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[yvzslm48]

Hello everyone

I'm working on a ballistic analysis on Ls-Dyna. Before I do my own simulations I'm trying to replicate an article right now. In that article a rigid ball smashes into a aluminum armor plate. Material model for aluminum is Johnson Cook and the values of it were given in article but when I run the simulation stress values looks weird. For instance X,Y and Z stress values all looks the same, there is NO shear stress whatsoever, there are only small dots of stress in von mises and tresca stress, effective plastic strain is non-existant and the bulge that appears when the ball penetrates through the armor seems too big. What could be causes of this? When I use simplified johnson cook model stress and strain values looks fine but when I switch to normal johnson cook everything looks wrong. Can somebody help please??? Pictures of my problem are in the link: https://imgur.com/a/nTRUaSL

[Nanda]

Hello User,

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Regards,

Nanda.

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[ErKo]

 

 

Hi

We can not help as my colleague said above.

Perhaps DChen has some feedback?

Also perhaps contact the authors of this paper to get more info on the FE model they did.

All the best

Erko