scholarly journals Improvement in Fatigue Strength of Ultra-high Strength Steel Sheets by Hole Thickening

2014 ◽  
Vol 55 (645) ◽  
pp. 944-948
Author(s):  
Yohei ABE ◽  
Purwo KADARNO ◽  
Ken-ichiro MORI ◽  
Tatsuro ABE
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Sheets ◽  
Ultra High Strength Steel

scholarly journals Review of Shearing Processes of High Strength Steel Sheets

2020 ◽  
Vol 4 (2) ◽  
pp. 54 ◽  
Author(s):  
Ken-ichiro Mori
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Sheets ◽  
Sheared Edge ◽  
Ultra High Strength Steel ◽  
Edge Quality ◽  
Automobile Parts

Shearing processes of high strength steel sheets increasingly applied to lightweight automobile parts were reviewed. With the increase in strength of the high strength steel sheets, shearing operations become hard. First, the sheared edge quality in shearing of high strength steel sheets and the effects on the formability and fatigue strength were shown. Next, ironing processes with a taper punch and a punched slug, a slight clearance punching with a punch having a small round corner and a thickening process of the sheared edge were explained as processes for improving the sheared edge quality. Finally, hydrogen-induced delayed fractures of cold-sheared ultra-high strength steel sheets and of hot-trimmed parts were evaluated.

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