Single-lap dissimilar joints between AA6061/SiC/20p and hybrid thermoplastic composites: In-plane impact strength and elastic energy during quasi-static indentation process

Proceedings of ‏The 7th International Conference on Modern Approaches in Science, Technology & Engineering

Year: 2021

DOI:

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Single-lap dissimilar joints between AA6061/SiC/20p and hybrid thermoplastic composites: In-plane impact strength and elastic energy during quasi-static indentation process

Nahit Öztoprak, Çınar Emine Yeni

 

ABSTRACT: 

Direct (adhesive-free) adhesion techniques have been drawing more attention to join dissimilar materials in recent years. The goal of this research is to gain a better understanding on the mechanical properties of directly-bonded dissimilar joints between hybrid polypropylene (PP) composites and SiCp/AA6061. Two different hybrid composites reinforced with aramid fabric are considered in the study. One layer of aramid fabric is placed to the middle of the 2 mm thick thermoplastic composite (TPC) panels (20 wt.% and 40 wt.% long glass fiber reinforced), separately with a stacking sequence of [TPC-2mm/fabric/TPC-2mm]. Afterwards, single-lap joints (SLJs) are manufactured through a hot pressing process under a specific force and temperature. Quasi-static indentation (QSI) experiments are performed at the overlap region on the TPC to evaluate the absorbed elastic energy during penetration. Moreover, in-plane impact behavior of the joints is studied. The results show that the hybrid adherend with a higher fiber amount provides a superior resistance force in the QSI. Besides, there is a lower elastic energy-displacement slope in the SLJs comprise of hybrid structure with a fewer fiber ratio. It has also been observed that the increasing fiber percent in the PP composite has a positive effect on the in-plane Charpy impact strength.

Keywords: lap-bonded joint, metal-matrix composite, hybrid composite, aramid, mechanical properties.