Damage analysis of thrust chamber wall structure under the creep-fatigue interaction
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.
thrust chamberlow-cyclic fatiguehigh temperature creepinteractive damagelife prediction
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