validation

- September 20, 2022 at 7:50 am
  
  up1057819
  Subscriber
  
  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!
- September 22, 2022 at 11:09 am
  
  Ashish Khemka
  Ansys Employee
  
  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
  - September 22, 2022 at 11:26 am
    
    up1057819
    Subscriber
    
    Hello Ashish Khemka,
    
    And how do you validate that your model is working properly?
- September 22, 2022 at 11:28 am
  
  Ashish Khemka
  Ansys Employee
  
  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

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