Premium
Some Kinetic Considerations Regarding the Double‐Torsion Specimen
Author(s) -
VIRKAR ANIL V.,
JOHNSON D. LYNN
Publication year - 1976
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1976.tb10931.x
Subject(s) - materials science , critical load , torsion (gastropod) , crack growth resistance curve , kinetic energy , fracture mechanics , mechanics , deflection (physics) , crack closure , shear (geology) , crack tip opening displacement , critical ionization velocity , composite material , structural engineering , classical mechanics , physics , engineering , medicine , surgery , buckling
In the double‐torsion specimen, crack velocity is a function of the shear wave velocity. At a constant load above the critical load required for crack propagation, crack velocity asymptotically approaches a constant value which is proportional to the shear wave velocity and is dependent on specimen geometry and load. The maximum possible crack velocity under a constant load is proportional to the shear wave velocity multiplied by the ratio of the specimen thickness to its width. For the case of constant deflection with an initial load greater than the critical load, crack velocity goes through a maximum and arrests, for a sufficiently long specimen. Testing‐machine compliance increases the length that such a crack will attain before arrest. The load required for rapid crack propagation is only slightly greater than the critical load; stable crack growth in the absence of stress corrosion guarantees an accurate determination of the fracture energy.