Steel Fiber

The Steel Fiber mod increases the armor of a warframe by 10% for each rank of the mod.

The mod is common, has a polarity, and has an equal chance to drop from any faction.

Armor Values
Steel Fiber gives additional Armor based on the frame's Base Armor.

The Total Armor can be calculated by the following formula: Total Armor = BaseArmor * (1 + SteelFiberPercent)

Example - 150 Base Armor with 110% Steel Fiber would be calculated as follows: Total Armor = 150 * (1 + 1.10) = 331.5 Total Armor

Damage Mitigation
Damage Mitigation is the amount of damage that is negated by armor, and is calculated as: Armor Mitigation = 100 / (Total Armor + 100) The following table shows the net Damage Mitigation percentage values provided by armor for different key base armors that various frames have. The amount of damage actually received is simply what's left after subtracting this % of the net incoming damage from itself.

Effective Health
Higher armor values can be thought of as increasing your effective health in relation to incoming damage. However, this would only apply to damage types that do not ignore armor. Because "effective health" more literally translates as "the maximum amount of damage you can take", if we simply set your "Total Health" equal to your "Incoming Damage" after Armor Mitigation, and then solve for the Incoming damage alone, we can determine your Effective HP. The proof:

Total Health = Incoming Damage - (Incoming Damage * Armor Mitigation %) Total Health = Incoming Damage * (1 - Armor Mitigation %) Total Health / (1 - Armor Mitigation %) = Incoming Damage The last line being the final formula to calculate Effective HP. As Armor Increases, Effective HP drastically increases as well. Bellow are two tables with examples of how Effective HP increases with armor. All values are rounded to the nearest integer.
 * 1) Factor out Incoming Damage on right side.
 * 2) Divide both sides by (1 - Armor Mitigation %)