The design of fibre composite parts spans across various design phases, starting with requirements collection and decomposition, going on with geometry definition, mechanical calculations, optimization of fibre arrangements, production planning and so on and ending with manufacturing. Typically, changes in one design phase may affect all subsequent phases or even affect the entire design process. Graph-based design languages (GBDLs) offer a unified and consistent digital data model capable to store and propagate relationships of design objects via linked graph nodes, thereby expressing the different mutual dependencies for design modifications within the model. By defining the contents of the knowledge domains in a vocabulary, rules and a rule sequence, the entire design process can be described and executed automatically. This paper shows how GBDLs can be applied to the design process of fibre composite parts by using them to automatically generate a FEM simulation for a given geometry and then using the result to model and plan the production sequence for the created composite part.