Quote Originally Posted by Philipvs Vallindervs Calicvla
You'd think wouldn't you? I'm just repeating what I've read. I think in might have to do with the plates being both large and thin, so they tended to buckle under less pressure. Lorica Segmentata seems to have been a deforming type of armour, actually designed to get busted up in combat, rather than the man wearing it.
It's not like the individual scales in scale armour were exactly thick or tremedously strong either - heck, they were usually copper alloy anyway, if not leather. But the effect taken together was very much more than the sum of its parts.

Case in point would be the type of limb defense the Greeks termed cheir, again. Even in leather versions that was apparently regarded as a very good limb defense - good enough to render a shield unnecessary - in a part of the world crawling with powerful composite bows, heavy javelins, battleaxes, maces, kopis-type chopping swords and similar heavy-duty unpleasantness. Trajan's front-rank legionaires were famously issued with a metal derivative for their sword arms to counter the nasty Geto-Dacian curved blades.

As for deforming, meh. You typically want armour metal to retain a degree of springiness and flexibility, so it flexes and bends and rebounds instead of cracking (one reason why mail links were never of "hard" steel). Combined with the inevitable padding worn under all metal armour - already to keep the stuff from rubbing the soldier's skin off - the overlapping plates ought to be pretty good impact-absorbers, and while strong hits might well cause rather uncomfortable permanent deformation this is in any case rather preferable to getting your guts ventilated and the matter can be fixed in the unavoidable after-battle repairs. I understand a bigger problem was the fragility of the brass hinges and suchlike.