1st ICAI 2020

International Conference on Automotive Industry 2020

Mladá Boleslav, Czech Republic

Figure 4: Cross section of metal-plastic joint (HPCi technology, laser pre- treatment of metal) (left); Wetting tests on PLA without (top) / with (bottom) atmospheric pressure plasma (right)

Source: own elaboration 3.2 PLA joining results

3.2.1 Adhesive bonding After surface cleaning and pre-treatment, the test specimen were fabricated using an adhesive thickness of 200 μm. After mechanical testing (test speed: 1 mm/min) the fractured surfaces were analysed. A joint strength of approx. 5 N/mm² was reached (Figure 5). It has been clearly demonstrated that the adhesion between PLA and the adhesive limits the shear strength of the joint. There was no influence of the metal surface pre-treatment observed. Figure 5: Tensile shear strength of adhesive bonded PLA for different pre-treatment processes on the metal side; pre-treatment PLA: Atmospheric pressure plasma (left); breaking surface (right), the thin wire was used to realise constant adhesive thickness

Source: own elaboration

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