How to deal with products in circular economy: an approach to model specific design knowledge illustrated at the example of a circular factory for angle grinders

The reprocessing of used products within a circular factory relies on instance-individual design
decisions. This requires specific design knowledge (SDK) on relations between embodiment and functional
behavior. However, existing approaches do not model SDK in a way that supports product reuse to fulfill the
functional requirements of new product generations. This paper presents a hypothesis-based modeling approach on
building and structuring qualitative SDK. Drawing on elements of existing product models, the approach yields
three outcomes - a function-related structure, design hypotheses, and the assignment of testing strategies. A case
study of an angle grinder demonstrates how the approach addresses the requirements of a circular factory by
facilitating targeted SDK buildup, ensuring comprehensive documentation, and preparing the quantification of
knowledge.