Evaluation of DIC Based Forming Limit Curve Methods at Various Temperatures of Aluminum Alloys for Automotive Applications

Paper #:
  • 2017-01-0309

Published:
  • 2017-03-28
DOI:
  • 10.4271/2017-01-0309
Citation:
Rencheck, M., Zelenak, P., Shang, J., and Kim, H., "Evaluation of DIC Based Forming Limit Curve Methods at Various Temperatures of Aluminum Alloys for Automotive Applications," SAE Technical Paper 2017-01-0309, 2017, doi:10.4271/2017-01-0309.
Pages:
6
Abstract:
Aluminum alloys are increasingly utilized in automotive body panels and crash components to reduce weight. Accurately assessing formability of the sheet metal can reduce design iteration and tooling tryouts to obtain the desired geometry in aluminum stampings. The current ISO forming limit curve (FLC) procedure is a position dependent technique which produces the FLC based on extrapolation at the crack location. As aluminum sheet metal use increases in manufacturing, accurate determination of the forming limits of this material will be necessary prior to production. New time dependent methods using digital imaging correlation (DIC) account for variations in material behavior by continuously collecting strain data through the material necking point. This allows more accurate FLC determination that is necessary for efficient design in the automotive stamping industry. Two different time dependent FLC analysis techniques using DIC were evaluated and compared with the position dependent ISO technique. All of the techniques were tested at room and elevated temperatures with aluminum 6xxx and 7xxx alloys to show the versatility of the techniques. The resulting FLC diagrams were compared after analysis of the data. Regardless of the testing temperature both tested time dependent techniques resulted in minor variation between trials. The DIC time dependent techniques proved to be more efficient without sacrificing accuracy and consistency. Additionally, time dependent methods displayed less conservative values than the ISO method and the FLC obtained using time dependent method was generally more practical than the ISO method.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Standard
1989-01-01
Training / Education
2016-03-07
Standard
1989-01-01
Training / Education
2013-04-09
Technical Paper / Journal Article
2009-10-06
Training / Education
2013-04-09
Standard
2013-10-16
Training / Education
2013-04-09
Standard
2007-12-17