How does Nastran calculate strain in CQUAD4 elements?

ECor
ECor Altair Community Member
edited January 2023 in Community Q&A

Hello everybody,

I have one simple and maybe silly question. But I cannot get to understand the strain results coming from Nastran.

I have searched the web to understand how strains are calculated in the software but I have not found anything.

Given that I am using a linear solution and an isotrope material, I thought about calculating the strain with the Hooke's law. I selected a random element, and In-Plane P1 (major) result. 

I had Stress = 21.71 [MPa] and E = 68258 [MPa] ---> Strain = Stress / E ---> Strain = 3.18e-04 = 0.0318%

Nevertheless, Nastran shows me a value of Strain = 2.39e-04 = 0.0239%

image

Do you know where this difference may come from ? 

Thanks in advance !

 

Cordially, 

                EC

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