Numerical modeling of the effect of heat and mass transfer in porous low-temperature heat insulation in composite material structures on the magnitude of stresses which develop
- 44 Downloads
The stressed state of multilayer low-temperature heat insulation for a cryogenic fuel tank is considered. Account is taken of heat and mass transfer in foam plastic (the main heat insulation material) occurring at cryogenic temperatures. A method is developed for solving a set of differential equations and boundary conditions. Numerical studies of the main features of these processes are performed. It is established that below 200 K the stresses which arise in foam plastic markedly exceed the ultimate strength for this material. Stresses develop as a result of both a reduction in temperature and a drop in pressure in the foam plastic pores connected with material cooling. On the basis of the results obtained it is established that the combination of thermophysical processes which occur in foam plastic during cooling to cryogenic temperatures leads to changes in the stress-strained state of structure, which should be considered in planning aerospace technology.
KeywordsFoam Mass Transfer Composite Material Ultimate Strength Insulation Material
Unable to display preview. Download preview PDF.
- 1.V. D. Protasov, V. L. Strakhov, and A. A. Kul'kov, “Problems of introducing composite materials into structures of aerospace technology,” Mekh. Komopozitn. Mater., No. 6, 1057–1063 (1990).Google Scholar
- 2.V. I. Vyshvanyuk, V. L. Polunin, Yu. B. Reutov, and A. G. Chernov, “Heat and mass transfer in cryogenic heat insulation based on foam plastics. Review of Domestic and Foreign Publications for 1965–1981.” GONTI 1, Ser. XII, No. 138 (1983).Google Scholar
- 3.E. B. Trostyanskaya (ed.), Foam Plastics for Structural Purposes [in Russian], Khimiya, Moscow (1975).Google Scholar
- 4.G. I. Nazarov and V. V. Sushkin, Thermally Stable Plastics: Handbook [in Russian], Mashinostroenie, Moscow (1983).Google Scholar
- 5.I. K. Kikoin (ed.), Tables of Physical Values: Handbook [in Russian], Atomizdat, Moscow (1976).Google Scholar
- 6.G. S. Pisarenko, A. P. Yakovlev, and V. V. Matveev, Strength of Materials Handbook [in Russian], Naukova Dumka, Kiev (1975).Google Scholar
- 7.A. N. Tikhonov, V. D. Kel'na, and V. B. Glasko, Mathematical Modeling of Production Processes and the Method of Inverse Problems in Engineering [in Russian], Mashinostroenie, Moscow (1980).Google Scholar
- 8.A. D. Kovalenko, Bases of Thermoelasticity [in Russian], Naukova Dumka, Kiev (1970).Google Scholar
- 9.V. N. Nikolayevskii, et al., Mechanics of Impregnated Porous Materials [in Russian], Nedra, Moscow (1970).Google Scholar
- 10.A. A. Samarskii, Difference Scheme Theory [in Russian], Nauka, Moscow (1977).Google Scholar
- 11.I. N. Bronshtein and K. A. Semendyaev, Mathematics Handbook [in Russian], Nauka, Moscow (1986).Google Scholar