CMC S弯喷管材料-结构多尺度优化设计研究

Material-structure multi-scale optimization design of CMC serpentine nozzle

关键词:  陶瓷基复合材料  S弯喷管  筋条加强结构  变形抑制  多尺度优化

Key words:  Ceramic matrix composites  Serpentine nozzle  Rib-reinforcement structure  Deformation suppression  Multi-scale optimization

摘要:

S弯喷管作为大尺寸薄壁结构，在多场耦合作用下有着复杂的整体和局部刚度特性。本文针对S弯喷管变形特征，提出一种基于陶瓷基复合材料（CMC）的S弯喷管连续筋条加强结构，可以有效抑制S弯喷管的整体变形和局部变形。与GH4169合金相比，CMC材料可以降低S弯喷管45.31%的变形量，同时减重62.77%，在此基础上，采用连续筋条加强结构可以进一步降低CMC S弯喷管43.15%的变形量。基于代理模型和差分进化算法，以CMC材料筋条加强S弯喷管的结构质量为目标，以CMC材料细观编织结构中的经/纬纱比例以及喷管宏观结构中的分区域壁厚和加强筋尺寸为优化变量，开展了材料-结构多尺度优化，在相同的刚度指标要求下进一步优化减重26.21%。

Abstract:

Serpentine nozzle， which is a large-sized thin-walled structure， displays complex overall and local stiffness characteristics due to the influence of multiple-field coupling effects. This study proposes a continuous rib-reinforced structure for serpentine nozzle using ceramic matrix composites （CMC） to effectively mitigate overall and local deformations. In comparison to GH4169， CMC demonstrates a 45.31% reduction in nozzle deformation while simultaneously reducing mass by 62.77%. Additionally， the rib-reinforced structure presented in this paper can further decrease CMC serpentine nozzle deformation for 43.15%. To minimize the mass of CMC rib-reinforced serpentine nozzle， a material-structure multiscale optimization is conducted using surrogate models and the differential evolution algorithm. The optimization variables encompass the warp/weft yarn ratio in the microstructure of CMC， as well as the partition wall thickness and rib size in the macrostructure of the nozzle. Through this optimization process， a mass reduction of 26.21% is achieved while maintaining the same stiffness requirements.