The curvature of the roll barrel affects the way the roll bends and interacts with the strip. By
grinding different profiles on the roll barrel, it is possible to change many aspects of the rolling
process.
The roll composition and material also affects the rolling process. The stiffer the roll, the less it
deforms. Rolls can be either solid or composite, such that the barrel has a thin layer on the outside
which has different material properties than the core. Figure 1.8 shows the division of the roll
into shell and core. Rolls are commonly made of steel which can be modeled by a linear elastic
isotropic material represented by an elastic modulus E and Poisson’s ratio