NDLI: Thermal deformation and strength of heat-protective coatings under operating conditions simulating the real ones

Content Provider	IEEE Xplore Digital Library
Author	Gracheva, L.I. Borisenko, V.A.
Copyright Year	1997
Description	Author affiliation: Inst. of Strength Problems, Acad. of Sci., Kiev, Ukraine (Gracheva, L.I.)
Abstract	The thermal deformation of a heat-protective coating of polymer composite material with a phenol-formaldehyde matrix under conditions simulating the temperature-time interval of a spacecraft deorbiting is considered. It is shown that in the plane of reinforcing of the composite the maximum thermal deformations occur in a direction at 45/spl deg/ to the base of the fabric of the filler and with an increase in heating rate is a significant reduction in its amplitude. The residual relative thermal deformation of the heat-protective material tested according to the program of descent from a trajectory may reach 2% and more. The calculation of thermal stresses occurring in a layer of thermal protection during a spacecraft reentry in dense atmosphere is done using a method of the theory of elasticity with allowance made for physico-mechanical characteristics obtained for conditions simulating the actual ones. The tangential stresses, /spl tau//sub z/spl theta// and /spl tau//sub rz/, at the juncture of the frontal shield with the side surface and also at 1/5th of the length of the reentry vehicle at its both ends, at a depth of 3-3, 5 mm from the outer surface are shown to be the most dangerous for the strength of the heat-protective coating.
Starting Page	420
Ending Page	427
File Size	754560
Page Count	8
File Format	PDF
ISBN	0780341678
DOI	10.1109/ICIASF.1997.644761
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-09-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coatings Thermal stresses Aircraft manufacture Space heating Polymer films Composite materials Deformable models Fabrics Materials testing Residual stresses
Content Type	Text
Resource Type	Article

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