Abstract
Hole expansion using a flat-bottomed cylindrical punch was carried out to clarify the fracture behavior of high-strength steel sheets by changing the initial hole diameter, d0. Experimental results showed that the hole expansion ratio, λ, became larger as the initial hole diameter, d0, increased. Moreover, the fracture site around the hole shifted considerably with the initial hole diameter, d0, in the case of high-strength steel sheets with high r-value. On the other hand, the analytical results exhibited poor coincidence with experimental ones when the initial hole diameter was small, whereas good correlation was observed with a large initial hole diameter. As a result, it was clarified that plastic deformation behavior during stretch flange forming performed using a flat-bottomed cylindrical punch is influenced not only by the planar anisotropy of the mechanical properties of steel sheets but also by the initial hole diameter.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Journal of the Japan Society for Technology of Plasticity
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.