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Strain rate sensitivity

Submitted by Wefefe on

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.

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Wefefe

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.

Wed, 02/25/2009 - 03:23 Permalink
yawlou

 

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

Wed, 02/25/2009 - 18:16 Permalink