Learning Forum

[up1057819]

Hello everyone, 

 

I am trying to validate a model of a honeycomb unit cell with Ansys Mechanical APDL. In order to validate the model, I am trying to calculate the Young and shear modulus and compare them with the analytical equations from the book of Gibson & Ashby. 

My model consists of a regular hexagon ( l=h, θ=30 ) and I am applying a uniform displacement (seen in the photo below )  calculating the reaction force of the nodes at the bottom where the model is constrained and with Hookes law calculating E ( out of plane ).

(degree of freedom of the top nodes have been coupled in the Uy, longitude direction green mark in the model ) 

 

The results I get from the theoretical equations and the model have a deviation of 20% more or less which they shouldn't have. 

 

What could possibly be wrong? 

 

Thanks a lot!

[Ashish Khemka]

Hi Anotn,

You cannot calculate Young's modulus and Shear modulus - they are input to be provided by the user for the analysis.

Regards,

Ashish Khemka

[up1057819]

Hello Ashish Khemka,

 

And how do you validate that your model is working properly? 

[Ashish Khemka]

Anton, you will need to have experimental data or any other analytical calculations (like deformation and stress) to compare with the analysis results.

 

Regards,

Ashish Khemka