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Strain rate sensitivity

What is strain rate sensitivity? What does it mean? I know the equation, but I am asking its physcal meaning. How do I know if a material is strain rate snesitive? Is there a way of calculating or measuring it? Thanks for your help.

please explain me the fundamental definitions for strain and stress with units and dimentions if there are??????

What is strain rate sensitivity? What does it mean? I know the
equation, but I am asking its physcal meaning. How do I know if a
material is strain rate snesitive? Is there a way of calculating or
measuring it? Thanks for your help.

yawlou's picture

 

I believe this is the answer.

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.

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

 

regards,

Louie

Great! Thanks indeed!

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