Experimental and numerical analysis of multilayered steel sheets upon bending

✍ Scribed by Tetsuo Oya; Nicolas Tiesler; Seiichiro Kawanishi; Jun Yanagimoto; Toshihiko Koseki

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 690 KB
• Volume: 210
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2010.07.003

✦ Synopsis

In this study, the bending formability of multilayered steel sheets is evaluated by tensile tests, V-bending tests, and hemming tests. Enhanced formability was observed in these experiments, namely, the constituent high-strength materials were elongated beyond the original fracture strain limit. As a result of this effect, multilayered steel sheets were successfully formed in V-bending tests and even in hemming tests. Observations using a scanning electron microscope verified that no delamination occurred at interfaces. To represent the geometrical features of a multilayered steel sheet, a solid-element model under an isostrain condition was utilized in finite element modeling, where the rule of mixtures was adopted to obtain the flow curve of the constituent high-strength material, and a good agreement with experimental results was observed. Analyses using this finite element model were conducted to investigate the effect of the geometry on the springback of multilayered steel sheets undergoing V-bending.