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Quasi-static extension of a tensile crack contained in a viscoelastic-plastic solidFinal stretch criterion of failure is applied to the problem of quasi-static extension of a crack embedded in an elastic-plastic or viscoelastic-plastic matrix. The slow growth under subcritical conditions in a rate-sensitive Tresca solid is shown to be a superposition of creep rupture and McClintock's ductile growth. This type of growth occurs at subcritical magnitude of the imposed K-factor and can be accounted for only through a recognition of inelastic properties of solids. In the subcritical range there is no unique value for K sub c independent of geometrical configuration and flaw size. Not only the produced states of stress and strain are dependent on the loading path, but also the material resistance to fracture turns out to be a function of the history of loading that precedes catastrophic failure. A nonlinear integro-differential equation of motion is derived for a crack progressing through a viscoelastic medium with some limited ability to plastic flow. Examples of numerical integration are given incorporating both monotonic and cyclic loading programs.
Document ID
19740030506
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wnuk, M. P.
(South Dakota State University Brookings, S. Dak., United States)
Date Acquired
August 7, 2013
Publication Date
November 1, 1973
Subject Category
Structural Mechanics
Report/Patent Number
ASME PAPER 73-WA/APM-15
Meeting Information
Meeting: Winter Annual Meeting
Location: Detroit, MI
Start Date: November 11, 1973
End Date: November 15, 1973
Sponsors: American Society of Mechanical Engineers
Accession Number
74A13256
Funding Number(s)
CONTRACT_GRANT: NGR-42-003-006
Distribution Limits
Public
Copyright
Other

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