Contact of two cylinders with their axes parallel to the y-coordinate:

In the context of adhesion of two elastic bodies or one elastic body with a rigid one, the work of adhesion , so that work of adhesion is expressed as,

	(10.19)

Rearrangement of this equation and substitution of , per unit length of the contact load is obtained as,

	(10.20)

Hence putting, , the measured contact load is estimated as,

	(10.21)

Rearranging the above equation, we obtain,

	(10.22)

The work of adhesion between two surfaces is estimated using equation 10.22. Notice that, while we deduced earlier a similar relation for adhesion between spheres using the energy approach, we obtain equation 10.22 following fracture mechanics route.