Thermal resistance of multicontact packets

Kurskaya, T. A.; Levchenko, E. P.; Mikhal'chenko, R. S.; Rybalko, A. M.; Sukharevskii, B. Ya.

doi:10.1007/bf00832107

Cited by 3 publications

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“…For a layered composite media with isotropic layers λ 11 (k ) = λ 22 (k ) = λ 33 (k ) ( ) oriented in parallel to the plane (x 2 , x 3 ), the following structural formulas for the effective coefficients of thermal conductivity are available (see, e.g., [8]):…”

Section: Figmentioning

confidence: 99%

“…For example, the processes of thermal conductivity in layered composites were considered in [8,12], the thermophysical behavior of unidirectionally reinforced fibrous materials was modeled in [7,10,13,[15][16][17]22], and the thermal conductivity of composites cross-reinforced in a plane (in particular, woven ones) was studied in [10,14,19,21]. However in recent years, special attention was paid to spatially reinforced composites, since they allow one to remove such shortcomings of layered composites as the danger of separation due to a weak resistance to the interlayer shear and the cleavage and to localize the propagation of cracks.…”

Section: 21mentioning

confidence: 99%

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Determination of the effective coefficients of thermal conductivity of rib-reinforced polyfoams on the basis of the energy criterion of equivalence

Yankovskii¹

2012

J Math Sci

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536.21We propose models of thermal conductivity of rib-reinforced polyfoams that are based on the condition of equality of dissipations in the equivalent material and the composite under study. The comparison of the calculated effective coefficients of thermal conductivity for unidirectionally and spatially reinforced polyfoams is performed. It is shown that the proposed models give lower and upper bounds for calculated effective coefficients of thermal conductivity for the composites under study.In recent years, layered constructions with polyfoams as a filler have been frequently used in objects of the aerospace complex and in other branches of industry. Polyfoams can be nonreinforced or reinforced by plates or wires or can form various ribbed structures (cellular, folded, corrugated, etc.).The potentialities of polyfoams as light fillers become more diverse if they are used in the form of reinforced layered structures such as polyfoams with layers of structural materials (metal, plywood, etc.) or, most frequently, in the form of strips [2].The application of modern polyfoams (for example, frothed ones) allows one to produce ribbed constructions (cellular, folded, etc.), in which the cavities are filled with polyfoam. Such fillers, due to the presence of plastic in them, possess good characteristics with respect to vibrations, since polyfoam operates as a damper and ensures a high coefficient of attenuation of vibrations. In addition, polyfoam filling the cavities of a ribbed structure ensures a better joint operation of elements of this structure, supports them, and prevents the loss of their stability under compression and shear, which in the whole determines the stiffness and strength characteristics of fillers (cellular, folded, etc. ones) [6]. Similar structures of fillers can be considered as polyfoams with ribbed structures of reinforcement.Since layered structures with filler used in the aerospace field can undergo intense heat influence in the process of operation, the problem of calculation of the temperature fields in elements of such structures, in particular, in a filler, which can be a spatially and, as a rule, curvilinearly reinforced composite, is urgent.Due to the urgency of the problem of thermal conductivity of reinforced materials, it was a subject of studies of many researchers. For example, the processes of thermal conductivity in layered composites were considered in [8,12], the thermophysical behavior of unidirectionally reinforced fibrous materials was modeled in [7,10,13,[15][16][17]22], and the thermal conductivity of composites cross-reinforced in a plane (in particular, woven ones) was studied in [10,14,19,21]. However in recent years, special attention was paid to spatially reinforced composites, since they allow one to remove such shortcomings of layered composites as the danger of separation due to a weak resistance to the interlayer shear and the cleavage and to localize the propagation of cracks. Works devoted to the study of the thermal conductivity of spatially reinforced mat...

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Section: Figmentioning

confidence: 99%

Section: 21mentioning

confidence: 99%

Determination of the effective coefficients of thermal conductivity of rib-reinforced polyfoams on the basis of the energy criterion of equivalence

Yankovskii¹

2012

J Math Sci

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Determining the thermal resistance of laminated stacks at temperatures from 4 to 300?K

Bol'shakov

Васильев

Pozvonkov

1973

Journal of Engineering Physics

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Kurskaya

Levchenko

Mikhal'chenko

et al. 1971

Journal of Engineering Physics

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MuItiple-contact stacks of plates either sprayed with manganese dioxide or perforated have better thermal characteristics than stacks of solid "pure" plates. Under vibrating loads, however, the insulating characteristics of the former and the mechanical strength of the latter are degraded. ~rthermore, the manufacturing cost of either ty-pe of stack is quite high [t]. COS(p b2k_ t = (4k -1)/P~k_l(i sh~/0) P2k-l(t) r + sh~ ~0 dr;P2k-i(~) are Legendre polynomials.Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar'kov.

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Thermal resistance of multicontact packets

Cited by 3 publications

References 1 publication

Determination of the effective coefficients of thermal conductivity of rib-reinforced polyfoams on the basis of the energy criterion of equivalence

Determination of the effective coefficients of thermal conductivity of rib-reinforced polyfoams on the basis of the energy criterion of equivalence

Determining the thermal resistance of laminated stacks at temperatures from 4 to 300?K

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