a Ideal elastic strain b∽0o= B Ideal viscous strain strain, e strain-rate, e C Ideal elastoviscous strain at constant Stress: an VISCOUS Instantaneous oc元 bn0 vIscouS yield stress elastic strain is elastic elastic followed by viscous time. t strain, e strain for a stress of longer duration Mechanical behavior of materials D Ideal elastoplastic strain: elastic strain at low values of stress is replaced by viscous strain above the yield stressMechanical behavior of materials A Ideal elastic strain B Ideal viscous strain C Ideal elastoviscous strain at constant Stress: an instantaneous elastic strain is followed by viscous strain for a stress of longer duration D Ideal elastoplastic strain: elastic strain at low values of stress is replaced by viscous strain above the yield stress