Effect of Bending Strain in Forming Limit Strain and Stress of IN-718 Sheet Metal

Sajun Prasad; Sushanta Kumar Panda; Sujoy Kumar Kar; S.V.S. Narayana Murty; S.C. Sharma

doi:10.4028/www.scientific.net/MSF.830-831.238

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HomeMaterials Science ForumMaterials Science Forum Vols. 830-831Effect of Bending Strain in Forming Limit Strain...

Effect of Bending Strain in Forming Limit Strain and Stress of IN-718 Sheet Metal

Abstract:

The forming limit diagram (ε-FLD) was estimated by deforming IN-718 sheet metal in different strain paths using a sub-size limiting dome height test set-up. The bending strains induced due to the use of smaller punch were estimated in all the strain paths, and the corrected ε-FLD was evaluated. The mathematical models such as Hill localized necking, Swift diffuse necking and Storen-Rice bifurcation theories were implemented to predict the limiting strains. In-order to avoid the path dependency of the ε-FLD during multi-stage forming process, stress based forming limit diagram (σ-FLD) was estimated using von-Mises and Hill-48 anisotropy plasticity theory with incorporation of Hollomon power hardening law. It was found that the bending strain influenced the limiting strains and stresses in the forming limit diagram. However, IN-718 material has encouraging formability in stretch forming process. The plot of the equivalent strains versus triaxiality indicated increasing limiting strain of the material in tension-tension mode.

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Periodical:

Materials Science Forum (Volumes 830-831)

Pages:

238-241

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.830-831.238

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Online since:

September 2015

Authors:

Sajun Prasad, Sushanta Kumar Panda*, Sujoy Kumar Kar, S.V.S. Narayana Murty, S.C. Sharma

Keywords:

Bending, Forming Limit Diagram, Inconel, Limit Stress, Limiting Strain, Stretch Forming

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* - Corresponding Author

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