Composite sandwich panel

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Hi AlessandroC

It seems that the Engine output requests have not been defined properly in your model.

Instead of defining initial velocity and constrain at the rigid element, you can directly give it to the master node of the rigid.

Check these Radioss tutorials from online help that is similar to your model and try making changes to your model accordingly.

RDT: 3520

RDT: 3530

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

Thanks

Hi Pranav Hari

thanks for your reply

I used hypercrash to set up loadcases and I got inspired by tutorial RD-T:3060. Could it be the problem?

If I apply these fixes, I still have the follow result

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

Hi AlessandroC

Can you please share both the OUT files

Thanks

Hi AlessandroC

I meant the Radioss files; The starter & engine files.

Sorry for the confusion/emoticons/default_sad.png' srcset='/emoticons/sad@2x.png 2x' title=':(' width='20' />

Thanks

I hope I shared with you all the files. By the way, if you want to calculate them again, remember that they take no more than 1 min each

Any other suggestion?

I am really trying everthing but nothing help me to understand what is the point

Hi AlessandroC

I could figure out some errors in your model. Try modifying these parameters are run the simulation.

1. Check whether unit consistency is followed in your model. Check the units for Tstop, Tfreq and other time history files.

2. Material is not defined for your shell component. Assign appropriate material to your component

3. For the component Rigid, the card image assigned is PART. Change it to NONE.

UNIT CONSISTENCY.png

Try these changes and check whether its working

Thanks

1. Check whether unit consistency is followed in your model. Check the units for Tstop, Tfreq and other time history files.

2. Material is not defined for your shell component. Assign appropriate material to your component

3. For the component Rigid, the card image assigned is PART. Change it to NONE.

1. kN Kg mm ms is my global unit system. if you look at every single material I specified a local unit system kg/m/s in order to copy-paste faster fabric's properties: thas is very easy to do in hypercrash.

2. I did not defined material for my shell because it is made of two fabrics and a single orthotropic core. All I have to do is define the type17_stack prop, right?

3. if I use hypermesh, RBody is shown as a component, but not if I open it in hypercrash. I followed your advice by removing the card img Part, however solver still has the same issue

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

I tried to create again the same structure, I supposed there were some problems during mesh phase on the previous file, but it still has problems. anyone else has the same experience? a specific tutorial for radioss and composites laminates?

Hi AlessandroC

Have a look at this exercise on composite modelling with Radioss

Thanks

Thank you

It will be very helpful.

Where can I find any other exercises on the same topic?

Hi AlessandroC

Have a look at this exercise on composite modelling with Radioss

Thanks

According to your example, I tried to set up a sort of 3-points-bending test with two fixed rigid wall and another one that has a initial velocity.

I used as much data as I could to define composites: the upper cylinder rigid wall impacts with the sandwich shell, but it bounces back instead of crashing the plate

Hi AlessandroC

Is this the correct file which you have shared. It seems like there is still inconsistency in the unit system.

Please check the same

Thanks

Hi Pranav

I already check, it should be ok

Anyway, I made another problem inspired by your example 3.1: now the composite panel is a copy-pasted property and material data.

However, It still has issues that I do not understand

You could find all files attached there

Altair Forum User

Please check the load applied i.e imposed velocity ,for any impact case recommended load is the initial velocity

and also apply the contact between the Rwall and plate