Using nonlinear optimization methods to reverse engineer liner material properties from EFP tests

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The utility of variable metric nonlinear optimization methods for reverse engineering liner material constitutive modeling parameters is described. We use an effective new code created by coupling the nonlinear optimization code NLQPEB with the DYNA2D finite element hydrocode. The optimization code determines the ``best`` set of liner material properties by running DYNA2D in a loop, varying the liner model constitutive parameters, and minimizing the difference between the EFP profiles of the calculation and experiment. The results of four different EFP warhead tests with the same copper liner material are used to determine material parameters for the Steinberg-Guinan, Johnson-Cook, & Armstrong-Zerilli ... continued below

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10 p.

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Murphy, M.J. & Baker, E.L. February 27, 1995.

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  • Murphy, M.J. Lawrence Livermore National Lab., CA (United States)
  • Baker, E.L. Picatinny Arsenal, Dover, NJ (United States). Army Armament Research, Development and Engineering Center

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Description

The utility of variable metric nonlinear optimization methods for reverse engineering liner material constitutive modeling parameters is described. We use an effective new code created by coupling the nonlinear optimization code NLQPEB with the DYNA2D finite element hydrocode. The optimization code determines the ``best`` set of liner material properties by running DYNA2D in a loop, varying the liner model constitutive parameters, and minimizing the difference between the EFP profiles of the calculation and experiment. The results of four different EFP warhead tests with the same copper liner material are used to determine material parameters for the Steinberg-Guinan, Johnson-Cook, & Armstrong-Zerilli models. In a companion paper we describe the successful application of this methodology to the forward engineering of liner contours to achieve desired EFP shapes. The methodology of utilizing a coupled optimization/finite element code provides a significant improvement in warhead designs and the warhead design process.

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10 p.

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OSTI as DE95013264

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  • 15. international symposium on ballistics, Haifa (Israel), 21-24 May 1995

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  • Other: DE95013264
  • Report No.: UCRL-JC--117649
  • Report No.: CONF-950537--6
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 95591
  • Archival Resource Key: ark:/67531/metadc793470

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  • February 27, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 23, 2016, 12:51 p.m.

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Murphy, M.J. & Baker, E.L. Using nonlinear optimization methods to reverse engineer liner material properties from EFP tests, article, February 27, 1995; California. (digital.library.unt.edu/ark:/67531/metadc793470/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.