Analiza preostale čvrstoće oštećene totalne proteze kuka

master's thesis

• Title (english): Residual strength assessment of a damaged total hip prosthesis
• Author: Milena Babić
• Mentor: Željko Božić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-01-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Životni vijek olabavljene femuralne komponente totalne proteze kuka je razmatran za opterećenja propisana ISO 7206-4 standardom te za opterećenja koja se pojavljuju tijekom normalnog hoda čovjeka, korištenjem metode konačnih elemenata. Primijenjen je proces povratnog inženjerstva, pri čemu je CAD model totalne proteze kuka dobiven pomoću 3D skeniranja. Na temelju dobivenog CAD modela, razvijen je FEM model. Provedene su analize metodom konačnih elemenata za dobiveni FEM model femuralne komponente totalne proteze kuka ugrađen u model koštanog cementa i zbite (kortikalne) kosti. Rezultati analize su pokazali da se najveće vrijednosti vlačnih naprezanja pojavljuju na posterior-lateralnoj strani gornjeg dijela tijela femuralne komponente, gdje se u stvarnim slučajevima iniciraju zamorne pukotine. Modelirana je odgovarajuća pukotina na temelju dobivenih rezultata i površine po kojoj propagiraju pukotine u stvarnim slučajevima. Razmatrano je nekoliko duljina pukotine te su za svaku od njih utvrđene vrijednosti koeficijenta intenzivnosti naprezanja.

Abstract (english)

Fatigue life of a loosened femoral component of the total hip prosthesis was considered for the loads based on the standard ISO 7206-4 and loads which occur due to normal human walking, by using finite element method. A reverse engineering procedure was implemented, where the CAD model of a total hip prosthesis was created by means of 3D scanning. By using the obtained CAD model, the FEM model was developed. Finite element analyses were performed for the obtained FEM model of the hip prosthesis implanted in cement and bone. The analyses showed that high tensile stresses occur on posterior-lateral side of the upper part of the femoral shaft, where fatigue cracks occur in real cases. Based on the analyses results and fracture surface from the real cases, a corresponding crack was modelled on the femoral component model. Several crack depths were considered and for each of them stress intensity factor values were obtained.

• Keywords: Procjena životnog vijeka; metoda konačnih elemenata; mehanika loma; povratno inženjerstvo; 3D skeniranje; totalna proteza kuka
• Keywords (english): Fatigue life assessment; finite element analysis; fracture mechanics; reverse engineering; 3D scanning; total hip prosthesis
• Language: english
• URN:NBN: urn:nbn:hr:235:724874
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2021-1-16
• Created on: 2019-05-21 12:55:53