Mechanical characterization of sandwich composites with embedded sensors

Sousa, J.; Marques, J. P.; Garcia, Madalena; Infante, V.; Amaral, P.M.

doi:10.1016/j.engfailanal.2020.104765

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…The variable frequency speed-regulating traction motor is one of the critical components of high-speed EMU power equipment and its performance is key to ensuring stable and reliable operation of the train. In the variable frequency speed-regulation traction system, due to the motor-generated overvoltage [1][2][3] coupled with the uneven distribution of pulse voltage on the winding group, corona discharge occurs between winding turns, so that the insulation system of the motor is destroyed due to premature breakdown [4][5][6]. Studies have shown that corona discharge in the inter-turn insulation of the motor is the root cause of motor insulation failure.…”

Section: Introductionmentioning

confidence: 99%

Corona Resistance Mechanism of Nano-Modified Polyimide

Chen¹,

Li²,

Zhao³

et al. 2022

Polymers

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In this paper, the effect of field strength on the corona-resistant lifespan of a composite film and the effect of doping on the dielectric properties of the composite film were studied. The method for predicting corona-resistant lifespan under working electric field strength is discussed. Scanning electron microscopy (SEM) was used to characterize the morphology and the structure of the composite film near the breakdown point after corona formation. Fourier transform infrared spectroscopy (FT-IR) was used to characterize the imidiated film, and a conductivity current test was used to calculate the electrical aging threshold of the film. The results showed that the introduction of nano-SiO2 particles could greatly improve the corona-resistant lifespan of the material. At 155 °C, when the applied external electric field strength was extrapolated to 20 kV/mm, the corona-resistant lifespan of the PI/nano-SiO2 three-layer composite film with 10 wt% nano-particle doping was 7472.61 h.

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Section: Introductionmentioning

confidence: 99%

Corona Resistance Mechanism of Nano-Modified Polyimide

Chen¹,

Li²,

Zhao³

et al. 2022

Polymers

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“…As the application field for marine composites widens, the request for mechanical and environmental resilience rises. Limit stress states, durability and life span, failure modes, fracture toughness, fire resistance, and environment influence parameters are crucial for an efficient, sustainable, and secure design process for structures in this demanding industry sector [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Deterioration of FRP Composite Properties Induced by Marine Environments

Vizentin

Vukelić

2022

JMSE

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In this paper, a model for the prediction of fatigue life degradation of fiber-reinforced (FRP) composite materials exposed for prolonged periods to real marine environments is proposed. The data collected during the previous phases of a more comprehensive research of real marine environment-induced changes of mechanical properties in FRP composites are used to assess the influence of these changes on the durability characteristics of composites. Attention is paid to the classification societies’ design and exploitation rules on this matter. The need for the modification of the process used for obtaining composite material S–N curves, considering the influence of the marine environment, is studied. A regression analysis of the experimental data is conducted, resulting in a mathematical model of strength degradation over time. The regression analysis shows an acceptable correlation value. The S–N curves for E-glass/polyester composites with three different fiber layout configurations are evaluated and modified to encompass the findings of this research.

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“…These thin films are mainly used in electronic devices, multilayer surface coatings on metals, coatings on intermetallic compounds, temperature protection blankets in space crafts and magnetic wire enamelling for electric motor insulation [ 1 , 2 ]. PI thin films are also used for sensor coatings and composite electrodes for batteries [ 3 , 4 , 5 , 6 , 7 , 8 ]. PI nanocomposite films have also been studied and reported in different well-reputed research articles [ 9 , 10 , 11 , 12 ]; however, among these well-documented research articles, most of the focus is on the electrical breakdown strength related to the charge trapping and de-trapping mechanism and mechanical breakdown strength [ 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Steady-State Conduction Current Performance for Multilayer Polyimide/SiO2 Films

et al. 2021

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The steady-state electrical conduction current for single and multilayer polyimide (PI) nanocomposite films was observed at the low and high electric field for different temperatures. Experimental data were fitted to conduction models to investigate the dominant conduction mechanism in these films. In most films, space charge limited current (SCLC) and Poole–Frenkel current displayed dominant conduction. At a high electric field, the ohmic conduction was replaced by current–voltage dependency. Higher conduction current was observed for nanocomposite films at a lower temperature, but it declined at a higher temperature. PI nanocomposite multilayer films showed a huge reduction in the conduction current at higher electric fields and temperatures. The conclusions derived in this study would provide the empirical basis and early breakdown phenomenon explanation when performing dielectric strength and partial discharge measurements of PI-based nanocomposite insulation systems of electric motors.

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Mechanical characterization of sandwich composites with embedded sensors

Cited by 12 publications

References 16 publications

Corona Resistance Mechanism of Nano-Modified Polyimide

Corona Resistance Mechanism of Nano-Modified Polyimide

Prediction of the Deterioration of FRP Composite Properties Induced by Marine Environments

Steady-State Conduction Current Performance for Multilayer Polyimide/SiO2 Films

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