hardened high strength steel sheet at warm temperature

2014 ◽  
Vol 2014.52 (0) ◽  
pp. _206-1_-_206-2_
Author(s):  
Yuya ICHIKAWA ◽  
Takashi SASAKI ◽  
Hiroshi HAMASAKI ◽  
Fusahito YOSHIDA ◽  
Naoko SAITO ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Steel Sheet ◽  
High Strength ◽  
Warm Temperature

Elasto-Plastic Property of High Strength Steel at Warm Temperature and its Springback

2013 ◽  
Vol 535-536 ◽  
pp. 385-388
Author(s):  
Naoko Saito ◽  
Mitsugi Fukahori ◽  
Daisuke Hisano ◽  
Yuya Ichikawa ◽  
Hiroshi Hamasaki ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
Elevated Temperatures ◽  
High Strength ◽  
Plastic Property ◽  
Bending Test ◽  
Warm Temperature ◽  
Temperature Dependent ◽  
Strain Responses ◽  
Springback Behavior

Stress-strain responses of a high strength steel sheet of 980MPa grade under uniaxial tension and its springback in V- and U-bending were investigated at elevated temperatures ranging from 573-973K. The flow stress decreased drastically with the increase of temperature, from which it was expected that springback is reduced by warm forming. In V-bending test, however, the temperature effect on springback was not so clear, while in U-bending springback decreased with temperature rise. It was found that such difference in temperature dependent springback behavior between V- and U-bending was caused by stress relaxation which took place during unloading process.

Effect of Material Anisotropies of Hot-Rolled High-Strength Steel Sheet on Localized Deformation Behavior in Hole Expansion - Part-I Experimental Consideration to Circular and Oval Hole

2016 ◽  
Vol 725 ◽  
pp. 592-597 ◽  
Author(s):  
Toshiya Suzuki ◽  
Kazuo Okamura ◽  
Yuya Ishimaru ◽  
Hiroshi Hamasaki ◽  
Fusahito Yoshida
Keyword(s):  
High Strength Steel ◽  
Deformation Behavior ◽  
Steel Sheet ◽  
High Strength ◽  
Localized Deformation ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Edge ◽  
Hole Expansion Test ◽  
Hot Rolled

In this study, the effect of the material anisotropies of hot-rolled high-strength steel sheet on localized deformation behavior in hole expansion test has been investigated experimentally. First, the hole expansion test with the circular hole has been conducted to investigate the effect of anisotropies of material properties on the localized deformation behavior around the hole edge. Next, the hole expansion test with the oval hole has been conducted to investigate the effect of the major axis direction of the oval hole on the localized deformation behavior around the hole edge. As a result, it was clarified that the effect of anisotropies of r-value and n-value on the localized deformation behavior is strong, especially the anisotropy of n-value.

104 Elasto-plastic behavior of high strength steel sheet at warm temperature and its springback

2012 ◽  
Vol 2012.50 (0) ◽  
pp. 10401-10402
Author(s):  
Daisuke HISANO ◽  
Yuya ICHIKAWA ◽  
Hiroshi HAMASAKI ◽  
Ryutarou HINO ◽  
Naoko SAITO ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Plastic Behavior ◽  
Warm Temperature
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