Explain the term ‘strain rate sensitive’. Show your references.

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Expert Solution

Strain rate sensitive means a material's stress versus strain characteristics are dependent on the RATE of loading.

Strain rate is the change in strain(deformation) of a material with respect to time.

The strain rate at some point within the material measures the rate at which the distances of adjacent parcels of the material change with time in the neighborhood of that point. It comprises both the rate at which the material is expanding or shrinking (expansion rate), and also the rate at which it is being deformed by progressive shearing without changing its volume (shear rate).

Case 1

Load a material fast and you get a stress versus strain diagram.

Case 2

Load the same material slow and you get another stress versus strain diagram.

If the stress strain diagrams are DIFFERENT for case 1 and case 2 then the material IS strain rate sensitive.

If the stress strain diagrams are the SAME for case 1 and case 2 then the material IS NOT strain rate sensitive.

At room temperature steel is regarded as NOT strain rate sensitive.

Viscoelastic materials are strain rate sensitive.

genius_generous answered 4 months ago

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