In this study, a comprehensive numerical-mathematical correlation analysis between experimental results obtained on carbon fibre Sheet Moulding Compound specimens and numerical models is presented. The correlation process was carried out in two different phases: First, the specimens without defects were simulated by shell modelling, followed by checking the correlation of the experimental results with the numerical model. Subsequently, the shell models were converted into continuum shell structures, which led to a more accurate modelling required for the next defects simulation. In fact, after completing the correlation between the shell and continuum shell models, defects were incorporated, and the analysis was performed to evaluate the degradation of the properties compared to real specimens. The results obtained provide an in-depth understanding of the relationship between structural properties predicted by numerical models and the actual conditions of specimens, allowing for refined process optimisation and improved prediction of carbon fibre Sheet Moulding Compound component performance.