TMA1 wrote:Agreed. They arent magicians. The length of the apfsds and the speeds discussed can only infer a pen of about maybe 800mm RHA. seen a lot of tests using relatively modern computer programs showing apfsds penetration depths on yt. Thry are neat, but I have yet to see an enterprising lad use one of these programs in combination with the latest we know in tank armor. Im talking the steels, ceramics and fibres in the right places and in the right configurations. This might be hard to program into the software though as things like ceramic composite matrices are complex structures and I dont think many of the programs seen on yt are capable of rendering such complicated objects. I bet that kind of software is only seen on a university or government level. I do wonder if these kinds of structures greatly reduce penetration. It used to be that generally penetration stayed the same even with newer armor, it just lowered weight in the tank. Now though with rumors we hear for example in the Armata, with CCM and other materials, I wonder if it isnt just weight reduction but also penetration reduction as aell.
I will say one thing though that America does seem to have more advanced sabots for their darts. Arent they made mostly of carbon fibre? Also with a lighter sabot does it bring greater efficiency? I think it might but since Russia has gotten their longinus to speeds up around 2000 meters a second, this might not matter anyways.
Edit:added some thoughts.
You know what they say about computers: garbage in equals garbage out. Any simulation is only reflecting the limited set of assumptions and parameterizations of
physical processes. This does not mean it is a waste of time, but it is not proof of much if there are factors that produce leading order effects that are ignored.
Software here is custom models composed by researchers and nothing off the shelf. I know there are fluid dynamics packages from vendors such as Fluent. But
if you want to solve custom problems, then you write custom code. To produce parameterizations you need empirical data from field testing and laboratory
measurements. Youtube fanbois are not going to be lifelong researchers in materials science.
Heterogeneous materials are challenging to model. But with the right set of properties they can deliver much in terms of function. I am sure there is an endless
search for such useful characteristics and that any advances are top secret.
The material of sabot darts is chosen to be stiffer than the nominal target armour which is assumed to be metal. There are high speed videos showing what
happens to a bullet when it hits bullet-proof glass and it basically spreads like a liquid drop hitting the pavement. The glass is not as malleable as metal so the
metal ends up yielding and the impact energy goes into its deformation. The trick is for the more brittle glass not to shatter and fail in this manner. Once you
get into composite materials, the armour is no longer a malleable metal and the carbon fiber sabot dart does not have the advantage it had before.