Tsai failure criterion

Fernando Hernández Alonso_20813
Fernando Hernández Alonso_20813 Altair Community Member
edited March 2021 in Community Q&A

Hi there,

I don't really understand how Tsai criterion works. I know that failure happens when FI reaches 1, but inside Hyperview -> Composite Failure Index (s) there are two options:

-Failure Index: in my model this shows results below 1 at all points of the geometry. 

-Ply(s) with Maximum FI: this, however, shows results above 1 at pretty large portions of it. What does it exactly mean? Is the whole laminate going to fail? Is a single ply going to fail? Or instead, it means that a single ply would fail if there were not other plies in the laminate.

 

I attach the model in case I didn't make myself clear. 

Thank you in advance!

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Best Answer

  • Wesley Castro_21290
    Wesley Castro_21290
    Altair Employee
    edited March 2021 Answer ✓
    Fernando Hernández Alonso_20813 said:

    Hi Wesley!

    Thank you very much for your response, but having read it I am still not certain about how to interpret the results obtained in my model. 

    If "Failure Index is below" 1 but "Ply(s) with Maximum FI" is above 1, what is going to happen?

    And finally, is there any way to know which ply is the one with Maximum FI?

    Kind regards,

    Fernando

    Hi Fernando, 

     

    The "Ply with Maximum FI" option identifies which ply (id) has the max FI. In your case, ply 15 has the highest FI with a value of 0.596. 

     image

    Kind Regards, 
    Wesley

     

Answers

  • Wesley Castro_21290
    Wesley Castro_21290
    Altair Employee
    edited March 2021

    Hi Fernando, 

     

    Please refer to the forum post below. I believe it addresses your questions here. 

     

    https://community.altair.com/community?id=community_question&sys_id=d346c0b61b2bd0908017dc61ec4bcb99

     

    Best Regards, 

    Wesley

  • Fernando Hernández Alonso_20813
    Fernando Hernández Alonso_20813 Altair Community Member
    edited March 2021
    Wesley Castro_21290 said:

    Hi Fernando, 

     

    Please refer to the forum post below. I believe it addresses your questions here. 

     

    https://community.altair.com/community?id=community_question&sys_id=d346c0b61b2bd0908017dc61ec4bcb99

     

    Best Regards, 

    Wesley

    Hi Wesley!

    Thank you very much for your response, but having read it I am still not certain about how to interpret the results obtained in my model. 

    If "Failure Index is below" 1 but "Ply(s) with Maximum FI" is above 1, what is going to happen?

    And finally, is there any way to know which ply is the one with Maximum FI?

    Kind regards,

    Fernando

  • Wesley Castro_21290
    Wesley Castro_21290
    Altair Employee
    edited March 2021 Answer ✓
    Fernando Hernández Alonso_20813 said:

    Hi Wesley!

    Thank you very much for your response, but having read it I am still not certain about how to interpret the results obtained in my model. 

    If "Failure Index is below" 1 but "Ply(s) with Maximum FI" is above 1, what is going to happen?

    And finally, is there any way to know which ply is the one with Maximum FI?

    Kind regards,

    Fernando

    Hi Fernando, 

     

    The "Ply with Maximum FI" option identifies which ply (id) has the max FI. In your case, ply 15 has the highest FI with a value of 0.596. 

     image

    Kind Regards, 
    Wesley

     

  • Fernando Hernández Alonso_20813
    Fernando Hernández Alonso_20813 Altair Community Member
    edited March 2021
    Wesley Castro_21290 said:

    Hi Fernando, 

     

    The "Ply with Maximum FI" option identifies which ply (id) has the max FI. In your case, ply 15 has the highest FI with a value of 0.596. 

     image

    Kind Regards, 
    Wesley

     

    Thank you so much, Wesley! I wasn't interpreting the results properly, but now I get it. 

    I have one last question: Why are there zones with no Failure Index results? And is there any way to know if failure is or isn't going to happen in that zones?

    Thanks again

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