Vol. 10, No. 5, 2015

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ISSN: 1559-3959
Inverse problems in heterogeneous and fractured media using peridynamics

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

Vol. 10 (2015), No. 5, 573–590
DOI: 10.2140/jomms.2015.10.573
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.

Keywords
peridynamics, fractured media, inverse problems, digital image correlation
Milestones
Received: 26 November 2014
Revised: 5 November 2015
Accepted: 7 November 2015
Published: 10 December 2015
Authors
Daniel Z. Turner
Multiscale Science
Sandia National Laboratories
P.O. Box 5800
Albuquerque, NM 87185
United States
Bart G. van Bloemen Waanders
Optimization and UQ
Sandia National Laboratories
P.O. Box 5800
Albuquerque, NM 87185
United States
Michael L. Parks
Computational Mathematics
Sandia National Laboratories
P.O. Box 5800
Albuquerque, NM 87185
United States