Fatigue behaviour of innovative multifunctional epoxy resins

Pantelakis, Spiros; Polydoropoulou, Panagiota; Katsiropoulos, Ch.V.

doi:10.1111/ffe.12604

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…Among the many potential applications of CNTs, its usage to strengthen polymers has been paid considerable attention due to the exceptional stiffness, excellent strength and the low density of CNT (Guadagno, Naddeo, Raimondo, Barra, Vertuccio, Sorrentino, Binder and Kadlec, 2017; Guadagno, Naddeo, Raimondo, Barra, Vertuccio, Russo, Lafdi, Tucci, Spinelli and Lamberti, 2017). This has provided numerous opportunities for the design of new material systems (Pantelakis et al , 2017) for applications requiring high strength and high modulus (Song et al , 2013; Polydoropoulou, Katsiropoulos and Pantelakis, 2017) and durability (Guadagno et al , 2012; Naddeo et al , 2017). CNTs have exceptionally high Young’s moduli in the Tera Pascal (TPa) range (Treacy et al , 1996).…”

Section: Introductionmentioning

confidence: 99%

Multi-functional nanotechnology integration for aeronautical structures performance enhancement

Viscardi

Arena

Guadagno

et al. 2018

IJSI

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Purpose The purpose of this paper is to evaluate the applicative potentiality of functional/self-responsive materials in aeronautics. In particular, the study aims to experimentally validate the enhancement of structural performances of carbon fibers samples in the presence of nanofillers, as multi-walled carbon nanontubes or microcapsules for the self-healing functionality. Design/methodology/approach The paper opted for a mechanical study. Experimental static and dynamic tests on “blank” and modified formulations were performed in order to estimate both strength and damping parameters. A cantilever beam test set-up has been proposed. As a parallel activity, a numerical FE approach has been introduced to assess the correct modeling of the system. Findings The paper provides practical and empirical insights about how self-responsive materials react to mechanical solicitations. It suggests that reinforcing a sample positively affects the samples properties since they, de facto, improve the global structural performance. This work highlights that the addition of carbon nanotubes strongly improves the mechanical properties with a simultaneous slight enhancement in the damping performance. Damping properties are, instead, strongly enhanced by the addition of self-healing components. A balanced combination of both fillers could be adopted to increase electrical conductivity and to improve global performance in damping and auto-repairing properties. Practical implications The paper includes implications for the use of lightweight composite materials in aeronautics. Originality/value This paper fulfills an identified need to study new lightweight self-responsive smart materials for aeronautical structural application.

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Section: Introductionmentioning

confidence: 99%

Multi-functional nanotechnology integration for aeronautical structures performance enhancement

Viscardi

Arena

Guadagno

et al. 2018

IJSI

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“…As far as the interlaminar fracture toughness is concerned, the results showed a recovery of more than 150 percent. Moreover, a number of studies about improved mechanical properties by incorporating carbon nanotubes have been conducted (Thostenson and Chou, 2006;Kadlec, Hron and Guadagno, 2016;Guadagno et al, 2017;Kadlec, Nováková, et al, 2016;Pantelakis et al, 2017;Polydoropoulou et al, 2016). Specifically, Guadagno et al (2017) investigated a self-healing mechanism based on the creation of reversible hydrogen bonds.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of aeronautical composites containing self-healing microcapsules

Polydoropoulou

Katsiropoulos

Loukopoulos

et al. 2018

IJSI

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Purpose Over the last decades, self-healing materials based on polymers are attracting increasing interest due to their potential for detecting and “autonomically” healing damage. The use of embedded self-healing microcapsules represents one of the most popular self-healing concepts. Yet, extensive investigations are still needed to convince on the efficiency of the above concept. The paper aims to discuss these issues. Design/methodology/approach In the present work, the effect of embedded self-healing microcapsules on the ILSS behavior of carbon fiber reinforced composite materials has been studied. Moreover, the self-healing efficiency has been assessed. The results of the mechanical tests were discussed supported by scanning electron microscope (SEM) as well as by Attenuated Total Reflection–Fourier-transform infrared spectroscopy (ATR–FTIR) analyses. Findings The results indicate a general trend of a degraded mechanical behavior of the enhanced materials, as the microcapsules exhibit a non-uniform dispersion and form agglomerations which act as internal defects. A remarkable value of the self-healing efficiency has been found for materials with limited damage, e.g. matrix micro-cracks. However, for significant damage, in terms of large matrix cracks and delaminations as well as fiber breakages, the self-healing efficiency is limited. Originality/value The results obtained by SEM analysis as well as by ATR–FTIR spectroscopy constitute a strong indication that the self-healing mechanism has been activated. However, further investigation should be conducted in order to provide definite evidence.

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“…The agglomerated particles act as local stress concentration sites in the microstructure of the adhesive, and consequently, they are the potential locations for crack initiation. According to the literature, 11,13,23,34,49–51 agglomeration of nanoparticles can typically degrade the mechanical properties of resins/adhesives reinforced by higher additive contents. As depicted in Figure 7B, many air bubbles were created during the mechanical stirring, and correspondingly, cracks initiated from the edge of air bubble cavities.…”

Section: Resultsmentioning

confidence: 99%

On the static and fatigue life of nano‐reinforced Al‐GFRP bonded joints under different dispersion treatments

Zamani

Alaei

Silva

et al. 2022

Fatigue Fract Eng Mat Struct

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As bonded components of engineering structures inevitably experience fatigue loading conditions during their service life, it is significant to find ways to enhance their endurance. Also, adding nanoparticles to the adhesive can be introduced as an approach to design more durable bonded joints. In this way, it is important to determine a nanoparticle dispersion method which can lead to the longest fatigue life. Accordingly, this paper aims to investigate the influence of various nanoparticle dispersion treatments on static and fatigue responses of aluminum‐to‐composite bonded joints under four‐point bending. For this purpose, four dispersion techniques of mechanical stirring, bath‐sonication, low‐power and high‐power probe‐sonication were used to disperse nanoparticles into the adhesive. Also, four specimen groups of neat (with no additive particles), graphene nano platelet (GNP)‐reinforced, nano silica‐reinforced, and hybrid‐reinforced (including GNP + nano silica) were prepared. Results indicated that, for the joints including GNPs, the longest fatigue life was achieved for the specimens prepared by low‐power sonication method, while for hybrid‐type reinforcements, using high‐power method led to the highest endurance. Moreover, for 0.5 and 1.0 wt.% of nano silica, the endurance of bath‐sonicated specimens was 12.77% and 9.28% longer than low and high‐power probe‐sonicated joints, respectively. Using the backface strain (BFS) measurement technique, the influence of dispersion methods was studied on extending the crack initiation life (CIL) of each joint group. It was revealed that, for 0.5 wt.% and 1.0 wt.% of nano silica, the CIL is independent of the dispersion method, while, for 1.5 wt.%, probe sonicated specimens had the longest CIL. The microstructural characterization of each dispersion method and major reinforcing mechanisms were interpreted by scanning electron microscopy (SEM). For future researches, using X‐ray tomography and health monitoring methods is recommended to detect size and location of damage for nanoparticle reinforced composite structures.

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Fatigue behaviour of innovative multifunctional epoxy resins

Cited by 7 publications

References 19 publications

Multi-functional nanotechnology integration for aeronautical structures performance enhancement

Multi-functional nanotechnology integration for aeronautical structures performance enhancement

Mechanical behavior of aeronautical composites containing self-healing microcapsules

On the static and fatigue life of nano‐reinforced Al‐GFRP bonded joints under different dispersion treatments

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