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Fatigue behaviour of porous polysulphone surface coatings for orthopaedic applications |
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| Authors: | N.B. Beals D.L. McDowell M. Spector |
| Affiliation: | a Mr. N. Beals is currently with the Richards Medical Company (1450 Brooks Road, Memphis, TN 38116, USA b Dr. D.L. McDowell is with the Department of Mechanical Engineering at the Georgia Institute of Technology, Atlanta, USA c Dr M. Spector is with the Department of Orthopaedics at the Emory University School of Medicine, Atlanta, USA |
| Abstract: | Porous polysulphone (PPSF) has recently been selected as a candidate material for use as a prosthetic surface coating in orthopaedic applications to acommodate ‘bone ingrowth’ for fixation to the skeletal system. The tension-loaded fatigue behaviour of PPSF was characterized based on the interpretation of stress/life (S/N) data. Results of this investigation indicate that the fatigue life of PPSF is governed by crack propagation across the sintered necks of the porous structure. In addition, experimental data revealed that the fatigue strength-reduction factor, Kf, remains equivalent to the tensile notch strength-reduction factor for a wide range of fatigue lives. However, analytical results indicate that the material has a low notch sensitivity and that a single application of a theoretical elastic stress-concentration factor in a fatigue analysis would be inappropriate. |
| Keywords: | porous polysulphone fatigue triaxiality factor stress concentration |
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