Vol.25 No.6 杨海波等：斜轧零件应力应变特征与内部低周疲劳损伤机制 ·567· Characteristic Stress-Strain and Damage Mechanism of Workpiece Due to Low Cycle Fatigue in Skew Rolling YANG Haibo,ZHANG Lijie,MA Guohua,HU Zhenghuan Mechanical Engineering School,University of Science and Technology Beijing.Beijing 100083,China ABSTRACT The 3-dimension finite element models of tool and workpiece in the skew rolling process were built up with ANSYS/LS-DYNA.Computer simulations on the ladder shaft in skew rolling under different parameters were conducted.According to the simulation results,the stress and strain of workpiece in the skew rolling were ob- tained and the forming mechanism of interior defects in the billet were studied.A explanation to the mechanism of Mannesmann effect is that low cycle fatigue damage,in the condition of deformation with large plastic strain,oc- curs inside the workpiece due to the alternately-changing stress and strain. KEY WORDS metal forming;skew rolling;low cycle fatigue;interior defect;simulation $2as父sas望es望as堂as业aorc6童eo管s里Poror堂o里wss堂es理e望ee里o星eoTeo望ee里es望ooFooPoot望Too?ao9eoTeoToo6o堂tos里u7 Tooeo父so望oo堂on望c6 (上接第562页) 3金晓光，刘玉礼，张文志，等.H型钢万能轧制过程 综合实验研究[).重型机械，1998(1)：22 Computer Simulation of Rolling for H Beam WANG Xin",WANG Changsong",YIN Zuoyong,TAO Dengkui",MA Guangting" 1)Mechanical Engineering School,University of Science and Technology Beijing,Beijing 100083,China 2)Laiwu Iron Steel Incorporation,Laiwu 271104,China ABSTRACT Rolling model of H beam was established through MSC Marc/AutoForge FEA software and rolling process was simulated to solve the defect problem for H beam.The metal flow in rolling process was simulated by thermo-mechanical coupled elastic-plastic element and the pressure distribution on web was given.The simulating results are agreeable with the measureed data. KEY WORDS H beam;rolling;finite element;metal flowV o l . 5 2 o N . 杨 海波 等 6 : 斜 轧零 件应 力应 变特 征与 内部 低周疲 劳 损伤机 制 7 6 5 h r a C e a t r e i s i t e r S t e 一 s s r S t a i n n a d D m a a g e M e e h n a i s m o f O 认 / r i P k u e e e c D t o L o w C y e l e i g F a t u e i n S k i e ll g n R o w i 改 A b Y H N G o , 2 2去咬八Z G L 扩ie, 几侧 G ou hu a, H 乙了 hZ e 刀 gk ~ M e e h an i e a l Egn in e e r i n g S e h o o l , nU iv e rs ity o f s e i e n e e an d eT e hn o l o gy B e ij i n g , B e ij 雌 10 0 0 8 3 , C h in a A B S T R A C T hT e 3 一 d im e n s i o n if in t e e l e m ent m o d e l s o f t o o l an d w 0 r k Pi e e e i n ht e s k e w r o l l i n g P r o e e s s w e re b u i l t 即 w i t h A N s Y S几s 一 D Y N A . C o卿ut e r s im ul at i o n s o n hte l a dd e r s h a ft i n s k e w r o lli n g un d e r d i fe r e n t p ar am e t e r s w e r e e o n du e t e d . A c e o r d i n g t o ht e s im u lat i o n r e s ul t s , ht e s tr e s s a n d s tr a i n o f w or kP i e e e i n th e s k e w or l l i n g w e er o b - iat en d an d ht e fo mr in g m e e h an i sm o f iin e ir o r d e fe e t s i n ht e b i ll e t w e r e s ut d i e d . A e x P l an at i o n t o t h e m e e h an i s m o f M a n n e s m an e fe e t 1 5 th at l o w cy e l e fat igu e d am ag e , i n th e e o n id t i o n o f d e fo mr at i o n w iht l a gr e P las t i e s atr i n , o e - e usr i n s id e ht e w o r k Pi e e e d u e t o ht e a l t e nr at e ly 一 c h a n g i n g s etr s s a n d s t r a l n · K玉 Y W O R D S m e ta l fo mr i n g ; s k e w r o ll i n g ; l o w e y e l e aft i g u e ; iin e ir o r d e fe c t: s im ul at i on (上 接 第 5 6 2 页 ) 3 金晓 光 , 刘 玉 礼 , 张 文志 , 等 . H 型钢万 能轧 制过 程 综 合实 验研 究 [J] . 重型机 械 , 1 9 98 (:1) 2 C o m P u t e r S im u l a t i o n o f R o lli n g fo r H B e am 恻 N G j 介刀 1), 洲刃 G hC an gs o衅 , I了八 护 uZ 口y o n g l 户, TA 口 eD 矛替饭iz), 舫叼 Gau 月 gt i n犷 夕 l ) M e e h an i e a l E n g i n e e r i n g S e h o o l , U n i v e rs ity o f s e i e n e e an d eT e hn o l o gy B e ij i n g , B e ij ign I 00 0 83 , C h i n a 2 ) L a iwu Ior n & S te e l I n e o rp o 花t jon , L a iwu 2 7 1 10 4 , C h i n a A B S T R A C T R o llign m o d e l o f H b e am w a s e s atb l i s h e d htr o u gh M S C M acr A/ ut 0 F o gr e F E A s o ft w ar e an d r o lli n g P r o c e s s w a s s im u l at e d t o s o l v e hte d e fe e t rP ob l e m of r H b e am . T h e m e t a l fl o w i n or l li n g P r o e e s s w a s s im u lat e d 妙 hte rm o 一 m e e h an i e al e o u P l e d e l a s t i e 一 P l a s t i e e l e m e nt an d t h e P r e s s ure d i s树b ut i o n o n we b aw s g i ve n , hT e s i m u l a t i n g re s u l t s ar e a gr e e a b l e w iht ht e m e as ure e d d a at . K E Y W O R D S H b e am ; r o l l i n g : if n i t e e l e m e in ; m e t a l fl o w