Tensile dimensionality is the number of dimensions over a surface that a material has tensile strength. For bulk materials this is two, for fiber composites this is one. When making a spherical tank the effective tensile energy is proportional to the tensile dimensionality. When making a string the effective tensile energy is one.

For modeling purposes, it's assumed that all the tanks are spherical and the combustion chamber is spherical. Tensile dimensionality is used along with reusability, safety factor and tensile energy to calculate effective tensile.

effective tensile = tensile dimensionality * tensile energy / safety factor / ( 1.0 + 0.13 * log( reusability ) )
 
 

This is used in astropolis, pumped rocket and rocket cost.
 
  Rocket