液体火箭发动机再生冷却结构弹塑性分析

In order to analyze the stress and deformation distribution on the thrust chamber wall， and study its failure position and mechanism， an elastoplastic finite element analysis meth⁃ od was established. A one ⁃ dimensional thermofluid model for the thrust chamber was set up to provide input for the elastoplastic analysis. A two ⁃ dimensional elastoplastic calculation model for the thrust chamber wall under thermal and pressure load was established. The stress ⁃ strain re⁃ sponse of the thrust chamber wall under the working cycle of pre ⁃cooling， hot run， post⁃cooling and relaxation was analyzed. Then， the effect degree of thermal load and pressure load was com ⁃ pared. The life time of the thrust chamber was estimated. The results showed that，the elastoplas⁃ tic deformation of thrust chamber wall was caused by the combined action of thermal load and pressure load， and the thermal load played a leading role. Failure of the thrust chamber occurred first in the center of the cooling channel， which limited the service lifetime of thrust chamber. In terms of calculation time and accuracy， the proposed method can provide a reference for optimal design and performance estimation of regenerative cooling channels.