Numerical investigation of residual formability and deformation localization during Continuous-Bending-under-Tension

Chetan P. Nikhare, Brad L. Kinsey, Yannis Korkolis

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

2 Scopus citations

Abstract

A ubiquitous experiment to characterize the formability of sheet metal is the standard uniaxial tension test. Past research [1-3] has shown that if the material is repeatedly bent and unbent during this test (termed Continuous-Bending-under-Tension, or CBT), the percent elongation at failure increases significantly (e.g., from 22% to 290% for an AISI 1006 steel [1]). However, past experiments have been conducted with a fixed stroke of the CBT device, which limits the formability improvements. This phenomenon has also been empirically observed in industry; the failure strains of a sheet which is passed through a drawbead (i.e., that has been bent and unbent three times before entering the die) are higher than those of the original sheet. Thus, the residual formability of the material after a specified number of CBT passes is of interest, to determine if multiple drawbeads would be beneficial in the process. Also of interest is the localization of the deformation during the process as this will provide a better physical understanding of the improved formability observed. In this paper, numerical simulations are presented to assess these effects. Results show that the formability during CBT is dictated by the uniaxial response of the material until the standard elongation at failure is exceeded. This limit can be exceeded by the CBT process. However, failure then occurs as soon as the CBT process is terminated. Also, the deformation is more uniformly distributed over the entire gauge length during the CBT process which leads to the increased elongations observed.

Original languageEnglish (US)
Title of host publicationASME 2012 International Manufacturing Science and Engineering Conference Collocated with the 40th North American Manufacturing Research Conf. and in Participation with the Int. Conf., MSEC 2012
Pages139-144
Number of pages6
DOIs
StatePublished - Dec 1 2012
EventASME 2012 International Manufacturing Science and Engineering Conference, MSEC 2012 Collocated with the 40th North American Manufacturing Research Conference and in Participation with the International Conference - Notre Dame, IN, United States
Duration: Jun 4 2012Jun 8 2012

Publication series

NameASME 2012 International Manufacturing Science and Engineering Conference Collocated with the 40th North American Manufacturing Research Conference and in Participation with the Int. Conf., MSEC 2012

Other

OtherASME 2012 International Manufacturing Science and Engineering Conference, MSEC 2012 Collocated with the 40th North American Manufacturing Research Conference and in Participation with the International Conference
CountryUnited States
CityNotre Dame, IN
Period6/4/126/8/12

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering

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    Nikhare, C. P., Kinsey, B. L., & Korkolis, Y. (2012). Numerical investigation of residual formability and deformation localization during Continuous-Bending-under-Tension. In ASME 2012 International Manufacturing Science and Engineering Conference Collocated with the 40th North American Manufacturing Research Conf. and in Participation with the Int. Conf., MSEC 2012 (pp. 139-144). (ASME 2012 International Manufacturing Science and Engineering Conference Collocated with the 40th North American Manufacturing Research Conference and in Participation with the Int. Conf., MSEC 2012). https://doi.org/10.1115/MSEC2012-7302