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Fracture of plasma‐sprayed thick thermal barrier coatings under multiaxial stress states
Author(s) -
GAO H.,
SOCIE D. F.
Publication year - 2005
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2005.00906.x
Subject(s) - materials science , coalescence (physics) , composite material , perpendicular , torsion (gastropod) , shear (geology) , failure mechanism , failure mode and effects analysis , principal stress , ultimate tensile strength , shear stress , structural engineering , medicine , physics , mathematics , geometry , surgery , astrobiology , engineering
Failure behaviour of free‐standing plasma‐sprayed coatings was investigated under combined axial and shear loading. Thin‐walled tubular specimens were loaded with various combinations of tension/compression and torsion. This allows the failure surface to be established for loading situations where the two principal stresses are of opposite signs. Specimens failed in one of the two modes, a tensile failure perpendicular to the maximum principal stress or a compression shear failure through the thickness. Failure data were adequately described by the maximum principal stress theory. Stress–strain curves fall within a single scatter band depending on the failure mode. In situ deformation tests showed that the mechanism was microcrack closing and sliding in compression and microcrack opening, coalescence and the development of new microcracks in tension.