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If tyrannosaurs were gregarious, perhaps a group of them harassing an ankylosaur could somehow overcome the armor and movement of the prey. Maybe a dug-in ankylosaur could be dug out by tyrannosaurs - would their feet be capable of scraping dirt?
Thomas Yazbeck
From: dinosaur-l-request@mymaillists.usc.edu <dinosaur-l-request@mymaillists.usc.edu> on behalf of Poekilopleuron <dinosaurtom2015@seznam.cz>
Sent: Tuesday, March 30, 2021 9:12 AM
To: Martin Bäker <martin.baeker@tu-bs.de>
Cc: dinosaur-l@usc.edu <dinosaur-l@usc.edu>
Subject: Re: [dinosaur] Turning ankylosaur over on its back
Thank you for interesting informations. So what do you suggest T. rex did when trying to take down an adult, grown ankylosaurus? Tom
---------- Původní e-mail ----------
Od: Martin Bäker <martin.baeker@tu-bs.de>
Komu: Poekilopleuron <dinosaurtom2015@seznam.cz>
Datum: 30. 3. 2021 14:02:37
Předmět: Re: [dinosaur] Turning ankylosaur over on its back
It seems no one has taken this on so I'll give it my 2 cents:
The maximum force a T.rex could exert with his legs was limited.
Simulations I did a looong time ago showed that a plausible maximum
force when standing on one leg is 1.5 body masses.
https://www.tandfonline.com/doi/abs/10.1671/039.029.0213
To turn over an Ankylosaur with a hind foot, the T. rex would have to
stand on one leg and this leg would have to bear the mass of the T. rex
plus the turning force; it seems implausible that this could be
possible.
>From a pure force point of view, things might look better when using
the mouth since both legs would then bear the force, but in order not
to opple over one leg would have to placed far forward, the other far
backward, which would readuce the maximum muscle force.
With a smaller Ankylosaur, I would think it might be possible, but I
doubt it is feasible with an 8-ton animal, especially since I would not
expect the ankylosaur to hold still while the T. rex looks for the
optimum lever arm position...
Disclaimer: I did not do any calculations to back this up, it is
based mainly on my physics intuition.
On Fri, 26 Mar 2021 07:03:48 +0100 (CET)
Poekilopleuron <dinosaurtom2015@seznam.cz> wrote:
> Good day!
>
>
>
>
> I was wondering if it is still plausible scenario that an adult
> ankylosaur could be turned on its back by a hind foot or a head of a
> large theropod? Are there any biomechanical studies about how big a
> force must be invested in order to turn say 8 ton _Ankylosaurus
> magniventris_ over? Thank you in advance! Tom
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Institut für Werkstoffe
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