Computation and Visualization of Local Deformation for Multiphase Metallic Materials by Infimal Convolution of TV-Type Functionals

  • Frank Balle
  • Dietmar Eifler
  • Jan Henrik Fitschen
  • Sebastian Schuff
  • Gabriele Steidl
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9087)

Abstract

Estimating the local strain tensor from a sequence of microstructural images, realized during a tensile test of an engineering material, is a challenging problem. In this paper we propose to compute the strain tensor from image sequences acquired during tensile tests with increasing forces in horizontal direction by a variational optical flow model. To separate the global displacement during insitu tensile testing, which can be roughly approximated by a plane, from the local displacement we use an infimal convolution regularization consisting of first and second order terms. We apply a primal-dual method to find a minimizer of the energy function. This approach has the advantage that the strain tensor is directly computed within the algorithm and no additional derivative of the displacement must be computed. The algorithm is equipped with a coarse-to-fine strategy to cope with larger displacements and an adaptive parameter choice. Numerical examples with simulated and experimental data demonstrate the advantageous performance of our algorithm.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Frank Balle
    • 1
  • Dietmar Eifler
    • 1
  • Jan Henrik Fitschen
    • 2
  • Sebastian Schuff
    • 1
  • Gabriele Steidl
    • 2
  1. 1.Department of Mechanical and Process EngineeringUniversity of KaiserslauternKaiserslauternGermany
  2. 2.Department of MathematicsUniversity of KaiserslauternKaiserslauternGermany

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