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Hey guys!

 

I made a tutorial of composite optimization which contains a ply smoothing steps. The name of the tutorial: OS-T: 3400 Design an Open Hole Tension (OHT).

 

The model setup was the same and I got the same result for linear static analysis just like in the tutorial. The optmization went well, I got the same result as you can see on the attached picture. In the tutorial the name of the plies are different because I use the version 2017.2 . I have 2 plies which contain the same element like in the tutorial.

image.thumb.png.b67297d7647e8545a0810455456ee4f8.png

After free-size optimization I made the next step: OSSMOTH. It gave me some funny result as you can see on the pictures. You can see the settings are the same and the results still different.

image.thumb.png.a7be719dc8e733e3e2b1ab4efa88c8e0.png

 

On the 3rd picture you can see the OSSMOTHING result from the tutorial. You can see that the settings are the same but the results are very different.

 

image.thumb.png.58f79dc77217fbc7661967d7d6b7f029.png

 

Could someone explain why I got so different result?

 

Thanks for your answer in advance!

 

Best regards,

Imre

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Hi @Imre

 

I see 22 plies after freesize. This could be because of the splitting of disconnected plies. 

 

Please add Control cards>> DEBUG,FS-SPLIT , 0 and check if this helps.

debug.png

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Hi Prakash!

 

I add control cards DEBUG, FS-SPLIT. After the free-size I got 16 plies just like in the tutorials, and the shape and thickness of the plies were the same.

But OSSMOOTH algorithm seems a little bit problematic as you can see on the picture.

image.thumb.png.639634f09b548ae509b95787afaf9805.png

 

I sent you the updated .fem file via your file transfer page. Could you run an OSSMOOTH with the same settings to see what kind of results you got?

Thank you for your help!

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@Imre

 

I think the problem is with the OSSmooth module. I will report this to the Development team.

 

You can try Geometry ply smoothing which is available in Aerospace profile. That gave close results but not exactly the same. 

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Hi Prakash!

 

Thanks for your help! With Geometry ply smoothing I was able to get something similar. I think I have just to make some magic with the settings (iteration steps, area ratio etc.).

I read a former topic about the ply-shape smoothing where you wrote that "Area ratio: local region area / total design area (real value between 0.0 and 1.0. Default=0.01)".
 

Are the area ratio calculation method the same in OSSMOOTH and in the Geometry Ply Smoothing (in Aerospace menu)?

Ps.: where can I check such tip&tricks that you wrote me before about the debug control card? I did not find the debug card in the HM, HW, or Optistruct help. In the help of control cards that is all about debug card: "
Some special or custom features can be accessed through the use of 'debug, <string>, <real>' statements.", which is not so much help for me.

 

Thanks for your help in advance!

 

Imre

 

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Hi Prakash!

 

Thanks for all of your help!
I am aware of  tip&trick topic on altairuniversity website. I like the support and the development of the Altair, thanks for all!

 

Best regards,

Imre

 

 

 

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