Experimental study of high electric current effects in carbon/epoxy composites

Deierling, Phillip; Zhupanska, Olesya I.

doi:10.1016/j.compscitech.2011.07.017

Cited by 24 publications

(10 citation statements)

References 10 publications

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“…As a result, the thermal stress will be generated which can greatly influence the stiffness and strength of composites. And it was also found that thermal stress caused by temperature variations plays an important role in materials' failure [1][2][3][4]. Therefore, it is necessary and urgent to analyze the thermal conductive behaviors of composites.…”

Section: Introductionmentioning

confidence: 99%

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Dong

Sun

2015

J Therm Anal Calorim

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This paper reports thermal conductive behaviors of three kinds of materials, i.e., epoxy resin bar, carbon fiber bundles/epoxy system, and unidirectional carbon fiber/epoxy lamina along 0°and 90°directions. The apparatus for thermal conduction measurement was manufactured and calibrated with an aluminum bar with known thermal conductivity. The thermal conductive behaviors, including the thermal conductive rate and thermal equilibrium time, were tested and numerically simulated with finite element method. It is found that these materials have similar thermal conductive characteristics with same trends of temperature-time curves and thermal gradient-time curves. In addition, with the increase in fiber volume content or decrease in fiber orientation angle, the thermal conductive rate will be speeded up and thermal equilibrium time will be reduced. The temperature of epoxy resin in composite will increase with the increment of fiber volume content. Due to the existence of interface between fiber and resin, the overall thermal conductive ability of composite will be weakened. Owing to the epoxy resin, carbon fiber bundles/epoxy system and unidirectional carbon fiber/ epoxy lamina are the basic materials for the laminates or complex preform reinforced composites, and the thermal conductive behaviors of these basic materials could be extended to design the thermal conductive behaviors of laminates and complex reinforcement composite materials.

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Section: Introductionmentioning

confidence: 99%

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Dong

Sun

2015

J Therm Anal Calorim

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“…The surfaces of the composite plates and electrodes, other than those that are in the electric contact, are assumed to be exposed to air, and Newton's convection takes place there. The electromagnetic boundary conditions are assumed as = 0, tljr=a/2 = 0 (12) where the first electromagnetic boundary condition ensures that the electric current does not pass through the boundary y = -a/2.…”

Section: Problem Formuiation For the Cfrp Composite Piate Subjected Tmentioning

confidence: 99%

“…At the same time, application of the"pulsed current leads to a significant reduction in the maximum temperature attained in the plate and has the highest potential to eliminate the negative thermal effects experimentally observed in composites subjected to DC currents [9,11,12], including thermal stresses and polymer matrix degradation.…”

Section: Time [S]mentioning

confidence: 99%

“…The mechanical behavior of CERP composites in the presence of an electromagnetic field is a result of complex electro-magneto- ' thermo-mechanical interactions. The coupling between mechanical and electromagnetic fields is due to the Lorentz ponderomotive force that is exerted by the electromagnetic field [1-8], whereas coupling between electromagnetic and thermal fields is due to electric-current-induced heating [9][10][11][12]. Moreover, the electric-current-induced thermal field may lead to thermal deformation in the CFRP composites, which adds an additional layer of complexity to the coupling phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…This coupling mechanism can potentially lead to the development of structures amenable to active control by the electromagnetic field. However, highintensity or long-duration applications of the electromagnetic loads lead to significant heating that may result in the development of thermal stresses and degradation of the mechanical properties, if the temperature in a polymer matrix composite exceeds the glass transition temperature [8][9][10][11][12]. One possible way to mitigate the negative effects of the current-induced heating observed in experiments on electrified composites subjected to a high DC current [9] is to apply electromagnetic loads of high intensity but short duration (i.e., pulsed electromagnetic loads).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal and Mechanical Response of a Carbon Fiber Reinforced Composite to a Transverse Impact and In-Plane Pulsed Electromagnetic Loads

Barakati

Zhupanska

2012

Journal of Engineering Materials and Technology

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Thermal and mechanical response of a carbon fiber polymer matrix composite plate subjected to a transverse impact and in-plane pulsed electromagnetic loads is studied. Heat transfer analysis in the electrified composite plate for the electric currents of various waveforms (direct current (DC), alternating current (AC), and pulsed) is conducted, and the effects of the waveform parameters (characteristic time, peak, etc.) on the currentinduced heating in the composite are investigated. The results show that pulsed electric currents cause significant temperature rises only in the regions immediateiy adjacent to the electric contact (composite-electrode interface). As for the mechanical response of the composite piate, it is found that the characteristics of the electromagnetic field (waveform, duration of application, and intensity) can significantly reduce deflection and stresses in the plate, and concurrent application of a pulsed electromagnetic load can effectively mitigate the effects of the impact load in the electrically conductive composites.

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Coupled thermal‐electrical analysis of carbon nanotube/epoxy composites

Prolongo

Rosario

Ureña

2013

Polymer Engineering & Sci

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The electrical and thermal behavior of epoxy composites reinforced with different contents of multi‐walled carbon nanotubes (from 0.1 to 0.4 wt% CNT) is studied when they are subjected to relatively high DC voltages (from 1 to 100 V). These materials obey Ohm's law, reaching values of electrical conductivity in the range of 0.01–0.5 S/m. The transported electric current leads to a significant increase of temperature, which is a result of the Joule heating effect. The temperature increases to 40ºC in CNT/epoxy composites when applying 100 V. The study of heating due to Joule's effect gives information about the electrical transport mechanisms implied. It is also confirmed that both, electrical conductivity and Joule's heating effect depend on the morphological features of the composites. The functionalization of CNTs decreases the electrical conductivity of composites but increases their corresponding Joule heating, due to the strong interface between the nanotubes and matrix, which hinders the formation of pathways in CNT in direct contact. The technique of CNT dispersion applied also affects to the increase of temperature induced by the electrical current. POLYM. ENG. SCI., 54:1976–1982, 2014. © 2013 Society of Plastics Engineers

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Experimental study of high electric current effects in carbon/epoxy composites

Cited by 24 publications

References 10 publications

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Thermal and Mechanical Response of a Carbon Fiber Reinforced Composite to a Transverse Impact and In-Plane Pulsed Electromagnetic Loads

Coupled thermal‐electrical analysis of carbon nanotube/epoxy composites

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