In simpler words, beating the crap out of a knife with a sledgehammer till it breaks doesn't really prove anything but that you can break a knife with a hammer.
Actually, the
when and
how are quite demonstrative, sort of like breaking a 1" branch over my knee vs. doing the same to a 2" branch, or even a 4" branch - the effort required and the time as well are both notably important factors regarding specific durability of the selected objects. In my line of work, I can chew up any sort of mammalian cell via treatment with Trypsin, but some cells are more resistant - it takes longer to destroy them or requires more/harsher manipulation, information that is
key to my research. But that has little to do with "credibility".
FYI: This subject has been exhaustively debated on BF. Do a search and set aside half a day to go through the threads.
Most of those threads got tossed, and many others resulted in flame-wars by psuedo/wannabe science-officianados making ridiculous pronouncements against the "tester" while supplying severely flawed criticisms of his method

. I've yet to come across a thread which made a scientifically valid argument against the "credibility" of the demonstrations, just general method-complaints. Peoples' interpretations of the 'results' might lack credibility (or rather rational justification), but the videos themselves??
So I still don't get the hate... *shrug*
Recently,
effer was quite conversational and I managed a few pages of analyses after the Bravo1 post to flush-out his concerns regarding the method -
http://www.bladeforums.com/forums/showthread.php?t=782282 - our 1st contributions start at post #16.
Personally, I think the D-test is pointless. Interesting, yes, but highly unnecessary. I've pushed my Bussekin blades pretty hard to well beyond "normal knife use" with no failures and I doubt that will ever change.
I think this statement (based on what follows it) would be more correctly (honestly) phrased thus:
"For me the D-test is pointless. Interesting, yes, but highly unnecessary."
That "For me" is key - it presents subjectivity, the "I don't need to know what the stress limits of my tool are via limit-testing, such information is not important to me." :thumbup: Indeed, it isn't important to a lot of people... but it
is interesting, and it is indeed important to some people, including people who would benefit greatly from Bussekin knives if they were aware of their capabilities or might suffer when some other hyped tool fails them. *shrug* To each his own, no?
Any of you that think you are going to find a practical & necessary use that will break a .187" thick blade will be hard pressed to realistically do so with any kind of rationally justified explanation.
Join the Army

(although maybe that automatically discounts "rationally justified explanation"?

) But seriously, some people don't trust less than 0.20" for a "hard-use" knife, maybe because they haven't seen the capabilities of a thinner/lighter knife from better steel or a better maker. Limit-testing is a way to demonstrate those capabilities :thumbup:
Now what I would like to see is an AK47 custom ground down to the same length as a Waki, then given identical edge geometry in order to conduct a fairly scientific edge on edge test of INFI vs SR101 swords.
It could finally settle some questions about the two steels AND be an interesting demonstration of a realistic potential hard use for them. A simulated Bussekin sword fight!...

While I'd enjoy watching ANY bussekin sword-fight video :thumbup: (however 'realistic' the use may or may not be), you'd be pretty hard-pressed to conduct
any even
minimally 'scientific' edge-on-edge test to compare steels. For cutting tests, you're much better off using both blades to cut the same medium.
This needn't carry on, but I would like to see some videos of Rats being limit/D-tested since Cliff Stamp's reviews are long gone, few included destruction limits, and none included video... I miss cutleryscience.com.