Assessment of Anisotropy on Strength Properties of the Propulsion System Combustion Chamber Heat-Protective Coating During Changes in Ambient Temperature

Abstract

The coating based on polyurethane, nitrile butadiene, butyl rubbers, that are obtained by compression molding from a calendered rubber mixture, are used to ensure the thermal protection of the solid-fuel rocket engine combustion chamber internal surfaces. Due to the anisotropy (the calender effect), the final coating characteristics depend on the orientation of the blanks placed in the mold before vulcanization. During the propulsion system transportation and storage, internal stresses arise in the heat-protective coatings due to different temperatures at the surface and inside the product and can lead to cracking of the coating and subsequent burn-through of the wall during engine operation. This article purpose is assessment of anisotropy on strength properties of the propulsion system structural element during changes in ambient temperature using the example of the heat-protective material made from the nitrile butadiene rubber. It is established that the tensile strength of the coating, which initial blank is made by extrusion proposed as the method for anisotropy eliminating, is located between the values defined along and across the calendering direction. The data is obtained and the coating strength properties decrease rate as a result of exposure to cyclical changes in ambient temperature is estimated

Please cite this article in English as:

Ushakova E.S., Tuponogov V.G. Assessment of anisotropy on strength properties of the propulsion system combustion chamber heat-protective coating during changes in ambient temperature. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2026, no. 1 (156), pp. 115--126 (in Russ.). EDN: BFLPQZ

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