10-11-2012, 02:03 PM
Resident Basic Science Conference
Resident Basic Science Conference.pdf (Size: 384.73 KB / Downloads: 40)
WEAR
Adhesive - transfer film
Boundary Lubrication
Abrasive - small wear particles
2 and 3 body
Fluid Film Lubrication
Fatigue - subsurface cracks
(Rolling) large particles
delamination, pitting
Cobalt – Chromium Alloys
ASTM F75 - cast Vitallium
Large grain size
- “Hipped” small grain size
F90 - cold worked Wrought Co-Cr
F562 - forged, 35% Ni Multiphase MP35N
F799 - forged, 15% Tu
F1537 - wrought
Polymethylmethacrylate - PMMA
Modulus 1800 MPa (ISO Min.)
Compressive Strength 70 MPa (ASTM/ISO Min.)
Bending Strength 50 MPa (ISO Min.)
Tensile Strength 25 MPa
Higher Molecular Weight Higher material Properties
Co-Polymers have Better Material Properties