Improving bonding strength of injection overmolded composites

Akpınar, Serkan and Metin, Merve and Koçoğlu, Hürol and Kodal, Mehmet and Sezen, Meltem and Özkoç, Güralp and Altan, M. Cengiz (2022) Improving bonding strength of injection overmolded composites. Polymer Engineering and Science, 62 (10). pp. 3206-3217. ISSN 0032-3888 (Print) 1548-2634 (Online)

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The overmolding of short fiber reinforced polymer compounds onto continuous fiber reinforced composite substrates provides design flexibility and the ability to tailor stiffness, strength, and damage tolerance for structural applications. In this work, a novel molding approach that enhances the bonding strength by mechanical interlocking is presented. The effectiveness of the proposed approach was validated by characterization of the bonding strength between a short glass fiber PP (SGFPP) composite overmolded onto a continuous glass fiber reinforced PP (CGFRPP) prepreg. Enhancement of the bonding strength was achieved by judiciously drilling tapered holes on the CGFRPP substrate before molding, which facilitated better interlocking with the injection molded SGFPP composite. The overmolding of preheated composites with tapered holes yielded up to 60% improvement in bonding strength. In general, having multiple holes helped improve bonding up to certain hole diameter. Similarly, preheating of the substrate over a short time improved the interfacial adhesion, while extended preheating resulted in a reduction of bonding quality. SEM analysis of the fracture surfaces after the tensile debonding test revealed that the SGFPP filled the holes on the substrate during overmolding.
Item Type: Article
Uncontrolled Keywords: bonding strength; injection molding; mechanical properties; short-fiber composites
Divisions: Sabancı University Nanotechnology Research and Application Center
Depositing User: Meltem Sezen
Date Deposited: 07 Sep 2023 13:31
Last Modified: 07 Sep 2023 13:31

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