Herttzian Mechanics (contd...)
A similar expression can be written for the second surface:
The separation between the two surfaces is given as .
We can now transpose equation 8.1 to a common set of axes and ,
In which after suitable choice of axes, vanishes, leaving
Where , are constants and , are principal relative radius of curvature.
If the axes of the principal curvature of each surface, i.e. the and are inclined to each other by an angle , then it can be shown that
and
. 
and 
,
vanishes, leaving 
, 
are constants and 
, 
are principal relative radius of curvature. 
and 
are inclined to each other by an angle 
, then it can be shown that 
