Judul/Title Numerical Convergence in Wear Volume Prediction of UHMWPE Acetabular Cup Paired with cp Ti Femoral Head Hip Implants
Penulis/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)
Tanggal/Date 12 2020
Kata Kunci/Keyword
Abstrak/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.
Rumpun Ilmu Teknik Mesin (dan Ilmu Permesinan Lain)
Bahasa Asli/Original Language English
Level Internasional
Dokumen Karya
No Judul Tipe Dokumen Aksi
1KEM_867_148 2020 Numerical Convergence in Wear Volume Prediction of UHMWPE Acetabular Cup Paired with cp Ti Femoral Head Hip Implants.pdfBukti Published
2Numerical convergence.pdf[PAK] Full Dokumen
3Numerical 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[PAK] Cek Similarity