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Failure of Alumina in Torsion Tests
Author(s) -
Schwind Thomas,
Fünfschilling Stefan,
Kerscher Eberhard,
Lang KarlHeinz,
Oberacker Rainer,
Hoffmann Michael J.,
Fett Theo
Publication year - 2010
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000126
Subject(s) - torsion (gastropod) , materials science , failure mode and effects analysis , grinding , composite material , fatigue testing , structural engineering , engineering , medicine , surgery
Fatigue behavior under cyclic torsion loading shows a complicated dependency between the number of cycles to failure N f and the height of the applied load σ appl . A recently published result is chosen for which three clearly different regions are observed in which the normally straight log(N f )‐log(σ) plot shows different slopes. Whereas the high‐stress region near the torsion strength can be interpreted as normal mode‐I failure of randomly oriented surface cracks, the steep part may be understood as the consequence of friction degradation at grinding cracks which are under pure mode‐II and mode‐III loading. At lowest loads, quasi‐static subcritical crack growth support has to be expected with its commonly higher load exponents.