In this lesson, some more models will be discussed which will help to understand the range of models that are available. The models of nonlinear hyperelasticity are discussed further. The example discussed here first is an incompressible neo-Hookean model. This model works well for polymers. Next, the compressible form of the neo-Hookean model is shown. After this, the Quadratic Logarithmic model is discussed. The elasticity tangent is discussed at the end of this lesson.