Fatigue testing and online inspection of carbon textile composites for aeronautical applications

Paepegem, Wim Van

doi:10.1016/b978-1-78242-281-5.00015-8

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…49 On the other hand, the weave pattern in textile FRCs leads to complex damage behavior under cyclic loads. 50 With the increasing use of textile composites in aerospace 51 and wind energy 52 engineering applications, a textile fabric reinforced in a thermoplastic polymer matrix was chosen for this study. The relevant properties of the CF-PEKK material are given in Table 1.…”

Section: Description Of the Composite Materialsmentioning

confidence: 99%

Influence of pulse duration on the fatigue behavior of a carbon‐fiber‐reinforced composite under cyclic three‐point bending at 20 kHz

Premanand,

Balle

2024

Fatigue Fract Eng Mat Struct

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Very high cycle fatigue (VHCF) experiments are limited in practice due to their long testing times. In ultrasonic fatigue test (UFT) systems, the cyclic oscillation is applied using resonance at 20 kHz with a pulse and pause sequence. However, determining optimal pulse durations to achieve minimal testing time and avoid thermal‐induced fatigue damage in fiber‐reinforced polymer composites remains a challenge. In this work, several fatigue experiments, temperature analyses, and digital light optical microscopy were carried out to evaluate the influence of pulse duration on the fatigue behavior of a carbon‐fiber fabric reinforced in polyether‐ketone‐ketone (CF‐PEKK) composite. A shorter pulse duration with the same pulse–pause ratio as the longer pulse duration is proposed for higher stress amplitudes to avoid any thermal influence during mechanical fatigue without altering the underlying fatigue damage mechanisms.

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Section: Description Of the Composite Materialsmentioning

confidence: 99%

Influence of pulse duration on the fatigue behavior of a carbon‐fiber‐reinforced composite under cyclic three‐point bending at 20 kHz

Premanand,

Balle

2024

Fatigue Fract Eng Mat Struct

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“…Reliable designs of structures made out of carbon fabric-reinforced polymers (CFRPs) require an accurate evaluation of their fatigue life under service loading conditions [ 3 ]. Two notable applications for textile composites are aerospace [ 4 ] and wind energy engineering [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending

Premanand,

Prescher,

Rienks

et al. 2024

Polymers

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With ultrasonic fatigue testing (UFT), it is possible to investigate the damage initiation and accumulation from the weakest link of the composite material in the very high cycle fatigue (VHCF) regime in a shorter time frame than conventional fatigue testing. However, the thermal influence on the mechanical fatigue of composites and the scatter in fatigue data for composites under ultrasonic cyclic three-point bending loading still need to be investigated. In this study, we conducted interrupted constant-amplitude fatigue experiments on a carbon-fiber satin-fabric reinforced in poly-ether-ketone-ketone (CF-PEKK) composite material. These experiments were carried out using a UFT system, which operates at a cyclic frequency of 20 kHz with a pulse–pause sequence. Various parameters, such as the CF-PEKK specimen’s surface temperature, acoustic activity, and the ultrasonic generator’s input resonance parameters, were measured during cyclic loading. During experiment interruption, stiffness measurement and volumetric damage characterization in the CF-PEKK specimens using 3D X-ray microscopy (XRM) were performed. The locations of damage initiation and accumulation and their influence on the changes in in situ parameters were characterized. Under fixed loading conditions, damage accumulation occurred at different locations, leading to scattering in fatigue life data. Further, the damage population decreased from the surface to the bulk of the composite material.

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“…Different coating alternatives of carbon steel can be found in the literature: stainless steel [8,9] organic coatings [10,11] ceramic coatings [12,13] and cermets [14,15]. In recent years, sprayed aluminum alloys are used in a high technology of aeronautics, e.g., as bond coats for thermal barrier coatings on turbine components, as restorative layers for machine parts, for corrosion under pressure, in numerous other applications requiring wear, high temperature and corrosion-resistant surfaces [16][17][18][19][20][21]. The purpose of coatings is to protect the surface of the machine element from attacks.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Modeling of the Mechanical Behavior of Aeronautical Alloy Based Composite

Sadki¹,

Hattali²,

Bradai³

et al. 2016

ujc

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This work focuses on the experimental characterization and mechanical behavior modeling of aeronautical alloy based composite to simulate tension test by finite element method and experimental test. The numerical finite element simulation allowed us to understand and manage a number of phenomena encountered during the mechanical behavior of our composites. Tensile tests applied have shown large changes in mechanical properties of the base alloy after coating, which are possibly related to the very different nature of the assembled materials and conditions of application. We note a strong decrease of the elastic limit of AG3 coated compared to AU4G. The high ductility of this alloy is the cause which engenders during the gritting process a large penetration of the granule particles in the substrate and the creation of plastic zones. Thus, a radial compression is exerted on the section which causes a plastification process. The decrease of the average section of the substrate after sandblasting, the stress concentration at the cavity and / or the compressive residual stress created when sandblasting are responsible for the decrease in breaking strength of the AU4G compared to the AG3. The material becomes hard and fragile. The experimental results obtained during our study are consistent with those of the simulation. Indeed, it was noted that the concentration of stresses during the tensile tests was located at the ends of the useful length of the test specimen.

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Fatigue testing and online inspection of carbon textile composites for aeronautical applications

Cited by 3 publications

References 19 publications

Influence of pulse duration on the fatigue behavior of a carbon‐fiber‐reinforced composite under cyclic three‐point bending at 20 kHz

Influence of pulse duration on the fatigue behavior of a carbon‐fiber‐reinforced composite under cyclic three‐point bending at 20 kHz

Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending

Characterization and Modeling of the Mechanical Behavior of Aeronautical Alloy Based Composite

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