Laser-based plastic-metal-joining with self-organizing microstructures considering different load directions
Innovative multi-material lightweight construction enables reducing dead weight while maintaining and preferably boosting the components' performance. The implementation of multi-material parts (e.g., plastic-metal-components) requires reliable joining processes since a direct connection betwee...
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Veröffentlicht in: | Journal of laser applications 2018-08, Vol.30 (3) |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Innovative multi-material lightweight construction enables reducing dead weight while
maintaining and preferably boosting the components' performance. The implementation of
multi-material parts (e.g., plastic-metal-components) requires reliable joining processes
since a direct connection between these materials is not feasible due to their different
physical and chemical properties. In order to avoid additional weight through adhesive
bonding, riveting or fasteners, thermal direct joining with a modified metal surface is a
promising approach. Within a first process step, the metal surface is modified by
laser-microstructuring. To enlarge the boundary surface and create undercut structures,
random self-organizing micro- and nanostructures are generated with ultrashort pulsed
laser radiation on stainless steel samples. In the subsequent direct thermal joining
process, both joining partners are clamped together. The metal is heated up with diode
laser radiation, and through heat conduction, the polymer melts and flows into the
generated cavities. After cooling-down, a firm joint between both materials is created,
which is based on mechanical interlocking and increased specific adhesion between the
joining partners. The mechanical strength of the joint depends strongly on the load
direction. In the presented contribution, the strength of the joint between stainless
steel and glass-fiber-reinforced and non-reinforced thermoplastics (PP) is investigated
for three different load directions (tensile shear, tensile and peel). |
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ISSN: | 1042-346X 1938-1387 |
DOI: | 10.2351/1.5040616 |