Rigid projectile impact on sheet metal

Pegase33

Hello everyone,

 

I am trying to do a simulation of a rigid projectile (here a ball...) impact on sheet metal (or other material). I have already done an experimental test with an INSTRON Drop Weight Testers. For information, it is my first crash simulation.

 

The goal is to compare the results between simulation and experimental test. In a further point, it will be to analyse the rupture phenomenon.

 

I have created a ball and a sheet that I have meshed  and done everything about the parameters but... I have got two major errors :

 

• error in solid property : 226 - 312
• error in initial penetration in interface : 612

 

I have tried to search some information and correct the mistakes but... still not ok...

 

Someone can help me ? I will really appreciate your advice !

 

Kind regards,

Pegase33

 

 

Simon Križnik

Hi,

 

Use Tools>Model Checker>RadiossBlock to find modeling errors.

https://insider.altairhyperworks.com/wp-content/uploads/2017/09/T-T-1248-HyperMesh-Model-Checker.pdf

• There are solid as well as shell elements at the core of the sphere in the same component collector as the plate shell elements- this is invalid. Move the solid elements into another component referencing a solid element property. This will also resolve initial penetrations. In case of penetrations use the tools>penetration check.
• The velocity and Sphere SPC load collector should refer to the master node of a rigid element.
• the shell property is modified
• advanced mass scaling is applied

 

 

Unable to find an attachment - read this blog

Pegase33

Hi Hyperman,

 

Thank you for your answer. I will try to do it.

 

I keep you inform,

Pegase33

Pegase33

Hi Hyperman,

 

It is ok for the first point. It solved everything.

 

However I do not know how to find the number of the master node of a rigid element ? Then I can choose the node 'by id'.

 

Pegase33 /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

Simon Križnik

Hi,

 

there are a number of ways to find master node ID:

https://community.altair.com/community?id=community_question&sys_id=4c5644b61b2bd0908017dc61ec4bcbbc

 

Pegase33

Hi,

 

Thanks !  The calculation is in progress. Will see if it works ...

 

Pegase33

 

Pegase33

It works ! Thank you for everything Hyperman... See you for another issues... hmm...! Challenges !

 

Pegase33

 

Pegase33

s

 

 

Pegase33

Hello everyone,

 

The simulation for the steel is conform to the experimentation... However, it is not the case for the aluminium... (With my Drop Weight Tester, I have 10 mm of displacement and the simulation gives 5 mm)...

 

Have you got any ideas ?

 

Kind regards

 

Unable to find an attachment - read this blog