Colloquium: Milan van Dijk (ASM)

13 december 2019 09:30 - Locatie: Lecture Room C, Faculty of Aerospace Engineering, Kluyverweg 1, Delft.

Induction welded unidirectional carbon fiber reinforced thermoplastic L-joints: Joint performance and testing methodology

Induction welding is an effective technique for joining unidirectional carbon fiber reinforced thermoplastic composites and L-joints can be produced through quick and cost-effective processing steps. However, due to high localized stresses in the skin-stiffener interface, these L-joints are often avoided in primary aircraft structures. A method was developed for the implementation of a neat thermoplastic resin fillet between the L-joint skin and stiffener web using the induction welding process, which increased the joint’s pull-off strength. Test results were compared with a similar autoclave co-consolidated joint, which showed that further improvement is possible. An ANSYS Parametric Design Language finite element model was developed based on the virtual crack closure technique to study the influence of various geometric parameters on joint performance. Also, a new test setup was developed, which reduced internal stresses created by the setup compared to those commonly used in literature.