Theory of propagating deformation bands |
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Authors: | J Schlipf |
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Affiliation: | (1) Institut für Allgemeine Metallkunde und Metallphysik, Technische Hochschule, Aachen, FRG |
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Abstract: | A model for propagating deformation bands is developed, based on a mechanical equation of state and on evolution equations
for the structure parameters. It is shown that, contrary to normal deformation, it is necessary to discriminate between global
parameters which depend solely on time elapsed and local parameters which are functions of the strain history. Correspondingly,
two sets of equations are presented, one describing the development of the global parameters in the course of time, the other
giving the evolution of the local state parameters in the course of deformation, i.e. as a function of strain. Measurable
quantities derived from the first set are the load serrations and the band velocity, while the second set yields the flow
stress and the strain profile of the propagating band. |
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Keywords: | Plastic instability mechanical equation of state Portevin-Le Chatelier effect |
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