Obtain the strain from the model analysis solution

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Kun Zeng
Kun Zeng 2020-7-10
编辑： Amin Kassab-Bachi 2022-1-11
Hi all,
I did a model analysis by using PDE toolbox and obtained the solution (natural frequency; mode shape; mesh). However, I would like to get the strain from the result of the model analysis. I tried directly using the command "StrainRF=evaluateStrain(RF)", but it shows "Check for missing argument or incorrect argument data type in call to function 'evaluateStrain'." If there is any other method to get the strain from the model analysis result? I appreciate any assistance.
Regards,
Kun

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回答（1 个）

Ravi Kumar
Ravi Kumar 2020-7-10
Strain is in response to a applied loading. Modal analysis is a eigenvalue problem. So you won't be able to calculate strain from modal analysis. You might want to apply loading and solve a static/dynamic problem.
Regards,
Ravi
  2 个评论
Kun Zeng
Kun Zeng 2020-7-13
Hi Ravi,
Thank you for your reply. As I know for the modal analysis, the mode shape(s) is the deflection solution of the eigenvalue problem. Can I get the strain mode shape from the mode shape(s) results already obtained from the model analysis?
Thank you so much.
Regards,
Kun
Amin Kassab-Bachi
Amin Kassab-Bachi 2022-1-11
编辑：Amin Kassab-Bachi 2022-1-11
You can calculate the nodal strain from nodal deformation but it's not straightforward, and it depends on the element type. My supervisor showed me the code he wrote for a couple element types but I still need to find a solution for my case. I came across your question because I'm having a similar problem. Please let us know if you find/write the code.

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