Materials Database

AR500 Steel

Type	Carbon Steel
Modulus of Elasticity	30 x 10^6 psi
Poisson's Ratio	0.29
Density	0.29 lb/in^3
Ultimate Tensile Strength	225 ksi
Tensile Yield Strength	200 ksi
Brinell Hardness	450 HB
Rockwell Hardness	C48
Elongation at Break	12%
Familiar Sellers	McMaster Carr, MakeItRingTargets, Alro Steel, SendCutSend

Material Description:

High strength, ultra wear resistant steel used in body armor and shooting targets
Hardened steel is difficult to machine, is typically only used for Waterjet parts
Typically used for weapons due to it's high strength, toughness, and relatively high hardness
Anecdotal experience from builders says that AR500 typically bends before it fractures

Type	Aluminum Alloy
Modulus of Elasticity	10^7 psi
Shear Modulus	3800 ksi
Poisson's Ratio	0.33
Density	0.0984 lb/in^3
Ultimate Tensile Strength	45 ksi
Tensile Yield Strength	39 ksi
Fracture Toughness	26.4 ksi-in½
Brinell Hardness	93 HB
Rockwell Hardness	B52
Elongation at Break	10%
Machinability (Vs. 1112 Steel)	270%
Familiar Sellers	McMaster Carr, Midwest Steel Supply, SendCutSend

Material Description:

Lightweight aluminum alloy that comes already pre-heat-treated T6 temper which gives it its strength
Beware of tempers T4 and O which are weaker than 6061-T6
Typically used for frame rails, plates, pulleys, and armor for some bots
Tends to fail in bending before fracturing
Tends to "ablate" and may take gashes when hit directly by weapons
Easy to machine