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Unformatted text preview: Viscous flow converts the elastic strain into non-recoverable plastic deformation. The relationship between the stress and time is given by = o e t/ where is the relaxation time and characterizes the phenomenon of stress relaxation. is the time necessary for the stress to fall to 37% of the initial stress. Since viscous flow is a thermally activated process it should not be surprising that the relaxation time has an Arrhenius form: RT Q Ce-= 1...
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- Spring '09