Stress Growth after Initiation of a Constant Shear Rate

Stress Growth after Initiation of a Constant Shear Rate 

If a viscoelastic liquid at rest is suddenly subjected to a constant shear strain rate 7, the stress will increase gradually to approach asymptotically the value yt)o. Its time dependence can be shown to be given by 

This time-dependent stress corresponds to 7 (r)7o in Bird, Armstrong, and Has- 

Time profile of a simple shear stress relaxation experiment following cessation of steady-state flow. 

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