TY - GEN
T1 - Effect of the ductility enhancement on the forming limit of the multilayer metallic sheet
AU - Oya, T.
AU - Jeong, C.
AU - Yanagimoto, J.
AU - Koseki, T.
PY - 2011/12/1
Y1 - 2011/12/1
N2 - 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.
AB - 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.
KW - Analytical methods
KW - Damage and failure analysis
KW - Formability
KW - Sheet forming
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M3 - Conference contribution
AN - SCOPUS:84898069646
SN - 9783514007840
T3 - Special Edition: 10th International Conference on Technology of Plasticity, ICTP 2011
SP - 622
EP - 627
BT - Special Edition
T2 - 10th International Conference on Technology of Plasticity, ICTP 2011
Y2 - 25 September 2011 through 30 September 2011
ER -