Subject:
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Re: My Pictures From Brickfest
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Jul 2002 12:59:17 GMT
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Viewed:
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2485 times
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In lugnet.robotics, Thomas Avery writes:
> In lugnet.robotics, Rob Doucette writes:
> > In practice, given the length of the members in Doug's model I'd expect them
> > to behave as slender columns when loaded...
>
> And those would be the compression members of the truss.
>
> > ... (by leaning on it as opposed to the
> > weight of the pick n place mechanism which didn't seem to add much load).
>
> At just a glance (i.e. no proper analysis), I imagine that when you "leaned"
> on it, you'll have a few members in tension somewhere in the structure.
>
> The structure will deflect very little. Even those seemingly long members
> that are in compression may not deflect much at all. I imagine it takes
> quite a bit of load before you see them buckle elastically.
I'm guessing the members would delaminate (the plates capping the double
beams would separate) especially if the loading is cyclical. I still think
a long column will describe the behaviour more so than a truss because of
the length.
I don't know what the critical load would be for this stucture, could be a
fun excercise if you've got the time.
-Rob.
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Message has 1 Reply:
 | | Re: My Pictures From Brickfest
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| (...) You're comparing apples to oranges here. Within a truss, you will have members in compression. Column analysis (i.e. Euler buckling, and the like) can be applied to those memebers. To say that it behaves more like a slender column than a truss (...) (24 years ago, 26-Jul-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: My Pictures From Brickfest
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| (...) And those would be the compression members of the truss. (...) At just a glance (i.e. no proper analysis), I imagine that when you "leaned" on it, you'll have a few members in tension somewhere in the structure. The structure will deflect very (...) (24 years ago, 26-Jul-02, to lugnet.robotics)
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