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Sinew Mechanical Properties

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blindarcher:
Hi All!  This is a rather nerdy question, so I apologize in advance.  It may not fall under what one might consider "primitive".  Please keep the responses respectable.  My question is does anyone know or have access to information about Modulus of Elasticity and Poisson's Ratio for sinew, particularly deer and elk or similar creature?  Data is lacking, and understandably so.  I cannot image anyone having an interest in such data other than a few oddballs such as myself.

mmattockx:

--- Quote from: blindarcher on May 24, 2022, 08:43:32 pm ---Hi All!  This is a rather nerdy question, so I apologize in advance.  It may not fall under what one might consider "primitive".  Please keep the responses respectable.  My question is does anyone know or have access to information about Modulus of Elasticity and Poisson's Ratio for sinew, particularly deer and elk or similar creature?  Data is lacking, and understandably so.  I cannot image anyone having an interest in such data other than a few oddballs such as myself.

--- End quote ---

A search on 'animal tendon mechanical properties' will turn up more data than you would expect. It seems that there has been a fair amount of academic research done on this topic for whatever reasons. The numbers vary widely and I don't think I have ever seen data for deer or moose that would be most applicable to bowyers. If you do find some data please post it here as I would be interested in it as well.


Mark

blindarcher:
Thanks Mark!  I did find several academic papers as you pointed out and found one or two of use, but marginal when considering the purpose.  The unfortunate thing is some of the papers I have yet to review because they cost to download.  Gone are the days when people are willing to share knowledge free of charge.  Bummer.  If I find something, I will share.

FYI, for poops and giggles, I have put together a rigid composite model for analysis of sinew backed bows.  That said, I am afraid it may not be applicable if the sinew acts as a hyperelastic material over the strains associated with drawing a bow.  In that case an energy based approach in characterizing the material may be needed, such as a Mooney Rivlin or Yeoh formulation.  Why would anyone go to this level of analysis? Mostly to quench the relentless thirst (which keeps me awake at night) for understanding the effects of sinew layers on a bow under a variety of environmental conditions (temperature and humidity).  The analysis will also look at the effect of moisture content on the underlying wood core.  So, all of this for which "primitive man" (the smart ones who came before us) already had a good understanding through practical experience.  This may be considered another case of "milking the chicken", where at the end of the day all one has to show for their efforts is sore fingers and an angry bird (assuming the bird does not enjoy the experience).

bradsmith2010:
I love practical experience,, )P(

blindarcher:
Thanks for all of your inputs.  I have been fortunate enough to find a few more academic papers that will keep me preoccupied and off the streets for awhile.

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