The objective of this thesis project is to determine, analyse, and implement the different estimating models commonly used in the automotive field to predict the material behaviour in the post-necking region. An additional objective of this project is to comprehend which are the principal damage models used to predict the fracture initiating point on the material, and how these models are implemented concretely. The automotive world is constantly evolving, not only in the technology sector, but also in the material sector. Particularly, the regulations shifted to an always more increased safety in vehicles components and, most importantly, in the passenger cabin.