Don't bend your wires, don't touch them at all!
Apr 19, 2011 at 11:51 AM Post #16 of 19

potatoe94

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is it that serious ? As normal bending such as wrapping them around your hand and storing them does not strain the copper in the cables ... if so i think my Headphones are all lousy now :s
 
Apr 19, 2011 at 12:11 PM Post #17 of 19

jcx

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Apr 19, 2011 at 10:35 PM Post #18 of 19

Steve Eddy

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Quote:
Shut-up-and-take-my-money.jpg


HA!
 
Love it!
 
se
 
 
 
 
Apr 20, 2011 at 1:16 AM Post #19 of 19

cegras

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[size=medium]


Quote:
You aren't really plastically deforming the Cu unless you bend the cable quite a bit. Therefore you aren't creating any dislocations.
 
Considering you are using drawn wire, there are already a massive amount of dislocations present, not to mention the low stacking fault energy of Cu, which gives it a huge propensity for twinning. 
smily_headphones1.gif



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Standard practice is to take a 0.1% offset as the plastic instability, although plastic deformation usually occurs before that.
 
http://en.wikipedia.org/wiki/Yield_(engineering)
 
Quote:
And I'm not sure where you are getting that info, but between coarse grained Cu and nanocrystalline Cu there is about an order of magnitude difference in the conductivity, not 2.
 
Just look at this paper about differences in conductivity due to twinning in nanocrystalline Cu
 
http://www.synl.ac.cn/org/mat/llu/PDF/japchen201006010686.pdf


Hibbard et al, 1958. Strain is different from grain size.
 
Grain size has a much smaller effect though .. only 2-3 times versus 1/d.
 
 

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