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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Poster II
CPP 21.4: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster E
Mechanical Response of Carbon Fiber Reinforced Epoxy Composite Parts Joined with Varying Bonding Techniques for Aerospace Applications — •Furkan Karaboğa1, Yahya Öz1, Erdem Yunus2, and Fatih Göleç2 — 1Turkish Aerospace, Ankara, Turkey — 2Bursa Technical University, Bursa, Turkey
Due to the widespread usage of composite materials in aerospace structures, the significance of composite joining methods has been increased. In this research, the impact of various joining techniques on the strength of composite joints through experimental, numerical and analytical analyses is investigated. The study compares the single lap joint shear strengths of carbon fiber reinforced epoxy composites, which are assembled using fastening with pop rivets and solid rivets, secondary bonding, co-curing and co-bonding methods. Additionally, the influence of adhesive thicknesses (from 0.2 to 0.76 mm) for secondary bonding, adhesive film existance for co-bonding and overlapping distance for co-curing on single lap shear strength is explored. Following the production of samples employing different joining methods, tests were conducted according to ASTM 5868. Furthermore, the interface damage in composites was analyzed by using a scanning electron microscope aiming to understand the damage mechanism. Evaluation of fracture mechanisms associated with bonding methods was performed by inspecting the fracture surface of composite samples. The obtained results were also analyzed numerically using software tools. The highest strength is obtained as approximately 25 MPa which deviates only 3 % from the numerical results.
Keywords: Composite joining; Co-bonding; Co-curing; Fastening; Single lap shear strength