A Morlet wavelet signal analysis with a Daubechies filter for the wear assessment of hip prostheses coated with diamond-like carbon by triboadhesion.
In the present work, based on high frequency wavelet analysis of dynamic signals of mechanical systems, a multiple-resolution wavelet analysis is carried out, to the signal obtained from an accelerometer mounted on the structure of a hip prosthesis wearing test device. The prostheses employed had a femoral head made of aluminum oxide and the acetabular cup of ultra-high-molecular-weight polyethylene. The first two aluminum oxide femoral heads were coated with diamond-like carbon and a third one was tested without coating and used as a reference. The coating was carried out by triboadhesion. Tests results showed that maximum vibration amplitude reached after 32 hr for the coated prostheses was 0.2 g. The noncoated prosthesis amplitude presented was 0.75 g in the same time interval. These values were attributed to wear damage on the surface of the prostheses, indicating that thin film DLC coating caused an increase of stiffness on the surface and therefore an increase in wear resistance approximately of 314%.
Rodríguez-Lelis
Jose Maria
JM
El Departamento de Ingeniería Mecánica, Centro Nacional de Investigación y Desarrollo Tecnológico, Cuernavaca, Morelos, Mexico.
Mata
Dagoberto Tolosa
DT
Vargas-Treviño
Marciano
M
Navarro-Torres
Jose
J
Piña-Piña
Gilberto
G
Abundez-Pliego
Arturo
A
D000537:Aluminum Oxide / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D018130:Diamond; D019544:Equipment Failure Analysis / Q000379:methods*; D005270:Femur Head; D005374:Filtration / Q000295:instrumentation; D006244:Hardness; D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing / Q000379:methods; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012815:Signal Processing, Computer-Assisted; D013499:Surface Properties; D014732:Vibration
D020099:Coated Materials, Biocompatible; D002244:Carbon; D018130:Diamond; D000537:Aluminum Oxide