Aerospace Instrument-Making Annotation << Back Investigation of the Influence of the Thermal State of a Liquid Rocket Engine Combustion Chamber on its Service Life Lebedev E.L., Lyashevsky A.V., Stelmakh S.F., Savchuk P.N. A methodology has been developed to assess the influence of design features of the cooling channel of a liquid rocket engine (LRE) combustion chamber on its durability. It is shown that the combustion chamber wall being in a state of plane stress during operation leads to the progressive development of cracks in its structure. Practical recommendations for increasing the service life of the chamber at the stages of design, manufacturing, and operation of the LRE are formulated. Keywords: Liquid rocket engine, combustion chamber, stress-strain state, plasticity, combustion wall, thermal protection coating. DOI: 10.25791/aviakosmos.4.2025.1473 Pp. 17-23.