Analysis of the damage mechanisms of adhesively bonded thin tow-based discontinuous composites

Abstract

Tow-Based Discontinuous Composites are a new class of composite materials which combine high strength and stiffness with in-plane isotropy and therefore have the potential to be used in high-end structural applications. However, an efficient connection method for TBDC components is currently lacking as bolted joints introduce defects and stress concentrations. On the other hand, adhesive joints are an unproven method especially considering the complicated micro-architecture of TBDCs. This work seeks to explore the quasi-static performance of TBDC adhesive joints under different loading conditions. Double Cantilever Beam (DCB) and Single Lap Joint (SLJ) testing is performed using a moderate and a high toughness adhesive. The global joint response was analysed while Acoustic Emission (AE) was utilised to identify and characterise the different damage mechanisms experienced by the joints. Finally, fractography was also utilised to detect damage mechanisms in the fracture surfaces and validate the AE findings.

Rosemere de Araujo Alves Lima

Postdoc Researcher

I am an MSCA postdoctoral researcher working on toughening and self-sensing strategies for smart, reversible adhesive joints. My research combines 3D printing, structural health monitoring, and multifunctional materials to enable the development of next-generation circular adhesively bonded composite structures.

Sofia Teixeira de Freitas

Principal Investigator

Sofia Teixeira de Freitas researches the structural integrity of bonded and layered materials to enable durable, sustainable structures. She is also an accredited group facilitator, committed to building academic environments grounded in cooperation and inclusion—key to overcoming technological limits and addressing the challenges of a truly sustainable society.