Speaker
Description
Bonded CFRP structures offer advantages over conventionally manufactured structures due to their potential processing speeds, pre-equipment capabilities, reparability, and maintenance friendliness. Fundamentally, an as-yet untapped potential lies in the ability for damage-free debonding and rebonding, enabling structural components to be repurposed for new applications at the end of their initial service life, particularly in the context of sustainability.
In this work, we developed and tested an analytical approach for the mathematical description of the debonding process using a wedge effect. Therefore, the bending stress of a simplified beam element is analyzed. Using the safety factor SF under the action of the fracture force, the corresponding maximum bending stress σ_{b,max},max can be determined analytically. Interestingly, the analytical considerations reveal that the calculation of the safety factor SF is entirely independent of the previously considered beam width B and the associated crack length c.
Subsequently, based on this approach, we developed a numerical model employing the Finite Element Method (FEM) and a cohesive zone model (CZM) to demonstrate the applicability and suitability of this method for describing the physical phenomena occurring during damage-free debonding. The results show that this approach enables a physically based description of the damage-free debonding of CFRP structures. This lays a foundational step toward the sustainable disassembly of lightweight structures.
