Implementation of a pressure and rate dependent Forming Limit Diagram model into NIKE and DYNA

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The Forming Limit Diagram (FLD) has been used for decades as an aid to successful sheet metal forming. In this work, we describe the incorporation of the FLD technique into the DYNA and NIKE codes at LLNL along with applications that led to the developments. The algorithm is currently available in the public version of DYNA3D. Several augmentations of the basic technique have been made available due to the necessity of their incorporation to solve programmatic problems of interest at LLNL. Illustration of the use of the FLD model is shown for a dome geometry similar to that used in ... continued below

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20 p.

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Logan, R.W.; Thomas, D.B. & Young, G.K. June 1, 1995.

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Description

The Forming Limit Diagram (FLD) has been used for decades as an aid to successful sheet metal forming. In this work, we describe the incorporation of the FLD technique into the DYNA and NIKE codes at LLNL along with applications that led to the developments. The algorithm is currently available in the public version of DYNA3D. Several augmentations of the basic technique have been made available due to the necessity of their incorporation to solve programmatic problems of interest at LLNL. Illustration of the use of the FLD model is shown for a dome geometry similar to that used in the Limiting Dome Height (LDH) test. This early example uses the simplest FLD option (analogous to circle grid) and shows the relative merits of this method versus scalar plastic work in prediction of tearing. In a phenomenological extension of the method, a pressure-dependent (FLD+P) method is used to successfully predict the relative design merits of stainless steel forgings. A final application to sheet stamping of a Boeing 757 door frame shows how the scatter plot circle grid option and strain path plots can be used to predict when preforms and intermediate anneals are necessary. The phenomenological nature of the FLD model as implemented is discussed relative to alternative approaches of calculating the FLD and its path dependence.

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20 p.

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OSTI as DE96000085

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  • 1995 International mechanical engineering congress and exhibition, San Francisco, CA (United States), 12-17 Nov 1995

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  • Other: DE96000085
  • Report No.: UCRL-JC--105760
  • Report No.: CONF-951135--19
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 110807
  • Archival Resource Key: ark:/67531/metadc624425

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 18, 2016, 5:30 p.m.

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Logan, R.W.; Thomas, D.B. & Young, G.K. Implementation of a pressure and rate dependent Forming Limit Diagram model into NIKE and DYNA, article, June 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc624425/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.