Effect of Stress Relaxation on Springback of Steel Sheet in Warm Forming

Naoko Saito; Mitsugi Fukahori; Daisuke Hisano; H. Hamasaki; Fusahito Yoshida

doi:10.4028/www.scientific.net/KEM.725.671

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 725Effect of Stress Relaxation on Springback of Steel...

Effect of Stress Relaxation on Springback of Steel Sheet in Warm Forming

Abstract:

Springback of a high strength steel (HSS) sheet of 980 MPa grade was investigated at elevated temperatures ranging from room temperature to 973 K. From U-and V-bending experiments it was found that springback was decreased with increasing temperature at temperatures of above 573 K. Furthermore, springback was decreased with punch-holding time because of stress relaxation. In this work, the stress relaxation behavior of the steel was experimentally measured. By using an elasto-vicoplasticity model, the stress relaxation was described, and its effect on the springback of sheet metals in warm forming was discussed theoretically.

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Advances in Engineering Plasticity and its Application XIII

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Periodical:

Key Engineering Materials (Volume 725)

Pages:

671-676

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.725.671

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Online since:

December 2016

Authors:

Naoko Saito, Mitsugi Fukahori, Daisuke Hisano, H. Hamasaki, Fusahito Yoshida

Keywords:

Springback, Stress Relaxation, Warm Forming

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