The thesis introduces novel techniques for the three-dimensional placement of CFRP-Tows inside prefabricated plywood plates to create fibrous bending resistant timber plate joints. Their density, orientation, and position can be adapted to the calculated local forces in a segmented hybrid timber shell. Initial structural tests of the joints show promising results; especially their bending capacity seems hard to match with other parametric joining techniques.
Any dihedral plate angles between 90 and 180° can be achieved which allows for gradual integration of various functional and structural aspects into segmented timber shells. Active CFRP rigidization via Internal Resistive Heating is used to cure the Fiber Tows after they are placed inside the wood. This opens up the possibility of mobile on-site joining of large-scale structures with CFRP Tows independent of autoclave sizes. Finally, yet importantly, the joints’ structural capacity purely depends on the form-stability of the CFRP loops rather than any chemical interface. The CFRP parts can therefore be easily removed from the wood for disassembly, separation, and recycling of the used materials.
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ITECH M.Sc. Thesis Project 2017: Fibrous Augmentation - Three dimensional fibre arrangements in hybrid timber shells
Dominga Garufi, Hans Jakob Wagner
Thesis Advisers: Tobias Schwinn, Dylan Wood, Simon Bechert
Thesis Supervisor: Prof. Achim Menges
Second Supervisor: Prof. Jan Knippers