TY - JOUR
T1 - In situ quantitative three-dimensional characterisation of sub-indentation cracking in polycrystalline alumina
AU - Vertyagina, Yelena
AU - Mostafavi, Mahmoud
AU - Reinhard, Christina
AU - Atwood, Robert
AU - Marrow, T. James
PY - 2014
Y1 - 2014
N2 - The three-dimensional deformation beneath a Vickers indentation in polycrystalline alumina has been measured, in situ, by digital volume correlation of high resolution synchrotron X-ray computed tomographs. The displacement fields at the peak indentation load and after unloading are used to study the shape and orientation of sub-surface cracks induced by the indentation; lateral cracking due to residual stresses, bounded by a system of radial cracks, is revealed. For the first time, it is shown that radial cracks have mixed mode opening displacements, which are affected by the relaxation of residual stresses via lateral cracking. This novel technique may find applications in the study of surface damage by abrasive wear in brittle materials.
AB - The three-dimensional deformation beneath a Vickers indentation in polycrystalline alumina has been measured, in situ, by digital volume correlation of high resolution synchrotron X-ray computed tomographs. The displacement fields at the peak indentation load and after unloading are used to study the shape and orientation of sub-surface cracks induced by the indentation; lateral cracking due to residual stresses, bounded by a system of radial cracks, is revealed. For the first time, it is shown that radial cracks have mixed mode opening displacements, which are affected by the relaxation of residual stresses via lateral cracking. This novel technique may find applications in the study of surface damage by abrasive wear in brittle materials.
KW - Alumina
KW - Crack
KW - Digital volume correlation
KW - Indentation
UR - http://www.scopus.com/inward/record.url?scp=84901624122&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2014.04.002
DO - 10.1016/j.jeurceramsoc.2014.04.002
M3 - Article (Academic Journal)
AN - SCOPUS:84901624122
SN - 0955-2219
VL - 34
SP - 3127
EP - 3132
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 12
ER -