Unformatted text preview: Viscous flow converts the elastic strain into non-recoverable plastic deformation. The relationship between the stress and time is given by σ = σ o e –t/ τ where τ is the relaxation time and characterizes the phenomenon of stress relaxation. τ 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-= τ 1...
View Full Document
This note was uploaded on 08/10/2009 for the course ENGN 45 taught by Professor Wendy during the Spring '09 term at City College of San Francisco.
- Spring '09