How does armor mechanic work?

[Shurp]

My skill 19 smith manufactured several armor vests with a sharp armor rating of 102%.  Does this mean that they'll heal when they get shot in the torso?

[Wex]

No, it becomes deflection chanche.
It's a roll to avoid the damage entierely, and I guess it starts before 100%, so you will still get damaged.

[FalconBR]

Explain to me what is deflection damage!
Better to explain the complete math because I am using:
On the torso:
Devilstrand duster (50% cutting)
Cotton Button down shirt (10% cutting)
Armor vest (something like 60%)

And I still take like 10 points of damage from charge rifles to the chest!

[FalconBR]

I took a peek at the code, here's what I found out:

Damage reduction from different pieces of apparel does stack, kinda. The calculation is performed separately for each part, so while the effect do stack, there's a difference between having one super-strong armor and more weaker armor pieces.

Armor rating up to 50% reduces damage dealt directly. Anything above 50% reduction instead provides chance to resist the hit completely. Above 100% armor rating, both damage reduction and chance to resist the hit increase, but only at quarter the normal rate. Both damage reduction and chance to resist are capped at 90%. All damage blocked is applied to the armour.

To give an example: B0rsuk's superior power armour has 84% sharp armor rating. A pawn wearing this armour gets shot in the torso. The armour reduces damage by 50% and also gives 34% chance for no damage.

If he were to instead give the pawn a superior hyperweave shirt (31.2% sharp armor) and a superior hyperweave duster (52% sharp armour), the pawn only takes 50% * 68.8% = 34.4% damage from the shot, but also has only 2% chance to avoid the hit entirely. If you add a normal armour vest in, the shot would deal 50% * 50% * 68.8% = 17.2% damage with additional 12% chance to resist entirely.

Just used the search tool and found the awnser!

[GarettZriwin]

Too lazy to dig, but heres the basic idea of armor:
Depending on armor protection value armor will soften attacks and, above certain point it will take damage entirely.

That point was somewhere around 30-50%. If armor have more than that then any additional % is chance to entirely take damage by armor. So 102% armor wouds be 72% to take damage entirely and 28% to soften it if we assume 30% is "soft armor" treshold.