They'd be huge and strapped to tanks. You'd get two kinds, anti-infantry ones that are long and thin and spin like helicopter blades, then huge fat anti-tank ones used to ram into enemy tanks.

I don't know but this one looks awesome.

Urban warfare would favor smaller, nimbler blades made for thrusting, mirroring the direction that dueling and gentleman's weapons actually did historically take. In theory a ceramic core surrounded by carbon fiber would make for something resilient and light yet able to keep an edge and on top of that avoid metal detectors.

Cavalry sabre levels of fucking shit up would moreso evolve into what amount to efficient chainsaws. The idea is something capable of decapitation even when you don't have the extra momentum of being on a horse.

>>18129
Did you even google? Carbon fiber composite may be shit-tier blademaking material, but it's been done before.
http://www.tactical-life.com/magazines/guns-and-weapons/escort-carbon-fiber-daggers/
Also, I'm aware Wilson Combat made carbon fiber knives at one point.

Adding a ceramic core wouldn't improve it that much. It would at least hold an edge, but that edge would be far too prone to chipping compared to steel for any serious consideration.

>>18132
iirc the British commandos in WWII who used the sykes-fairbairn dagger would purposely dull the edges of that knife. A razor edge was prone to getting embedded in bone while a duller edge would bounce off and continue stab deeper into vital structures.