On the Mode I Fracture Toughness of Metal-Composite Joints with untreated SLM 3D-Printed Ti6Al4V Substrates

Conference paper (2024)

Authors

Michele Gulino University of Parma
Rosemere de Araujo Alves Lima Group Teixeira De Freitas - Aerospace Engineering
Fabrizio Moroni University of Parma
Alessandro Pirondi University of Parma
S. Teixeira De Freitas Group Teixeira De Freitas - Aerospace Engineering , Universidade de Lisboa
Research Group
Group Teixeira De Freitas (Aerospace Engineering) (TU Delft)
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Published Date

2024

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Group Teixeira De Freitas

Abstract

Here we investigate the adhesive properties of Selective Laser Melted (SLM) titanium surfaces in metal-composite cobonded joints without any prior surface treatment, to explore the inherent surface roughness of SLM parts to potentially create strong adhesive bonds. Double Cantilever Beam (DCB) tests were carried out to assess the joints mode I fracture toughness involving untreated SLM titanium and woven Carbon Fibre Reinforced Polymer (CFRP) adherends, co-bonded with an epoxy film adhesive. The same type of DCB joints, but now with sandblasted SLM titanium adherends, were tested to compare the adhesion strength of the untreated SLM surface versus the sandblasted surface. The findings reveal that joints with untreated SLM titanium adherends exhibit similar toughness to those with sandblasted SLM titanium adherends, indicating that the surface morphology of as-printed SLM titanium is suitable for manufacturing robust adhesive joints. The elimination of the surface treatment in the manufacturing of adhesive joints with SLM adherends could increase the interest of many industrial fields towards the use of adhesive bonding over other joining techniques.