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Determination of the Forming Limit Strain of Sheet Metals by the Time-dependent Method
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  • Journal title : Transactions of Materials Processing
  • Volume 24, Issue 5,  2015, pp.361-367
  • Publisher : The Korean Society for Technology of Plasticity
  • DOI : 10.5228/KSTP.24.5.361
 Title & Authors
Determination of the Forming Limit Strain of Sheet Metals by the Time-dependent Method
Kim, S.G.; Oh, T.H.; Kim, J.D.; Kim, H.J.;
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 Abstract
The forming limit diagram (FLD) is the most commonly used tool for evaluating of sheet metal formability in the manufacturing field as well as the finite element analysis (FEA)-based design process. Determination of the forming limits is considerably influenced by testing/measuring machines, techniques and conditions. These influences may cause a large scatter in FLD from laboratory to laboratory. Scatter is especially true when the ‘position-dependent method’, as is specified in most national and international standards, is used. In the current study a new ‘time-dependent method’ is proposed, which is to determine the forming limit strains more accurately and reasonably when producing a FLD from experimental data. This method is based on continual strain measurement during the test. The results are compared to those from the existing standardized methods.
 Keywords
Time-dependent Method;ISO 12004-2;Forming Limit Strain;Forming Limit Diagram;Nakajima Test;
 Language
Korean
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