蠕变-疲劳耦合作用下推力室内壁结构损伤分析  

Damage analysis of thrust chamber wall structure under the creep-fatigue interaction

作　　者：王红建[1] 王超[1] 施蔚 杜大华 WANG Hongjian;WANG Chao;SHI Wei;DU Dahua(School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;Xi'an Aerospace Propulsion Institute,China Aerospace Science and Technology Corporation,Xi'an 710100,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]中国航天科技集团有限公司西安航天动力研究所,西安710100

出　　处：《航空动力学报》2024年第7期29-35,共7页Journal of Aerospace Power

摘　　要：可重复使用液体火箭发动机能大幅降低航天运输成本,其中推力室内壁结构的循环使用寿命是影响可重复使用性能的关键因素.基于Chaboche随动强化模型和Norton蠕变模型建立推力室内壁材料的本构方程;采用瞬态热-力耦合分析方法,获得推力室各工况下的温度场与应力-应变分布;通过Lagneborg累积损伤法建立损伤模型,其中考虑了蠕变-疲劳的耦合作用,以预测内壁结构损伤及循环寿命.研究结果表明:推力室内壁结构损伤形式以低周疲劳损伤和蠕变-疲劳耦合损伤为主,其中低周疲劳损伤占比65.8%,蠕变-疲劳交互作用损伤占比29.8%,因此为了准确预测推力室内壁结构的循环使用寿命,需考虑结构在蠕变-疲劳耦合损伤作用下的影响因素.The reusable liquid rocket engine can greatly reduce the cost of space transportation.One of the key factors for the reusable performances is cyclic life of inner wall structures of thrust chamber.The constitutive equations of wall materials of the thrust chamber were established based on Chaboche kinematic hardening model and Norton creep model.The temperature fields and stress-strain distributions of the thrust chamber under various working conditions were obtained by employing the analysis of transient thermo-mechanical coupling;the damages and cyclic life of the inner wall structure were investigated by Lagneborg cumulative damage model by considering the coupling effects of creep and fatigue.The investigation showed that the key patterns of damage in wall structures of thrust chamber were low-cyclic fatigue and creep-fatigue interaction damage with low-cycle fatigue damage ratio 65.8%,and creep-fatigue interaction damage ratio 29.8%.Therefore,in order to accurately predict the cycle life of thrust inner wall structures,the influencing factors of structures under the action of creep-fatigue interaction damage should be considered.

关 键 词：推力室 低周疲劳 高温蠕变 交互损伤 寿命预测 

分 类 号：V434.24[航空宇航科学与技术—航空宇航推进理论与工程]