Chapter
Apr 26, 2012
A Generalized, Three Dimensional Definition, Description, and Derived Limits of the Triaxial Failure of Metals
Authors: Kelly S. Carney [email protected], Paul A. DuBois, Murat Buyuk, and Steve KanAuthor Affiliations
Publication: Earth & Space 2008: Engineering, Science, Construction, and Operations in Challenging Environments
Abstract
Metal failure in many applications, such as ballistic impact, containment, shielding, and crashworthiness, with the exception of thin shells, occurs while the metal is in a three dimensional state of stress. Many previous definitions of triaxiality use two invariants to define the relative stress state in a virtual element, leading to a characterization that can be better thought of as biaxial. An additional, second parameter, based upon the third stress invariant is defined, which extends the characterization of the state of stress to three dimensions and to true triaxiality. The relation of the two parameters is explored and limits are found in the failure surface which aid in defining critical failure regions. Standard tests are compared to these regions of interest and new tests are proposed which envelope the limits of the failure surface, and thus define this failure surface.
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© 2008 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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NASA Glenn Research Center. E-mail: [email protected]
Paul A. DuBois
Consulting Engineer
Murat Buyuk
FHWA/NHTSA National Crash Analysis Center, George Washington University
Steve Kan
FHWA/NHTSA National Crash Analysis Center, George Washington University
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