Effect of the ductility enhancement on the forming limit of the multilayer metallic sheet

T. Oya, C. Jeong, J. Yanagimoto, T. Koseki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this paper, the effect of ductility enhancement on the forming limit of the multilayer metallic sheet Is investigated. Multilayer metallic sheet consists of high-ductility soft material and high-strength hard material, and each constituent material Is layered alternately. The remarkable feature of this metal Is that the constituent hard layer can be elongated beyond its fracture strain. Geometric constraint by the soft layer plays a significant role In enhancing the ductility of the hard layer. This paper deals with this effect In terms of load transfer between the constituent materials. Using the load function of each component, the effect of the ductility enhancement is analyzed quantitatively. The mechanism presented In this paper clearly describes how a multilayer metallic sheet elongates and fractures. Namely, when the constituent soft layer attains to the maximum load, diffuse necking in the soft layer occurs, which immediately trigger the entire fracture of the sheet. To obtain a precise forming limit, the change of work-hardening property along with the above-mentioned mechanism should be treated. Investigations with experimental data verified the effectiveness of this treatment.

Original languageEnglish
Title of host publicationSpecial Edition
Subtitle of host publication10th International Conference on Technology of Plasticity, ICTP 2011
Pages622-627
Number of pages6
Publication statusPublished - 2011 Dec 1
Event10th International Conference on Technology of Plasticity, ICTP 2011 - Aachen, Germany
Duration: 2011 Sep 252011 Sep 30

Publication series

NameSpecial Edition: 10th International Conference on Technology of Plasticity, ICTP 2011

Other

Other10th International Conference on Technology of Plasticity, ICTP 2011
CountryGermany
CityAachen
Period11/9/2511/9/30

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Keywords

  • Analytical methods
  • Damage and failure analysis
  • Formability
  • Sheet forming

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Oya, T., Jeong, C., Yanagimoto, J., & Koseki, T. (2011). Effect of the ductility enhancement on the forming limit of the multilayer metallic sheet. In Special Edition: 10th International Conference on Technology of Plasticity, ICTP 2011 (pp. 622-627). (Special Edition: 10th International Conference on Technology of Plasticity, ICTP 2011).