• Title/Summary/Keyword: wear debris

Search Result 132, Processing Time 0.053 seconds

Friction and wear characteristics during sliding of ${ZrO}_{2}, {Si}_{3}{N}_{4}$ and SiC with SiC, AISI 4340 and bronze under dry and lubricated condition (세라믹 ${ZrO}_{2}, {Si}_{3}{N}_{4}$ 및 SiC를 SiC, AISI 4340 및 청동으로 윤활 및 건조조건에서 미끄름시험하였을 때의 마찰 및 마멸 거동)

  • 강석춘
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.13 no.3
    • /
    • pp.404-410
    • /
    • 1989
  • Friction and wear tests were conducted with several different ceramics sliding against ceramic and metal couples with and without lubricant in a two disk type sliding machine. The purpose was to know the tribological properties of ceramics. With very different physical and chemical properties of ceramics compared to metal, the tribological properties of ceramics should be defined in detail. Among them, the wear and friction with same or different couple is very important. Also the lubrication of ceramic is one of the major area to be studied. From this research, SiC, SI$_{3}$N$_{4}$ and ZrO$_{2}$ were slid against SiC, AISI 4340 and bronze under various sliding condition. It was found that the friction and wear of ceramics are strongly dependent on the sliding condition. For unlubricated sliding against SiC, ZrO$_{2}$ shows low wear and friction coefficient over wide lange of load, but with lubricated sliding, SiC shows better performance whatever lubricants were used. Also the effect of lubricant depended upon the material properties of sliding pairs. The general tribological properties of ceramics were not correlated with chattering and noise at low load but it could be reduced or avoided effectively by using lubricants. SiC and Si$_{3}$N$_{4}$ slid against SiC have transition from mild to severe wear at high load but ZrO$_{2}$-SiC and SiC-steel have not. Wear debris formed on the contact area of SiC couples was main cause of the initiation of transition. At high speed, only ZrO$_{2}$ sliding against SiC has transition of wear by low thermal conductivity.

Finite Element Analysis for the Contact Stress of Ultra-high Molecular Weight Polyethylene in Total Knee Arthroplasty (전 슬관절 치환 성형술에 사용되는 초고분자량 폴리에틸렌 삽입물의 접촉응력에 관한 유한요소해석)

  • Jo, Cheol-Hyeong;Choe, Jae-Bong;Choe, Gwi-Won;Yun, Gang-Seop;Gang, Seung-Baek
    • Journal of Biomedical Engineering Research
    • /
    • v.20 no.1
    • /
    • pp.37-44
    • /
    • 1999
  • Because of bone resorption, wear of ultra-high molecular weight polyethylene(UHMWPE) in total knee arthroplasty has been recognized as a major factor in long-term failure of knee implant. The surface damage and the following harmful wear debris of UHMWPE is largely related to contact stress. Most of the previous studies focused on the contact condition only at the articulating surface of UHMWPE. Recently, contact stress at the metal-backing interface has been implicated as one of major factors in UHMWPE wear. Therefore, the purpose of the is study is to investigate the effect of the contact stress for different thickness, conformity friction coefficient, and flexion degree of the UHMWPE component in total knee system, considering the contact conditions at both interfaces. In this study, a two-dimensional non-linear plane strain finite element model was developed. The results showed that the maximum value of von-Mises stress occurred below the articulating surface and the contact stress was lower for the more conforming models. All-polyethylene component showed lower stress distribution than the metal-backed component. With increased friction coefficient on the tibiofemoral contact surface, the maximum shear stress increased about twofold.

  • PDF