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Interleaving CFRP and GFRP with a Thermoplastic Ionomer: The Effect on Bending Properties

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Abstract

Carbon and glass fiber reinforced polymers are employed in a variety of structural applications that require high stiffness and lightweight composites. However, poor through thickness properties make these laminates susceptible to delamination, usually caused by low energy impact. Interleaving these composites with a thermoplastic material has the potential to reduce the risk of delamination. Here we prepared preforms of dry textiles with a thin ionomeric layer melted on the mid plane, followed by resin infusion. Interleaved GFRP had its flexural toughness improved in 95.5% and its charpy impact strength increased in 23%. On the other hand, CFRP presented a reduction in 10% on flexural toughness and no improving in impact strength due to poor adhesion between CF and the ionomer, as confirmed by SEM images. Nonetheless, both interleaved systems showed an increase in damping observed by a reduction of 30% on Tanδ peak in DMA tests.

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Acknowledgement

CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico)-Brazil, under grant 140249/2017-6, is gratefully acknowledge for the PhD scholarship.

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Authors and Affiliations

  1. Department of Materials Engineering, Sao Carlos School of Engineering, University of São Paulo (SMM-EESC-USP Av. João Dagnone, São Carlos, SP, 1100, 13563-120, Brazil

    Gustavo de Souza & José Ricardo Tarpani

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  1. Gustavo de Souza
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  2. José Ricardo Tarpani
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Correspondence to Gustavo de Souza.

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Highlights

• Thermoplastic ionomer film was used as midplane interlayer for CFRP and GFRP

• Ionomeric films were melted between the dry preforms before resin infusion

• Different mechanical behavior was observed depending on the reinforcement phase

• Interleaved GFRP presented an increase in 95% on flexural fracture toughness

• Interleaved CFRP presented reduction of in 10% on flexural fracture toughness

• Both interleaved composite systems presented an increasing in damping

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de Souza, G., Tarpani, J.R. Interleaving CFRP and GFRP with a Thermoplastic Ionomer: The Effect on Bending Properties. Appl Compos Mater 28, 559–572 (2021). https://doi.org/10.1007/s10443-021-09874-2

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  • DOI: https://doi.org/10.1007/s10443-021-09874-2

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