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Pegase33

Rigid projectile impact on sheet metal

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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

 

 

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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
 
 

Test-edit_0000.rad

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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 :)

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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

 

Valide1212(2).hm

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