Young's Modulus of Chain
Young's Modulus of Chain
(OP)
I am trying to work out the elongation of a chain under shock loading. To allow me to do this I am looking for the 'effective' young's modulus of chain? Does anyone have any ideas or references?
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RE: Young's Modulus of Chain
RE: Young's Modulus of Chain
Is the chain loaded (taut) prior to receiving the shock? If not, there will be a lot of attenuation of the shock due to friction between the links as they move.
RE: Young's Modulus of Chain
RE: Young's Modulus of Chain
The chain itself is to act as a catching mechanism (backup) so will not be taut prior to loading and hence is an energy related problem.
I suppose I could model the links and work it out from the results but I think I would need to do it in either ansys or abaqus (those being the FE packages we have). The model would need to take account of brunelling at the contact surface, elongation of the link, bending of the link end and possible waisting. The software I have on desktop machine is just general frame analysis software (Staad and FS2000) and I dont think they are up to it. The R&D boys have the FE stuff in a different part of the office.
RE: Young's Modulus of Chain
No it wouldn't.
You were initially after an elastic approximation.
A back of envelope calcu'ation would consider a link of chain, width w, as being a couple of beams in series, width w, in single pont bending and with debatable end fixity.
Cheers
Greg Locock
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RE: Young's Modulus of Chain
I thought of that, but I think the top horizontal section will be in bending and would cause a very different flexibility to the model you describe.
Best to model one link exactly and then figure out the effective modulus as I stated above.
One more note - the links are welded together to form the loop, you will need to check that this is a full strength weld.
csd
RE: Young's Modulus of Chain
I would think that you could also send a section of the chain to a materials lab that could give you the load-deflection plot. It should be a fairly easy test to conduct.
Regards,
Rich
RE: Young's Modulus of Chain
For those of us who are lazy and like pretty pictures FEA does quite nicely, for the geometry I chose the deflection was 16 times as great as for a rod under tension.
htt
might work, or if not the top link in
http://www.geocities.com/greglocock/gallery
However, mine was effectively a square cross section, for obvious reasons a circular cross section would bend more, for given area
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Young's Modulus of Chain
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Young's Modulus of Chain
RE: Young's Modulus of Chain
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