PSI - Issue 66

M. Totaro et al. / Procedia Structural Integrity 66 (2024) 205–211 Author name / Structural Integrity Procedia 00 (2025) 000–000

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Fig. 6 Broken specimens (a) BF (b) GF

4. Conclusions In this study, the mechanical properties and failure mechanisms of BFRC and GFRC were analysed and compared under static tensile tests. BF specimens demonstrated higher overall strength compared to GF specimens. For both materials, the use of IR Thermography allowed clear identification of two main failure events: initially, matrix cracking is the primary damage, followed by fibres breakage. Since both composites used a vinylester resin, they exhibited the same matrix failure mode. However, distinct fibre failure mechanisms were observed.  BFRC exhibits a progressive failure, with initial fibres breakage followed by delamination and debonding mechanisms until the specimen fails.  GFRC undergoes sudden and complete failure, with strong inter-laminar bonding and no layer delamination observed. The results of this work indicate that BFRC offer superior performance compared to GFRC. BF laminates not only demonstrate better mechanical properties, but their more gradual failure behaviour provides significant design advantages, enhancing the safety and lifespan of the structure and allowing for continued use after initial damage. Additionally, BF materials offer benefits in terms of cost-efficiency and environmental sustainability, making them a more versatile and durable option for demanding conditions. Acknowledgements The authors would like to thank the financial supports of Ministry of Economic Development on the resources provided by the Decree 5 March 2018 Chapter III, as part of the project “Development of Ahead Systems and Processes for Highly Advanced Technologies for low Magnetic Signature and Highly efficient Electromagnetic shielded ecofriendly vessel – DAS PHANTOMSHIFFE”, grant number F/190001/01/X44.