Fractional calculus is used to model the behavior of a material called polyvinyl butyral, commonly used in laminated glass. The researchers focused on using fractional viscoelasticity to describe how this material behaves. They looked at a model called the generalized Maxwell model, both in its standard form and in a fractional form, to see how well they fit experimental data. The study suggests that using fractional viscoelasticity is a good way to understand the properties of polyvinyl butyral in laminated glass.