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Dynamic impact analysis on FEA

Dynamic impact analysis on FEA

Dynamic impact analysis on FEA

(OP)
I have the mass of a polar bear 599kg and its speed in the water = 3.13 m/sec.  The bear impacts a vertical FE model (panel).  Is there an equivalent force method to input into RISA?  Thanks for any help!

RE: Dynamic impact analysis on FEA

Unless the polar bear is hitting the wall with his jetski, it will be a flesh on solid impact, so the impact time will be longer than with a solid on solid impact, which is known to be on the order of 0.1s.

I would think that one would start with that value, and then make some assumptions about what part of the polar bear actually impacts with the wall; can't imagine a polar bear that dumb, but...

So, now you have an area, a mass, and a deceleration.

TTFN

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RE: Dynamic impact analysis on FEA

You might want to send in the video of the polar bear on a jet ski testing one of your wall panels to America's Funniest Videos.

RE: Dynamic impact analysis on FEA

If you know the "deformation" of the bear it's just Newtons laws.

Basically, deceleration length = deformation and than you have deceleration / acceleration required to stop the bear. Than you know that acceleration * mass = Force.

And than its a static analysis. If you use the bears mass and multiply by 2 you get a conservative estimate for impact. You can probably find that in any decent dynamics book.

But I would like to see the polar bear on a jet ski.

Regards

Thomas

RE: Dynamic impact analysis on FEA

Thank god the bear is only 599 kg, and not 600. Can you imagine the impact of that..

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