FINITE ELEMENT ANALYSIS OF A STEEL POST INSERTED IN POLYMER CYLINDER UNDER PULL-OUT AND TORQUE LOADINGS

Document Type : Original Article

Authors

1 Professor, Dpt. of Technology, Institut Préparatoire aux Etudes d’Ingénieurs de Sfax, Sfax, Tunisia.

2 Associate professor, Dpt. of Technology, Institut Préparatoire aux Etudes d’Ingénieurs de Sfax, Sfax, Tunisia.

3 Professor, Dpt. of Mech., Ecole Polytechnique de Montréal, Montréal, Canada.

4 Graduate student, LASEM, Ecole Nationale d’Ingénieurs de Sfax, Tunisia.

Abstract

ABSTRACT
Posts are used in various implant designs to contribute to the short- and long- term
fixation stability of artificial joints. This study was undertaken to provide further
information on the effect of torque loading on the pull-out response of steel post
inserted in polymer material. 3 D finite element analysis, using ABAQUS program, were
developed on metallic post inserted in polymer cylinder with initial interference under
pull-out, torque and combined torque/pull-out loadings. For the polymer cylinder
materials we have considered a High Density Polyethylene (HDPE) cylinder with well
known mechanical and tribological properties. The predicted ultimate pull-out force
undergoes non linear decrease as the applied torque increases. The important
decreasing rate was observed when the applied torque exceeded 25 % of the ultimate
torque. The radial and shear stresses are significantly changed under pull-out and the
combined pull-out/torque forces. The finite element prediction corroborate with our
recently experimental results developed on HDPE material. The predicted results of
post inserted in polyethylene materials can, therefore, demonstrate the effect of torque
loading on the pull-out force.

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