FEM wear prediction of ceramic hip replacement bearings under dynamic edge loading conditions
Date22nd Feb 2024
Time03:00 PM
Venue MDS 412 Seminar Hall, Machine Design Section, New Rummy Game
PAST EVENT
Details
Hard-on-Hard bearings like Metal-on-Metal (MoM) and Ceramic-on-Ceramic (CoC) tribo-pairs have been widely employed in Total Hip Replacement (THR) procedures to limit wear debris formation. This reduced wear debris formation makes them suitable for younger patients, lowering the number of revision surgeries and improving implant longevity. Among the hard material pairs, ceramic tribo-pair specifically have produced the highest in-vivo wear resistance, biocompatibility, superior corrosion resistance, and high fracture toughness. However, this ceramic tribo-pair suffers from edge loading, sharply increasing wear and accelerating early implant failures due to micro-separation. Even though in-vitro studies have tested the occurrence of wear due to dynamic edge loading, the Finite Element Method (FEM) gives the advantage of accurately estimating the wear, minimizing the experimental time and cost. A new fundamental FEM model is developed to predict wear for ceramic hip replacement bearings under dynamic edge loading conditions for a fixed separation and fixed inclination angle. The model is directly validated with the existing hip simulator data up to 3 million cycles in terms of wear depth, wear scar and volumetric wear rate. The results from the model show that the accuracy in wear prediction was more than 98% for the wear depth and volumetric wear rate for the dynamic edge loading condition. A stripe wear scar is captured, depicting the edge loading conditions. The developed model from this study can predict wear under pure standard and dynamic edge loading conditions.
Speakers
Mr. NITISH PRASAD K (ME19D408)
Department of Mechanical Engineering