Micromechanical modeling of non-linear stress-strain behavior of polycrystalline microcracked materials under tension

Bruno, Giovanni; Kachanov, Mark; Sevostianov, Igor; Shyam, Amit

doi:10.1016/j.actamat.2018.10.024

Title: Micromechanical modeling of non-linear stress-strain behavior of polycrystalline microcracked materials under tension

Journal Article · Sat Oct 13 00:00:00 EDT 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.10.024· OSTI ID:1481704

^[1]; Kachanov, Mark ^[2];

^[3];

^[4]

Bundesanstalt fur Materialforschung und -prufung, Berlin (Germany); Univ. of Potsdam, Potsdam (Germany)
Tufts Univ., Medford, MA (United States); R.E.Alexeev Nizhny Novgorod Technical Univ., Nizhny Novgorod (Russia)
New Mexico State Univ., Las Cruces, NM (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The stress-strain behavior of microcracked polycrystalline materials (such as ceramics or rocks) under conditions of tensile, displacement-controlled, loading is discussed. Micromechanical explanation and modeling of the basic features, such as non-linearity and hysteresis in stress-strain curves, is developed, with stable microcrack propagation and “roughness” of intergranular cracks playing critical roles. Experiments involving complex loading histories were done on large- and medium grain size β-eucryptite ceramic. As a result, the model is shown to reproduce the basic features of the observed stress-strain curves.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy and Carbon Management (FECM)