九级整流叶片断裂分析-失效分析与预防.PDF

2010 8 A ugu st, 20 10 5 3 V o l. 5, N o. 3 , , ( 中国人民解放军驻四二厂军事代表室, 成都 6 10503) [ ] 150 h( 170 h) , 3 , , , : U , , , , , [] ; ; ; [] V 232. 4 [ ] A d oi: 10. 3969 / . issn. 1673-6214. 20 10. 03. 007 [] 1673-62 14( 20 10 ) 03-0 160-04 Failure Analysis of Stage 9 Stator B lade ZOU H an- song, CAO Jiang, X ING X iao-peng (PLA M ilitary R ep resentative Off ice Stationed 420 Factory, Chengdu 610503, China) A b stract: A stage 9 stator blade in an eng ine w as found to have fractured after testing for 150 h and surge testing for th ree tmi es. In ord er to f ind ou t the mode and cause of th e failure, m acro and m icro ob servat ion, chem ical com pos ition an aly sis, hardn ess testing and m etallu rgical structu re ex am ination w ere perform ed. In add it ion, vib ration calcu lation and frequ ency m easu ring w ere carried ou t on the b lade. T he results show that the fracture of the b lad e is fat igu e fracture resu lting from stress con cen tration. T here ex isted an edge at th e o int of th eU- shape groove and the dorsa l side of the b lade, wh ere the largest stress ex isted. In addit ion, there ex is ted m ach in ing traces near th e fatigue source. St ress con cen tration resu lted in th e fatigue fractu re. K ey w ords: eng ine; stato r b lade; fa tigue fracture; stress concentration , 0 , 1 , 1. 1 [ 1]