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Title : Numerical Convergence in Wear Volume Prediction of UHMWPE Acetabular Cup Paired with cp Ti Femoral Head Hip Implants
Author :

Dr. Handoko, S.T., M.T. (1) Dr. Suyitno, S.T., M.Sc. (2) Ir. Rini Dharmastiti, M.Sc., Ph.D., IPM., ASEAN Eng. (3) dr. Rahadyan Magetsari, Sp.OT(K)., FICS., Ph.D. (4)
Date : 12 2020
Keyword : Wear prediction, UHMWPE, cp Ti, hip implant, numerical convergence Wear prediction, UHMWPE, cp Ti, hip implant, numerical convergence
Abstract : Wear is a problem for metal on polymer (MOP) hip implants to perform lifetime endurance. Polymer excessive volumetric loss leads to implant failures. Attempts to solve this problem are usually initiated with tribological tests. The method is time-consuming because the sliding speed is low. There is a faster way to use a computational method to gather wear data. This research aims to investigate the numerical convergence of predicted wear volume with the finite element method (FEM). The model is a commercially pure titanium (cp Ti) and ultra-high molecular weight polyethylene (UHMWPE) MOP hip implant. A dynamic Paul physiological load was applied to the model. Volumetric loss of the polymer was calculated with a wear equation involved nonlinear contact load and contact area. The inputs of calculation are wear factor and the computational contact mechanic performed by FEM. The wear factor was obtained by performing biotribological experiments with a multidirectional pin on disc tribotest. Predicted wear volume was validated with hip simulator experimental data from the literature. Convergences were found at the mesh density of 1.38 elements/mm3. An acceptable numerical error was obtained in the model with 1 mm element size for femoral head and 0.3 mm for acetabular cup. This model was then used for the investigation of load increment effects. The result is that load increment variations do not affect wear volume and contact mechanic numerical outputs. The calculated stresses are below the UHMWPE yield stress limit. In this elastic region, the effects of strain rate caused by load increment are negligible.
Group of Knowledge : Teknik Mesin (dan Ilmu Permesinan Lain)
Original Language : English
Level : Internasional
Status :
Published
Document
No Title Document Type Action
1 KEM_867_148 2020 Numerical Convergence in Wear Volume Prediction of UHMWPE Acetabular Cup Paired with cp Ti Femoral Head Hip Implants.pdf
Document Type : Bukti Published
Bukti Published View
2 Numerical convergence.pdf
Document Type : [PAK] Full Dokumen
[PAK] Full Dokumen View
3 Numerical Study on the Effects of Coefficient of Friction to the Dynamic Sliding Contact between Bearing and Talar Components of Metal on Polymer Total Ankle Replacement Implants (1).pdf
Document Type : [PAK] Cek Similarity
[PAK] Cek Similarity View