Contact stress and sliding wear damage tolerance of hydroxyapatite and carbon nanotube reinforced polyethylene cup liner against zirconia femoral head.
J Mech Behav Biomed Mater
; 136: 105435, 2022 12.
Article
em En
| MEDLINE
| ID: mdl-36244327
ABSTRACT
A finite element modeling (FEM) approach is carried out to estimate the contact stresses such as von-Mises and shear stress on the acetabular cup liner, made up of ultra-high molecular weight polyethylene (UHMWPE)-hydroxyapatite (HAp)-carbon nanotubes (CNT) based composites. The highlights of this work include the effects of liners' material (UHMWPE-HAp-CNT composites), radial clearance (0.05 to 1â¯mm), and liners' wall thickness (3 to 8â¯mm) on contact stresses. The thick liner (thickness 8â¯mm) with conformal geometry (radial clearance 0.05â¯mm) produced the lowest contact stresses (von-Mises 13.8-17.5â¯MPa and shear stress 2.3-3.3â¯MPa). In contrast, the thin liner (thickness 3â¯mm) with higher radial clearance (1â¯mm) showed the highest von-Mises stress (78.6-131.0â¯MPa) and shear stress (17.0-23.3â¯MPa). According to ISO 7206-1, nearly 6-7 times reduced contact stresses were observed because of the wider articulating contact area provided by thick cup liner and its conformity with respect to the femoral head. The UHMWPE-2 wt % CNT composite (UC) showed low von-Mises stress (16.1â¯MPa) and lowest shear stress (2.3â¯MPa); thus, it is the most damage tolerant material (wear rate 2.6â¯×â¯10-7 mm3/Nm). The excellent mechanical properties such as hardness (165â¯MPa), elastic modulus (2.28â¯GPa), and tensile strength (36.7â¯MPa) are reasoned to elicit an increased sliding-wear resistance of UC. Thus, CNT-based UHMWPE composite can be the potential acetabular cup liner with a thickness of 8â¯mm and clearance of 0.05â¯mm without plastic deformation.
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En
Ano de publicação:
2022
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Article