운전하중하의 레인플로집계법을 이용한 철도차량 무개화차의 피로누적손상과 수명예측

초록

A n en d beam is o n e o f th e m ost im p o rta n t stru c tu ra l m em bers sup p ortin g u n co v ered freig h t u nd er in -se rv ic e lo a d in g . In g en eral, it n eed s to en d ure o v er 25 y e a rs. H ow ever fa tig u e fra c tu re h as o ccu rred a t d yn am ic s tre s sco n cen tra tio n lo c a tio n o f th e en d beam b ecau se u ser's sp e c ific a tio n s d em and ed h ig h sp eed an d v eh ic le m an u factu rerm ade th e u n co v ered freig h t c a r w ith com p a ra tiv e ly low stren g th an d stiffn e s s. F or d u rab ility an a ly sis, fin ite e lem en t an a ly sis is p erfo rm ed to ev a lu a te th e p ro b lem o f u nco v ered freig h t stru c tu re an d lo c a l stra in . T he u nco v ered fre ig h t c a rw a s o p e ra ted o n a c tu a l p ro b lem atic ra ilro ad lin e to m e a su re d y nam ic s tre s s v ersu s tim e histo ry o n th e c ritic a l p art fromw hich a c rack is in itia te d o ften . R ainflow cy c le co u n tin g m eth o d w as u sed to e stim a te fa tig u e d am ag e a t d ang ero u s a re au nd er o p e ra tin g co n ditio n . T h e re fo re , th is stu dy show s th a t an a ly tic a l fa tig u e life a t th e en d beam can b e p red icted o nth e b a sis o f S -N cu rv e an d stru c tu re an a ly sis an d h as a fa irly g oo d co rre la tio n w ith ex p e rim en ta l fa tig u e life .

키워드