scholarly journals Fatigue strength of longitudinal load-carrying welds in beams made of ultra-high-strength steel

2021 ◽  
Vol 179 ◽  
pp. 106563 ◽  
Author(s):  
Tuomas Skriko ◽  
Kalle Lipiäinen ◽  
Antti Ahola ◽  
Heli Mettänen ◽  
Timo Björk
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Longitudinal Load ◽  
Ultra High Strength Steel ◽  
Load Carrying

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.

Fatigue strength characterization of high and ultra-high-strength steel cut edges

2021 ◽  
Vol 228 ◽  
pp. 111544
Author(s):  
Kalle Lipiäinen ◽  
Antti Ahola ◽  
Tuomas Skriko ◽  
Timo Björk
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Ultra High Strength Steel ◽  
Strength Characterization

Improvement of Fatigue Strength of Hole Edge of Ultra-High Strength Steel Sheet by Punching Process Including Thickening

2016 ◽  
Vol 716 ◽  
pp. 428-434 ◽  
Author(s):  
Yohei Abe ◽  
Ken-Ichiro Mori ◽  
Ryota Kosaka
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Bending Fatigue ◽  
Hole Edge ◽  
Tensile Fatigue ◽  
Ultra High Strength Steel ◽  
Bending Fatigue Strength ◽  
Punching Process

The effect of the hole edge shape formed by a punching process including thickening on the fatigue strength of the hole of ultra-high strength steel sheets was investigated. The bending and tensile fatigue tests of the thickened hole edge were performed. For the bending fatigue strength, the high height of hole edge was effective because of high bending stiffness. Although the high tensile stiffness was important for the high tensile fatigue strength, the shape of hole edge was alternative. To increase both the bending and tensile fatigue strengths, a compressive process in rollover of hole edge was added for the thickened sheet having a high bending fatigue strength. It was found that the thickened and compressed hole edge of ultra-high strength steel sheet was effective in improving both the bending and tensile fatigue strengths.

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