Consider a structural beam subject to a loading that results in the following stress condition. There is no lateral bending.

${}_{xy}=\frac{V+(3(h^2-4y^2))}{26h^3}$

${}_{}=\frac{12My}{6h^3}$

$b=8$;$h=12$;$M=7000$;$V=3000$

Use Excel to determine the maximum principal normal stress and the location by calculating the principal normal stresses at a number of values for y which is less than or equal to $0$ and h$/2.$