Inverse problems in heterogeneous and fractured media using peridynamics

Daniel Z. Turner, Bart G. Van Bloemen Waanders, Michael L. Parks

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The following work presents an adjoint-based methodology for solving inverse problems in heterogeneous and fractured media using state-based peridynamics. We show that the inner product involving the peridynamic operators is self-adjoint. The proposed method is illustrated for several numerical examples with constant and spatially varying material parameters as well as in the context of fractures. We also present a framework for obtaining material parameters by integrating digital image correlation (DIC) with inverse analysis. This framework is demonstrated by evaluating the bulk and shear moduli for a sample of nuclear graphite using digital photographs taken during the experiment. The resulting measured values correspond well with other results reported in the literature. Lastly, we show that this framework can be used to determine the load state given observed measurements of a crack opening. This type of analysis has many applications in characterizing subsurface stress-state conditions given fracture patterns in cores of geologic material.

Original languageEnglish
Pages (from-to)573-590
Number of pages18
JournalJournal of Mechanics of Materials and Structures
Volume10
Issue number5
DOIs
StatePublished - 2015
Externally publishedYes

Keywords

  • Digital image correlation
  • Fractured media
  • Inverse problems
  • Peridynamics

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