Lightning, Lightning Protection and test Standards

Krider, E. Philip; Uman, M. A.

doi:10.1002/047134608x.w3402

Cited by 1 publication

(2 citation statements)

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“…The heat capacity for the CNF was set to 0.716 J/(g K), assuming it is similar to that of graphite, 43 while the heat capacity of epoxy was set to 1.06 J/(g K). 44 The values used for density were 1.80 and 1.17 g/cm 3 for CNF and epoxy, respectively. 45,46 For the Fourier method, constant temperature boundary conditions were maintained at each surface, with the top surface being kept at 310 °C and the bottom surface at 300 °C.…”

Section: Solution Methodologymentioning

confidence: 99%

“…However, even though the main function of these composites is structural, they can be exposed to large temperature fluctuations, such as when subjected to lightning strikes. It has been reported that the nature of lightning strikes consists of multiple high current (up to 80 kA) short pulses (∼0.25–200 ms), , which can generate large heat fluxes in the composite. Addressing fiber composite behavior when subjected to a short heat pulse of large magnitude is of significant importance due to the possibility of thermal degradation within the composite. , Therefore, developing thermally conductive nanocomposite materials to be used for heat dissipation and structural protection is of significant value.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal Interface on Heat Flow in Carbon Nanofiber Composites

Gardea

Naraghi

Lagoudas

2013

ACS Appl. Mater. Interfaces

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The thermal transport process in carbon nanofiber (CNF)/epoxy composites is addressed through combined micromechanics and finite element modeling, guided by experiments. The heat exchange between CNF constituents and matrix is studied by explicitly accounting for interface thermal resistance between the CNFs and the epoxy matrix. The effects of nanofiber orientation and discontinuity on heat flow and thermal conductivity of nanocomposites are investigated through simulation of the laser flash experiment technique and Fourier's model of heat conduction. Our results indicate that when continuous CNFs are misoriented with respect to the average temperature gradient, the presence of interfacial resistance does not affect the thermal conductivity of the nanocomposites, as most of the heat flow will be through CNFs; however, interface thermal resistance can significantly alter the patterns of heat flow within the nanocomposite. It was found that very high interface resistance leads to heat entrapment at the interface near to the heat source, which can promote interface thermal degradation. The magnitude of heat entrapment, quantified via the peak transient temperature rise at the interface, in the case of high thermal resistance interfaces becomes an order of magnitude more intense as compared to the case of low thermal resistance interfaces. Moreover, high interface thermal resistance in the case of discontinuous fibers leads to a nearly complete thermal isolation of the fibers from the matrix, which will marginalize the contribution of the CNF thermal conductivity to the heat transfer in the composite.

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