PounderPress - An Instron UTS Update

[@joelowrey1535]

It was a pleasure working with Don Lutter for this project and providing an Instron Model 5944 Universal Test System to conduct the testing. It was fascinating to see the load vs displacement data & graph for pressing a bullet into the casing and them extracting it.

[@dinoc.5537]

Very nice demonstration Don. Was the tensile sample left assembled for very long? I'm wondering if the concepts of aggressive neck cleaning and bonding cause a large effect, or if the 5% difference was just due to other effects and dispersion? I think that would make an excellent research topic to go along with annealing.

[@PounderLabs]

Dino C… Thank you for your thoughtful feedback. The turnaround from seating to extracting on the sample was about an hour. You have the time, would be interested in your feedback on our PounderBath PART 1 presentation where we talk about baselining. Our strategy is to use ultrasonic cleaning to bring the brass back, as close as possible, to as-new condition. Our goal is to take the combustion products, as well as, other impurities out of the equation so we can go from the baseline and, as appropriate, examine coatings and other treatments for the neck. We're excited about looking at the tribology of this and agree adhesion needs to be part of that discussion. Don't know if the difference between seating and extraction values are engineering-based or just statistical with such a limited sample size. We had limited time and this was our first blush... definitely this needs to be looked at more closely.

[@dinoc.5537]

Don, I watched all the installments and think the baseline concept is good for that first comparison to see if annealed 1x is the same as virgin 0X brass. Later on, you can add those other effects like the risks of bonding due to scrubbing the necks or storage time. Another good one will be to carry on with cycles on one population without annealing and carry on cycles with another that uses your annealing baseline.