Abstract
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. The model is shown to reproduce the basic features of the observed stress-strain curves.
Original language | English |
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Pages (from-to) | 50-59 |
Number of pages | 10 |
Journal | Acta Materialia |
Volume | 164 |
DOIs | |
State | Published - Feb 1 2019 |
Funding
Ryan Cooper is acknowledged for experimental assistance. I. Sevostianov and G. Bruno acknowledge financial support from DFG project BR 5199/3-1; M. Kachanov acknowledges support of the grant 14.Z50.31.0036 awarded to R. E. Alexeev Nizhny Novgorod Technical University by Department of Education and Science of the Russian Federation. A. Shyam thanks the following sponsors for funding (i) U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, as part of the Propulsion Materials Program and (ii) U.S Department of Energy, Office of Fossil Energy, Solid State Energy Conversion Alliance (SECA) Program. Ryan Cooper is acknowledged for experimental assistance. I. Sevostianov and G. Bruno acknowledge financial support from DFG project BR 5199/3-1; M. Kachanov acknowledges support of the grant 14.Z50.31.0036 awarded to R. E. Alexeev Nizhny Novgorod Technical University by Department of Education and Science of the Russian Federation . A. Shyam thanks the following sponsors for funding (i) U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies , as part of the Propulsion Materials Program and (ii) U.S Department of Energy, Office of Fossil Energy, Solid State Energy Conversion Alliance (SECA) Program .
Keywords
- Ceramics
- Hysteresis
- Nonlinearity
- Polycrystals
- Rocks
- Stress-strain relations
- Tension