Student Enhanced joining surfaces by laser processing of fiber-reinforced plasticWednesday (24.06.2020) 16:10 - 16:30 Room 2
The properties and processing behavior of fiber reinforced plastic (FRP) is significantly different to metal. Consequently, established pre-treatment processes for metal need to be modified or replaced by new processes to become suitable for FRP. Especially established mechanical process, such as mechanical blasting, damages the surface, irremediable. In contrast to mechanical treatment, the quasi-cold laser processing offers a promising solution in overcoming challenges dealing with surface modification of FRP.
Pulsed lasers are used for surface pre-treatment of fiber-reinforced plastics. The author’s latest investigations demonstrate improved adhesion strength for various joining technologies related to FRP, such as adhesive bonding, coating deposition and injection molding. Using laser pre-treatment, the following results were gained:
For adhesive joining between laser treated FRP and pure plastic, a tensile shear strength of 4 MPa is achieved – five times higher values compared to untreated conditions. Furthermore, the relative standard deviation is significantly reduced.
Moreover, for coating of FRP with a metal wear protection layer (by thermal spraying) a laser structuring of FRP was used to create a durable connection of both materials. A 40 % higher adhesion strength of the interface is achieved compared to pretreatment by sand blasting. [1,2].
In an injection molding process additional rib structures are applied on a laser structured FRP at room temperature. With 11.2 MPa tensile strength more than seven times higher bonding strength is reached, compared to an untreated surface (1.5 MPa). Therefore, this technology is comparable with injection molding on hot substrates. 
Pulsed lasers are used for surface pretreatment of fiber reinforced plastics. The author’s latest investigations demonstrate improved adhesion strength for various joining technologies related to FRP, such as adhesive bonding, injection molding and coating deposition.
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