| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
|
|---|
| Outline of Final Research Achievements |
A hip prosthesis is designed to be modular, so that there is an interface of two solids where they contact, e.g., the bearing surface consists of a liner and the femoral head or the taper junction between a femoral stem and a head ball. Recently, it has been reported that release of metal ions from these interfaces caused the serious adverse reactions in the patients' body. The main mechanism was supposed the fretting corrosion. The present study aimed to investigate the effects of friction stroke length under reciprocating motion on damage and restoration of the passive film on the interface of contacting flat surfaces of CoCr alloy.
As the results of electrical sensing of ion release from the metal surfaces, friction with short strokes can cause damage to the passive film with plastic deformation. Friction with long stroke shortens the restoration time because of mechanical activation of the surface.
|
