Fracture mechanisms in carbon fibre reinforced poly(ether ether ketone). II: Material variables

Composites ◽  
1991 ◽  
Vol 22 (3) ◽  
pp. 251
Keyword(s):  
Carbon Fibre ◽  
Fracture Mechanisms ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone

Tribological assessment of a flexible carbon-fibre-reinforced poly(ether—ether—ketone) acetabular cup articulating against an alumina femoral head

2008 ◽  
Vol 222 (3) ◽  
pp. 273-283 ◽  
Author(s):  
S C Scholes ◽  
I A Inman ◽  
A Unsworth ◽  
E Jones
Keyword(s):  
Wear Rate ◽  
Carbon Fibre ◽  
Acetabular Component ◽  
Volumetric Wear ◽  
Wear Rates ◽  
Lubrication Regime ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Low Wear

New material combinations have been introduced as the bearing surfaces of hip prostheses in an attempt to prolong their life by overcoming the problems of failure due to wear-particle-induced osteolysis. This will hopefully reduce the need for revision surgery. The study detailed here used a hip simulator to assess the volumetric wear rates of large-diameter carbon-fibre-reinforced pitch-based poly(ether—ether—ketone) (CFR-PEEK) acetabular cups articulating against alumina femoral heads. The joints were tested for 25×106 cycles. Friction tests were also performed on these joints to determine the lubrication regime under which they operate. The average volumetric wear rate of the CFR-PEEK acetabular component of 54 mm diameter was 1.16 mm3/106 cycles, compared with 38.6 mm3/106 cycles for an ultra-high-molecular-weight polyethylene acetabular component of 28 mm diameter worn against a ceramic head. This extremely low wear rate was sustained over 25×106 cycles (the equivalent of up to approximately 25 years in vivo). The frictional studies showed that the joints worked under the mixed—boundary lubrication regime. The low wear produced by these joints showed that this novel joint couple offers low wear rates and therefore may be an alternative material choice for the reduction of osteolysis.

An Estimation of Fatigue Life for a Carbon Fibre/Poly Ether Ether Ketone Hip Joint Prosthesis

1995 ◽  
Vol 209 (2) ◽  
pp. 93-103 ◽  
Author(s):  
M Akay ◽  
N Asian
Keyword(s):  
Fracture Mechanics ◽  
Carbon Fibre ◽  
Flexural Modulus ◽  
Three Dimensional ◽  
Fibre Length ◽  
Element Analysis ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Three Dimensional Finite Element

A fracture mechanics approach was applied to estimate the life of a prosthesis injection moulded from short carbon fibre reinforced poly ether ether ketone. Flexural modulus and strength, fracture toughness, fatigue endurance limit, fatigue crack growth rate and threshold stress intensity factor were determined. The dimensions of the test pieces were selected to yield fibre orientation and fibre length distributions similar to those obtained in the prosthesis. Stress levels generated in the prosthesis under different activities were estimated by conducting three-dimensional finite element analysis. It was shown by a fracture mechanics approach that a fatigue failure due to the propagation of an embedded elliptical slit, under these stresses, would be unlikely for a crack length smaller than 1.85 mm. However, the cement would fail under the same conditions, irrespective of the type of the prosthesis employed.

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