ELR reloading article.. interesting data

[hounddawg]

I spent a good portion of the morning doing some basic research on ductility and elasticity and came to the conclusion that annealing does nothing to affect elasticity of the brass only the ductility because elasticity is at the atomic level where cold working only affects the brass at a crystiline level. While annealing can prevent neck splitting it will have no effect at all on neck tension.

Not a lot of fun learning my $300 Anealeeze is nothing more than a paperweight but life could be worse, I could have dropped a grand on a AMP

Now the good news for forum members is that temperature does affect the modulus of elasticity so there is a whole new batch of pins for the angels to tango on. That would mean the ammo, barrel and chamber temp will affect neck tension to a minor degree... I will just sit back and munch some popcorn while that sinks in

sources-

https://www.uni-ulm.de/fileadmin/website_uni_ulm/uzwr/mmsm/mmsm1-ws1314/mmsm1-handout-plasticity.pdf

http://www.virginia.edu/bohr/mse209/chapter6.htm

https://www.quora.com/Whats-the-difference-between-ductility-and-elasticity

https://engineering.stackexchange.com/questions/15682/work-hardening

 

[F. Guffey]

Yes. Time changes things, though the aged military ammo Hummer70 pulled at 600 pounds was crimped.

Time as a factor, distance as a factor. And pulling a bullet with a crimp and getting a reading of 600 pounds? They decided it was 'cold welding' and I wondered if they held the case by the rim or held the case at the shoulder? And I wonder if all of that strain stretched the case as increasing the distance from the datum/shoulder to the case head.

And there is always a chance when the case is held by the rim with a shell holder and or extractor the rim is damaged when the case locks up in a die and or chamber.

And then there is removing the bullets by firing.

F. Guffey