VX AND VZ CURVES ON FLINN DIAGRAM
Flinn also gave two parameters Vx and Vz (x and z are actually
superscripts) given by two equations at the bottom of the figure. Because
these are tan functions, the curves can only be drawn for angles that are
greater than 45 degrees; the point of origin being (1,1) for undeformed
material and not (0,0). Vx=tan^-1(x/y) where x=a^2(b^2-1) and y=a^2-1 Vz=tan^-1(x'/y') where x'=b^2(a^2-1) and y'=b^2-1
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