Young-measure approximations for elastodynamics with non-monotone stress-strain relations
ESAIM: Modélisation mathématique et analyse numérique, Volume 38 (2004) no. 3, pp. 397-418.

Microstructures in phase-transitions of alloys are modeled by the energy minimization of a nonconvex energy density φ. Their time-evolution leads to a nonlinear wave equation u tt =divS(Du) with the non-monotone stress-strain relation S=Dφ plus proper boundary and initial conditions. This hyperbolic-elliptic initial-boundary value problem of changing types allows, in general, solely Young-measure solutions. This paper introduces a fully-numerical time-space discretization of this equation in a corresponding very weak sense. It is shown that discrete solutions exist and generate weakly convergent subsequences whose limit is a Young-measure solution. Numerical examples in one space dimension illustrate the time-evolving phase transitions and microstructures of a nonlinearly vibrating string.

DOI: 10.1051/m2an:2004019
Classification: 35G25, 47J35, 65P25
Keywords: non-monotone evolution, nonlinear elastodynamics, Young-measure approximation, nonlinear wave equation
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     title = {Young-measure approximations for elastodynamics with non-monotone stress-strain relations},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {397--418},
     publisher = {EDP-Sciences},
     volume = {38},
     number = {3},
     year = {2004},
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     zbl = {1130.74383},
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Carstensen, Carsten; Rieger, Marc Oliver. Young-measure approximations for elastodynamics with non-monotone stress-strain relations. ESAIM: Modélisation mathématique et analyse numérique, Volume 38 (2004) no. 3, pp. 397-418. doi : 10.1051/m2an:2004019. http://www.numdam.org/articles/10.1051/m2an:2004019/

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