SIMULASI KONTAK PADA SAMBUNGAN TULANG PINGGUL BUATAN MENGGUNAKAN METODE ELEMEN HINGGA

Abstract

ABSTRACT Hip joint is one of the most vulnerable injury joint due to high load. The widely used materials are cobalt chromium alloy (CoCr) and ultra-high molecular weight polyethylene (UHMWPE). However, the failure of the system are still common. Failure on the artificial hip joint can be caused by the medical aspect and the tribological aspect. The tribological aspects, such as wear or instability of the system, can be caused by the design. This research would taken case the contact between the acetabular cup (UHMWPE) and femoral head (CoCr) on the artificial hip joint. This study aims to analyze the design effect such as acetabular cup thickness and material properties of the contact pressure distribution. Contact pressure distribution influence on the wear and stability of the system. Contact analysis was carried out using the finite element method with the helping of ABAQUS 6.5 software. CoCr considered as linear elastic material, while UHMWE considered as linear viscoelastic material. Contact was assumed frictionless. Load was given at the midpoint of the femoral head abaut 2500 N and held for 300 seconds. From the results, obtained the thicker acetabular cup, the maximum contact pressure will be increase that was about 5%. Conversely, the thicker acetabular cup, the contact radius will decrease which was around 7%. Viscoelastic properties may cause creep. Contact pressure will gradually decrease over the times. Contact radius will gradually increase over the time.