·650 北京科技大学学报 2002年第6期 体系的成膜性能，使润滑剂的润滑机制发生改 4虞路清，李久青.复合人工滑液的流变性能及润滑机 变，摩擦系数降低 制分析[.北京科技大学学报，2001,23(4)：332 5 Murakami T,Sawae Y.The adaptive multimode lubrica- 参考文献 tion in knee prostheses with artificial cartilage during wal- king [A].Dowson D.Elastohydrodynamics[C].Else- 1 Murakami T,Higaki H,Sawae Y,et al.Adaptive multi- vier Science B V,1997.371 mode lubrication in natral synovial joints and artificial 6 Toshimitsu Yokobori A,Takashi Kawaharada.Mechanical joints [J].Proc Instn Mech Engrs,1998,212:23 test method on the estimation of the lubricant performance 2 Dowson D,Wright V.Introduction to the Biomechanics of by hyaluronic acid []Bio-Medical Materials and Engin- Joints and Joint Replacement [M].London:MEP,1981. eering,1995,5(2):117 139 7朱步瑶，赵振国.界面化学基础M)北京：化学工业 3王丽，高瑾，李久青，聚乙烯醇水凝胶人工软骨润滑 出版社，1996.74 体系研究J.云南大学学报（自然科学版），2002,241)： 309 Influence of Artificial Synovia by La-DPPC on Lubricate Capability WANG Li",GAO Jin "LI Jiuging",LOU Siquan 1)Material Science and Engineering School,UST Beijing,Beijing 100083 2)Health Science Center,Peking University,Beijing 100083,China ABSTRACT Both the Stribeck curve and friction coefficient were mensurated before and after the La-DPPC was added into the HA lubricate system by pendulum friction apparatus.It was found that the system friction coefficient decreased sharply after La-DPPC was added.From the Stribeck curve,the lubricate mechanism of the lubricate system could change from the mix lubricate to the liquid film and mix lubricate.It is speculated that the interface characteristic must be changed because of La-DPPC.In order to prove this speculation,sur- face tension was tested when La-DPPC was added into the HA lubricate system,and an analysis of IR spectra was done on La-DPPC.The results show that La-DPPC has hydrophilic and hydropholic characteristics, and acts as a surface active agent in lubricant,which decreases surface tension greatly.This contributes to film formation in the system and increases lubricate effect. KEY WORDS La-DPPC:surface tension;artificial synovia;lubricate capability (上接第632页) Optimization of Axial Symmetrical FGM Using the Genetic Algorithm ZHANG Xiaodan,WANG Sangiang,LIU Dongqing Applied Science School,UST Beijing.Beijing 100083,China ABSTRACT The distribution of thermal stresses for an empty cylinder of Functionally Graded Materials (FGM)with axial symmetry is obtained,and the Genetic Algorithm(GA)is applied to the optimization prob- lem of material composition for an empty cylinder of FGM with axial symmetry.Based on the thermal elasti- city theory and computational method,the numerical calculations are made using a genetic algorithm.The minimum thermal stresses and optimum combination are obtained for an empty cylinder of FGM. KEY WORDS functionally graded material (FGM);thermal stress;genetic algorithm;chromos-ome. 6 5 0 - 北 京 科 技 大 学 学 报 2 0 0 2 年 第 6 期 体系 的成膜性能 , 使 润滑剂 的润滑机制发 生改 变 , 摩擦系数降低 . 参 考 文 献 1 M u r a k am i T, Hi g a k i H , S aw ae Y, e t a l . A dap ti v e m u l ti - m o d e l ub r i e at i o n i n n a t r al s y on v i a l j o i nt s an d art i if c i a l j o int s [J ] . P r o c I n s ht M e e h E n g r s , 1 9 9 8 , 2 12 : 2 3 2 D o w s on D , W r 1hgt V Iin r o d u ct i o n ot ht e B i o m e e h an i e s o f J o iin s an d J o int eR P l a e e m e n t [M ] . L o n d o n : M E P, 1 9 8 1 . 1 3 9 3 王丽 , 高瑾 , 李久 青 . 聚 乙烯 醇水凝胶 人工 软骨润 滑 体 系研究 [J] . 云南 大学学报 ( 自然 科学版 ) , 2 0 02 , 2 4( :1) 3 0 9 4 虞路清 , 李久青 . 复合 人工 滑液 的流变 性能 及润滑 机 制 分析 [J ] . 