# Some common calculation formulas of spring

In the formula, the unit of length is meter, the unit of area is square meter, and the other units are millimeter
Elasticity: F = k * x
Elastic potential energy: EP = k * x ^ 2 / 2
Weight of round brass bar (kg) = 0.00668 × diameter × diameter × length
Weight of round aluminum bar (kg) = 0.0022 × diameter × diameter × length
Weight of square copper bar (kg) = 0.0089 × side width × side width × length
Weight of square brass bar (kg) = 0.0085 × side width × side width × length
Square aluminum bar weight (kg) = 0.0028 × side width × side width × length
Weight of hexagonal copper bar (kg) = 0.0077 × width across sides × width across sides × length
Weight of hexagonal brass bar (kg) = 0.00736 × side width × opposite side width × length
Weight of hexagonal aluminum bar (kg) = 0.00242 × width across sides × width across sides × length
Weight of copper plate (kg) = 0.0089 × thickness × width × length
(width × length) = 0.008kg × length
Weight of aluminum plate (kg) = 0.00171 × thickness × width × length
Weight of round copper tube (kg) = 0.028 × wall thickness × (outer diameter wall thickness) × length
Weight of round brass tube (kg) = 0.0267 × wall thickness × (outer diameter wall thickness) × length
Weight of round aluminum tube (kg) = 0.00879 × wall thickness × (outer diameter wall thickness) × length
Round steel weight (kg) = 0.00617 × diameter × diameter × length
Weight of square steel (kg) = 0.00785 × side width × side width × length
Weight of hexagonal angle steel (kg) = 0.0068 × width of opposite side × width of opposite side × length
Octagonal steel weight (kg) = 0.0065 × width across sides × width across sides × length
Weight of rebar (kg) = 0.00617 × calculated diameter × calculated diameter × length
Weight of angle steel (kg) = 0.00785 × (side width + side width thickness) × side thickness × length
Weight of flat steel (kg) = 0.00785 × thickness × width × length
Weight of steel pipe (kg) = 0.02466 × wall thickness × (outer diameter wall thickness) × length
Weight of steel plate (kg) = 7.85 × thickness × area
Weight of round copper bar (kg) = 0.00698 × diameter × diameter × length