Composite optimization-Step3: shuffle optimization and cae-modelling

Digital_MM

Hello!

As a part of the student project I perform the composite optimization of the composite structure (fig.1- Composite structure).

I have a few questions:

1)When I specify interface surfaces according to books and manuals, there is an error (Fig.2-3,4) in displaying plies when modeling an external closed skin.

Is it?

• A display error and is there a possibility to compute correctly
•  An error in which correct computation cannot be performed
•  …..?

Is it necessary to change the strategy of CAE-modelling? Could you suggest any options to solve this problem?

Noticed Feature:

I choose the strategy of CAE-modelling (Fig. 5 - Element’s normal and sublaminates, fig.6-7 ply’s normal for sublaminates №2-3).

When I use 1 ply for sublaminates №4,5 then I have the display error (Fig. 8), but when I use 2 plies for sublaminates №2,3,4,5 or 3 plies (Fig. 9), or 2 plies for sublaminates №2,3 and 3 plies for sublaminates № 4,5 (Fig. 9) then display is correct (interfaces laminate is the same). If I compute with this display error, the results will be correct or not?

2. Is it possible to set links for plies of different sublaminates when performing shuffle optimization? How can I do it?

        For ex. The dependent i-Layer# of sublaminate #1 must be laid similarly to the leading j-layer of the sublaminate #2 (Fig.10)

    3. There is the following error when assigning a Sublaminate to a dshuffle variable: fig.11-12. Is it possible to assign Sublaminate for a dshuffle variable?

I would be grateful for your help!

Thomas Quenaon_21507

Hi,

 

Thank you for your interest on Composite Optimization.

1- Using Sublaminate is a way to create a stacking with our ply-based method. Your problem may be more suited to the use of zone based method. 

We propose both methods (zone-based + play-based) in HyperMesh to let the user choose the easiest to set up.

2- What would be the purpose ? Shuffle Optimization is only here the reorder the composite stacking in order to improuve its behaviour.

Options available for Shuffle Optimization are :

• MAXSUCC constraint indicates that the stacking sequence should contain no sections with more than a given number of successive plies with the same orientation
• PAIR constraint indicates that 45° and -45° plies should be paired together
• The CORE and COVER constraints specify stacking sequences for the core and cover layers, respectively. Plies are listed from the bottom surface upward, in respect to the element's normal direction

3- Here you have to select laminates for stacks.

 

BR-

Thomas