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Rubber Block

Question asked by Christopher Hardy on Sep 18, 2013
Latest reply on Sep 18, 2013 by Jared Conway

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Hi,

Attached is a simple model of a rubber block (non-linear properties). I am having some problems with its material properties.

I have satisfied all the necessary fields in order to define the material, but I think the stress-strain curve I am using is causing some problems (derived from experiment).

Model details:

Symmetry constraint on 2 side faces.
Load currently just a 1 N force applied across top and bottom surface. (force vs time .dat file exist not applied yet to simply problem)
Automesh
Used reference geometry on bottom surface

I am pretty sure the problem lies within the material properties. I have simplified all the variables and it seems to solve if I use a simple material

Could someone please help. Thanks

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Rubber Block.rar.zip315.4 KB

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Jared Conway Sep 18, 2013 11:01 AM

What version and sp?

Have you spoken to your reseller about this?

Just to confirm, with a linear material the problem solves without issue?

What material model for nonlinear do you want to use?

In the long run, what are you trying to learn from the study?

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Christopher Hardy @ Jared Conway on Sep 18, 2013 11:09 AM

Its a 2012-2013 SP5.0 I believe
I have not spoke to the reseller no; I am with a university, trying to conduct research
Yes it solved with linear material, say picking steel
The model I would like to use is non-linear elastic, the material I am trying to model is under compression, the other methods seem like are for tensional purposes
Learn how rubber behaves under an impact load. Specifically its Strain-rate dependecy

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Jared Conway @ Christopher Hardy on Sep 18, 2013 11:30 AM

Learn how rubber behaves under an impact load. Specifically its Strain-rate dependecy < in this case, are you sure that nonlinear elastic is the best choice?

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Christopher Hardy @ Jared Conway on Sep 18, 2013 12:11 PM

Hi Jared,

I am not sure it is the best choice. I am trialing each one to see which gives the best result to match the experimental data.

But I am unable to work any of the models. I am not sure if the raw data I am obtaining matches what SolidWorks require

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Jared Conway @ Christopher Hardy on Sep 18, 2013 12:17 PM

where are you getting the data from? what is the raw data that you are entering. not necessarily just the numbers but is it engineering stress/strain, is it stretch ratio..etc.

if you care specifically about the strain-rate dependency, i'd recommend going through the material models in the help. i think you're going to see that there are very few that will support that need. and from there it will tell you what you need from an input perspective.

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Christopher Hardy @ Jared Conway on Sep 18, 2013 12:28 PM

Data is from an Instron Compression Tester. Compressing a rubber sample.

the .dat file is in the format of:

First Column: Strain Second Column: Stress

I will have a look at the materials model. Thanks

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Jared Conway @ Christopher Hardy on Sep 18, 2013 3:45 PM

so most likely true stress and strain. some materials require eng stress and strain as outlined in the help.

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7 Replies

Jared Conway Sep 18, 2013 11:01 AM
Mark Correct
Correct Answer
What version and sp?

Have you spoken to your reseller about this?

Just to confirm, with a linear material the problem solves without issue?

What material model for nonlinear do you want to use?

In the long run, what are you trying to learn from the study?
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- Christopher Hardy @ Jared Conway on Sep 18, 2013 11:09 AM
  Mark Correct
  Correct Answer
  Its a 2012-2013 SP5.0 I believe
  I have not spoke to the reseller no; I am with a university, trying to conduct research
  Yes it solved with linear material, say picking steel
  The model I would like to use is non-linear elastic, the material I am trying to model is under compression, the other methods seem like are for tensional purposes
  Learn how rubber behaves under an impact load. Specifically its Strain-rate dependecy
  Like • Show 0 Likes0
  Actions
  - Jared Conway @ Christopher Hardy on Sep 18, 2013 11:30 AM
    Mark Correct
    Correct Answer
    Learn how rubber behaves under an impact load. Specifically its Strain-rate dependecy < in this case, are you sure that nonlinear elastic is the best choice?
    Like • Show 0 Likes0
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    - Christopher Hardy @ Jared Conway on Sep 18, 2013 12:11 PM
      Mark Correct
      Correct Answer
      Hi Jared,
      
      I am not sure it is the best choice. I am trialing each one to see which gives the best result to match the experimental data.
      
      But I am unable to work any of the models. I am not sure if the raw data I am obtaining matches what SolidWorks require
      Like • Show 0 Likes0
      Actions
      - Jared Conway @ Christopher Hardy on Sep 18, 2013 12:17 PM
        Mark Correct
        Correct Answer
        where are you getting the data from? what is the raw data that you are entering. not necessarily just the numbers but is it engineering stress/strain, is it stretch ratio..etc.
        
        if you care specifically about the strain-rate dependency, i'd recommend going through the material models in the help. i think you're going to see that there are very few that will support that need. and from there it will tell you what you need from an input perspective.
        Like • Show 0 Likes0
        Actions
        Christopher Hardy @ Jared Conway on Sep 18, 2013 12:28 PM
        Mark Correct
        Correct Answer
        Data is from an Instron Compression Tester. Compressing a rubber sample.
        
        the .dat file is in the format of:
        
        First Column: Strain Second Column: Stress
        
        I will have a look at the materials model. Thanks
        Like • Show 1 Like1
        Actions
        Jared Conway @ Christopher Hardy on Sep 18, 2013 3:45 PM
        Mark Correct
        Correct Answer
        so most likely true stress and strain. some materials require eng stress and strain as outlined in the help.
        Like • Show 0 Likes0
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Rubber Block

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