Geometric tunability of interlaminar resistance
Year: 2024
Type: article
Abstract: The inherent weakness in the interlaminar properties of composites and associated delamination poses significant challenges, compromising the performance of composite structures. This study investigates a strategy to increase the apparent interlaminar resistance by altering the geometry of the interface to control crack propagation. We have developed analytical models, which propose a formulation that links the geometry, i.e., the interface width change rate and shape factor of the crack growth plane, with the reaction force-displacement curve. The results obtained, a family of power law relations followed during interlaminar crack growth, indicate that the analytical formulation is valid for all geometries tested, including those with significant width change rates; however, it may not always be easy to use or interpret. An approximated solution, constrained to slowly varying geometries, is also proposed. The limits of using this model are presented and discussed. The final validation of the models is performed using numerical and experimental approaches, considering the delamination of carbon fibre laminates. This work offers new insights into the design of composites and the fracture process in general, featuring unique shapes and improved crack resistance. It also addresses practical issues, e.g., related to composite repairs, which can enhance the performance and longevity of composite structures. Specifically, the proposed formulations can be easily adopted to obtain optimized patch geometries.
Source: Composites Part B Engineering
Authors: Ping Hu, Marcelo A. Dias, Michal K. Budzik
Institution: Aarhus University
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,060
OpenAlex ID: W4402532781