Wrong ply numbering convention

Altair Forum User

Hello,

 

I am currently doing the optimization of a monocoque car body (CFRP and Aramid-core).

Free-size optimization was successful, but I have some doubts/questions about size optimization.

 

As you can see in the following picture, I get 277 plies (which seems to be excessive) after the free-size optimization. 

Furthermore, the plies designation doesn't comply the ply numbering convention (LPPSNN).

I don´t understand why, because I followed all the steps in the e-book 'Introduction to Practical Aspects of Composites'. 

 

I can share you my model if necessary.

<?xml version="1.0" encoding="UTF-8"?>

 

 

Thank you very much for any help and have a nice weekend.

Eric 

Altair Forum User

Hello,

 

I had a look to the topic below and I partially solved my problem. I reinstalled Hyperworks without the 2017.2.2 hotfix and now I get 16 plies (original ply number = 4).

https://community.altair.com/community?id=community_question&sys_id=dd96807a1b2bd0908017dc61ec4bcb76

However, the ply numbering convention is still violated. Do you have any idea why ?

 

Furthermore, I become following message after the size-optimization :

 

<?xml version="1.0" encoding="UTF-8"?>

 

What does 'small design change' mean ? 

I find it strange that the mass is unaltered during size-optimization. 

 

Thank you in advance.

Eric