Deformation and Fracture of ZrO2 (Y2O3) Porous Ceramics During Axial Compression Measured by Digital Image Correlation

The paper focuses on deformation of ZrO 2 −5.5 wt.% Y 2 O 3 ceramics with porosity of 30 to 50% induced by axial compression measured by the digital image correlation techniques. A comparative analysis is given to time dependences of the averaged localized strain accumulation along compressive and tensile stress axes calculated by digital image correlation in different areas of the fracture surface. It is found that strain and fracture of porous zirconia-based ceramics develop in stages. Time dependences of the averaged localized strain accumulation correlate with the strain hardening exponent obtained from stress-strain curves. Macroscopic strain localization is identified for zirconia. Spatiotemporal distribution of instantaneous localized strain along the loading axis measured for the specimen surface by digital image correlation, correlates with the porous ceramics fracture at a macro-level.