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Study of the Effects of Materials Selection for the Closeout Structure on the Service Life of a Liquid Rocket Engine Thrust Chamber

机译:材料选择对液体火箭发动机推力室使用寿命的效果的研究

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摘要

The external structure of rocket engines thrust chambers for aerospace applications should be designed in order to provide adequate stiffness to the thrust chamber; however, it affects in a significant way the engine service life since it acts as a structural bound for the internal structure which is subjected to very high temperature values. The adoption of thin closeout structures allows to have lighter structures and to significantly increase the service life of the thrust chamber. The aim of the present work is to perform numerical investigations on the influence of the closeout geometry and materials on the number of cycles to failure of the thrust chamber. Furthermore, a study on the impact of creep phenomenon on the service life is illustrated. In particular, the present paper is focused on the thermomechanical study of the closeout structure, in terms of material choice, thickness, joining process with the inner liner, etc. Transient thermal and static structural nonlinear analyses are conducted by means of a commercial finite element code (ANSYS), in order to evaluate the number of cycles to failure for the investigated configurations. Viscoplastic models are adopted in order to simulate the highly nonlinear and rate-dependent phenomena occurring in the inner liner structure.
机译:应设计用于航空航天应用的火箭发动机推力室的外部结构,以便为推力室提供足够的刚度;然而,它以显着的方式影响发动机使用寿命,因为它充当了对经受非常高温值的内部结构的结构界限。采用薄的清约结构允许具有更轻的结构并显着增加推力室的使用寿命。本作作品的目的是对收缩几何形状和材料的影响进行数值调查,对推力室的故障循环的数量。此外,说明了对蠕变现象对使用寿命的影响的研究。特别地,本文专注于收缩结构的热机械研究,就物质选择,厚度,与内衬的连接过程等。通过商业有限元进行瞬态热和静态结构非线性分析代码(ANSYS),以便评估调查配置失败的周期数。采用粘液模型来模拟内衬结构中发生高度非线性和率依赖性现象。

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