Hierarchical Material Models for Fragmentation Modeling in NIF-ALE-AMR Metadata

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Title

  • Main Title Hierarchical Material Models for Fragmentation Modeling in NIF-ALE-AMR

Creator

  • Author: Fisher, A.
    Creator Type: Personal
  • Author: Masters, N.
    Creator Type: Personal
  • Author: Koniges, A.
    Creator Type: Personal
  • Author: Anderson, R.
    Creator Type: Personal
  • Author: Gunney, B.
    Creator Type: Personal
  • Author: Wang, P.
    Creator Type: Personal
  • Author: Becker, R.
    Creator Type: Personal
  • Author: Benson, D.
    Creator Type: Personal
  • Author: Dixit, P.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: Livermore, California
    Additional Info: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Date

  • Creation: 2007-08-28

Language

  • English

Description

  • Content Description: Fragmentation is a fundamental process that naturally spans micro to macroscopic scales. Recent advances in algorithms, computer simulations, and hardware enable us to connect the continuum to microstructural regimes in a real simulation through a heterogeneous multiscale mathematical model. We apply this model to the problem of predicting how targets in the NIF chamber dismantle, so that optics and diagnostics can be protected from damage. The mechanics of the initial material fracture depend on the microscopic grain structure. In order to effectively simulate the fragmentation, this process must be modeled at the subgrain level with computationally expensive crystal plasticity models. However, there are not enough computational resources to model the entire NIF target at this microscopic scale. In order to accomplish these calculations, a hierarchical material model (HMM) is being developed. The HMM will allow fine-scale modeling of the initial fragmentation using computationally expensive crystal plasticity, while the elements at the mesoscale can use polycrystal models, and the macroscopic elements use analytical flow stress models. The HMM framework is built upon an adaptive mesh refinement (AMR) capability. We present progress in implementing the HMM in the NIF-ALE-AMR code. Additionally, we present test simulations relevant to NIF targets.
  • Physical Description: 6 p. (0.5 MB)

Subject

  • Keyword: Flow Stress
  • Keyword: Fractures
  • Keyword: Fragmentation
  • STI Subject Categories: 36 Materials Science
  • Keyword: Us National Ignition Facility
  • Keyword: Mathematical Models
  • STI Subject Categories: 42 Engineering
  • Keyword: Polycrystals
  • Keyword: Targets
  • Keyword: Plasticity
  • Keyword: Algorithms
  • Keyword: Simulation
  • Keyword: Optics

Source

  • Conference: Presented at: IFSA Conference, Kobe, Japan, Sep 09 - Sep 14, 2007

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: UCRL-CONF-234451
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 917892
  • Archival Resource Key: ark:/67531/metadc886990

Note

  • Display Note: PDF-file: 6 pages; size: 0.5 Mbytes
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