TY  - JOUR
A1  - Ataollahi Oshkour, Azim
A1  - Talebi, Hossein
A1  - Seyed Shirazi, Seyed Farid
A1  - Bayat, Mehdi
A1  - Yau, Yat Huang
A1  - Tarlochan, Faris
A1  - Abu Osman, Noor Azuan
T1  - Comparison of various functionally graded femoral prostheses by finite element analysis
JF  - Scientific World Journal
N2  - This study is focused on finite element analysis of a model comprising femur into which a femoral component of a total hip replacement was implanted. The considered prosthesis is fabricated from a functionally graded material (FGM) comprising a layer of a titanium alloy bonded to a layer of hydroxyapatite. The elastic modulus of the FGM was adjusted in the radial, longitudinal, and longitudinal-radial directions by altering the volume fraction gradient exponent. Four cases were studied, involving two different methods of anchoring the prosthesis to the spongy bone and two cases of applied loading. The results revealed that the FG prostheses provoked more SED to the bone. The FG prostheses carried less stress, while more stress was induced to the bone and cement. Meanwhile, less shear interface stress was stimulated to the prosthesis-bone interface in the noncemented FG prostheses. The cement-bone interface carried more stress compared to the prosthesis-cement interface. Stair climbing induced more harmful effects to the implanted femur components compared to the normal walking by causing more stress. Therefore, stress shielding, developed stresses, and interface stresses in the THR components could be adjusted through the controlling stiffness of the FG prosthesis by managing volume fraction gradient exponent.
KW  - Finite-Elemente-Methode
KW  - Hüftgelenk
KW  - Funktioneller Gradientenwerkstoff
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170413-31194
ER  - 
TY  - JOUR
A1  - Talebi, Hossein
A1  - Zi, Goangseup
A1  - Silani, Mohammad
A1  - Samaniego, Esteban
A1  - Rabczuk, