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Undefined material property 'E' required by Linear Elastic Material 1

Posted 2019/09/18 13:27 GMT-4 General, Introduction, Parameters, Variables, & Functions 7 Replies

D V
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This should be really easy but its driving me nuts. This is the error I get when I hit compute:

Undefined material property 'E' required by Linear Elastic Material 1 - Plot: surf1 (Surface)

I'm sure I have E set as a parameter and used in my material with the right variable and value. I've given this value multiple different names or just typed in the number and still it cannot seem to be used by comsol. Other variables are not giving me any troubles.

I've also tried to set the E at Linear Elastic Material 1 to user defined instead of material and gave the right value but to no avail.

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7 Replies Last Post 2019/09/23 9:02 GMT-4
Jeff Hiller COMSOL Employee

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Posted: 6 years ago 2019/09/18 13:37 GMT-4

Can you post your .mph file? A screenshot doesn't let other users poke around to see what may be going on elsewhere in your model set-up. If the file is too large to upload, you can clear all solutions and save it under a different name before posting that - it'll be much smaller.

Best,

Jeff

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Jeff Hiller
Can you post your .mph file? A screenshot doesn't let other users poke around to see what may be going on elsewhere in your model set-up. If the file is too large to upload, you can clear all solutions and save it under a different name before posting that - it'll be much smaller. Best, Jeff
D V
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Posted: 6 years ago 2019/09/19 8:57 GMT-4

Yeah sure, I'm new to comsol and trying to learn.

Yeah sure, I'm new to comsol and trying to learn.

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Jeff Hiller COMSOL Employee

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Posted: 6 years ago 2019/09/19 9:22 GMT-4

Hello DV, The file you posted doesn't seem to have the "Parameter estimation" node set up. Maybe it's the wrong file?

If I disable that node, the plot is generated without problem.

I also noticed that in the screenshot you attached in your first post there's a reference to a time t=0 in data set 1, which seems wrong since you don't have a transient analysis in the model. Perhaps it was left over from a previous iteration of your model?

Best,

Jeff

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Jeff Hiller
Hello DV, The file you posted doesn't seem to have the "Parameter estimation" node set up. Maybe it's the wrong file? If I disable that node, the plot is generated without problem. I also noticed that in the screenshot you attached in your first post there's a reference to a time t=0 in data set 1, which seems wrong since you don't have a transient analysis in the model. Perhaps it was left over from a previous iteration of your model? Best, Jeff
Edgar J. Kaiser Certified Consultant
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Posted: 6 years ago 2019/09/19 9:26 GMT-4
Updated: 6 years ago 2019/09/19 9:27 GMT-4

The model you uploaded is not complete. It stops when 'compiling equations'.

Oops, Jeff was quicker ..

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
The model you uploaded is not complete. It stops when 'compiling equations'. Oops, Jeff was quicker ..
D V
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Posted: 6 years ago 2019/09/23 8:39 GMT-4

Hi Jeff,

I just got to looking at it again. The parameter estimation can be disabled, not really sure why it's there. I just wanted to create the von mises plot as my next step. You said that it runs fine when you disable the parameter estimation but I still get the same error message. I included the file this time.

Thanks for helping me!

Hi Jeff, I just got to looking at it again. The parameter estimation can be disabled, not really sure why it's there. I just wanted to create the von mises plot as my next step. You said that it runs fine when you disable the parameter estimation but I still get the same error message. I included the file this time. Thanks for helping me!

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Jeff Hiller COMSOL Employee

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Posted: 6 years ago 2019/09/23 8:58 GMT-4

Hi D V,

Your file still contains that dubious reference to a time t=0 in the Stress plot group, so I simply solved the model (i.e. I right-click on the Study node and select Compute) and the plot comes out nicely.

Best,

Jeff

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Jeff Hiller
Hi D V, Your file still contains that dubious reference to a time t=0 in the Stress plot group, so I simply solved the model (i.e. I right-click on the Study node and select Compute) and the plot comes out nicely. Best, Jeff
D V
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Posted: 6 years ago 2019/09/23 9:02 GMT-4

Ah right, I got it to work. I think the problem was indeed the t=0. Thank you very much!

Ah right, I got it to work. I think the problem was indeed the t=0. Thank you very much!

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