10-15-2018, 04:04 PM
JASmith Wrote:Stan's concern about strength variations can be at least partly satisfied by doing a hardness test. Hardness and tensile strength of steel are linked.
"Mild" steel only needs a minimum tensile strength. I once saw a set of predictive calculations get invalidated because the vendor used steel that met the minimum strength, but was actually about 50% greater than the nominal strength. We discovered this only by post-mortem trouble shooting. I knew to ask the question because I had seen the problem in copper plates. BTW, a colleague had the insight to ask that earlier question so I learned from him!
The good news is that, by ensuring the test panels are cut from the same plate, comparative tests like the one being done will likely be OK.
If the added security of knowing hardness variations between the plates makes a difference, local machine shops are likely to have testers on site. Testing labs may also be able to do on-site or in-house tests too for a somewhat higher fee. Portable, even pocket-size, testers are available too.
Joe:
Not going to run the test after all. Stan realizes it is a bit too much and way too late.
I am sure that when ever someone gets some of the Serbian ball ammo that they intend on issuing if they go with a Grendel, that they will test it.
I am pretty indifferent towards the whole thing but won't spend money unless I think something can be realized.
LR55