涡轮泵防松锁片结构疲劳寿命评估及影响因素识别OA

The anti-loosening lock plate structure of a turbopump suffers initial damage during assembly due to large plastic deformation.Under the combined effects of pulsating pressure and mechanical vibration,the structure faces fatigue failure risks that severely compromise engine operational safety.Based on the theory of continuum damage mechanics,the plastic damage induced during assembly is integrated into a fatigue life analysis model,establishing a fatigue life assessment method accounting for initial damage.Pre-strain-tension and fatigue tests are conducted to investigate the impact of pre-strain on the mechanical properties of the lock plate material.Full-service load history-based fatigue life prediction and influencing factor analysis are performed on the anti-loosening lock plate structure.Results indicate:the critical fatigue zone is located at the fillet of the lock plate root.Increasing the root fillet radius or reducing the crush depth can effectively extend the fatigue life.Excessively thin or thick lock plate thickness will reduce the fatigue life.