北京 科技 大学学 报 , 2 00 1 , 2 3 ( 4 ) : 3 3 2 5 M ur a k a m i T, S aw ae 丫 Th e ad atP i v e m u l ti m o d e l u bir e a - ti o n i n kn e e P r o s ht e s e s w iht art i if e i a l c a rt i l a g e d u r l gn w a l - ki n g [A ] . D o w s o n D . E l a s ot h y d r o d yn am i e s ’ 9 6 [C ] . E l s e - v i e r S e i e n e e B V, 19 9 7 . 3 7 1 6 oT s hi m i t s u oy ok b o r i A , 1泊k a s h i K aw ha ar ad a . M e e h an i e a l t e s t m e ht o d o n ht e e s t im at i o n o f het lub r i e ant P e r fo mr an e e by 场a l uor n i e a e i d [J] . B i o 一 M e di e a l M aet ir a l s an d E n g i n - e e r i飞 , 19 9 5 , 5 ( 2 ) : 1 1 7 7 朱 步瑶 , 赵 振 国 . 界 面化学 基础 【M ] . 北京 : 化学工 业 出版社 , 19 9 6 . 7 4 I n fl u e n c e o f A rt iif c i a l S y n o v i a b y L a 一 D P P C o n L ub r i c a t e C ap ab ili yt 恻刃G iL )] , GA O inJ “ , LI iJ qu i gn “ , L 口 U iqS ua n)z 1) M at e r i a l S e i e n e e an d Eng i n e e ir ng S e h o o l , U S T B e ij in g , B e ij in g 10 0 0 8 3 2 ) H e a hlt S e i e n c e C e nte ` P e k i n g nU i v e r s ity, B e ij ign 10 0 0 8 3 , C h in a A B S T R A C T B o ht ht e S tr ib e c k c u r V e an d fr i e t i o n e o e if c i e flt w e r e m e n s itr at e d b e of r e a n d a ft e r ht e L a 一 D P P C w a s a d d e d int o ht e H A lub ir e at e sy s t e m b y P e n du l um fr i e t i o n a PP ar a t u s . 1 w a s of un d ht at ht e s y s t e m fr i e t i o n e o e if e i e nt d e e r e a s e d s h a rp l y a ft e r L a 一 D P P C w a s a d d e d . F r om ht e S tr ib e e k e ivtr e , ht e lub r i e a t e m e c ha n i sm o f ht e lub r i e at e s y s t e m c o u ld c h a n g e fr o m ht e m i x lub r i c at e t o ht e liq Ui d if lm an d m i x lub r i e at e . It i s s P e e u l at e d ht at ht e int e r fac e e h ar a e t e r i s t i e mu s t b e e h an g e d b e e au s e o f L a 一 D PP C . I n o r d e r t o P r o v e ht i s s Pe c u l at i o n , s ur - af e e t e n s i o n w a s et s t e d w he n L a 一 D PP C w a s a d d e d int o ht e H A lub r i c at e sy s t e m , a n d an an a ly s i s o f IR s P e e t r a w a s d on e o n L a 一 D PP C . hT e r e s u it s s h o w ht at L a 一 D P PC h a s 师dr o Ph ili e a n d 师dr o Ph o li e e h ar a e t e r i s t i e s , an d a e t s a s a s ur fa e e a e t i v e ag e nt i n 】u b r i e a n t , w h i c h d e e r e a s e s s ur fa c e t e n s i o n gr e at ly . T h i s c o ll t r ibut e s t o if lm fo mr at i o n i n ht e s y s t e m an d i n c r e a s e s lub r i e at e e fe e t . K E Y W O R D S L a 一 D PP C ; s itr fa c e t e n s i o n ; art iif c i a l s y n o v i a ; l u b r i e at e c ap ab iliyt (上接第 6 3 2 页) O P t im i z a t i o n o f A x i al S y m m e tr i e a l F G M U s i n g ht e G e n e ti c A l g o r iht m Z 子了理刀G iX a o da n , 不了乙理刃G aS qn ia gn, IL U D o刀 g甘“ 29 A P li e d S c i e n e e S e h o o l , U S T B e ij in g , B e ij i n g 10 0 0 83 , Ch i n a A B S T R A C T Th e d i s tr ib ut i o n o f ht e rm a l s tr e s s e s of r an e n 1P ty e y ll n d e r o f F un c t ion a l ly rG ad e d M at e r i a l s ( F G M ) w iht ax i a l s y nu e try 1 5 o bt a i n e d , an d ht e G e n e t i e A l g o r lt】l m (G A ) 1 5 ap Pli e d t o ht e o P t加i z at i o n P or b - l e m o f m at e r i a l e o n 1P o s it i o n fo r an e m Pyt c y lidn e r o f F G M w iht ax i al s y m e tyr . B a s e d o n ht e t h e mr a l e l a s t i - e iyt ht e o yr an d c o l n p ut at i o n a l m e t h o d , ht e nut e r i c a l c a l e u lat i o n s ar e m a de u s ign a g e n e t i e a l g o r it l l ll l . T h e m in im um ht e mr a l s tr e s s e s an d o Pt im um e o n l b i n at i o n ar e o b t a in e d fo r an e ll l P yt e y lin d e r o f F G M . K E Y W O R D S if l门c ti o n a lly g r a d e d m at e r i a l ( F G M ) : ht e mr a l s tr e s s : g e n e t i e a lg o r lthn l ; c hr o m o s 一 o m e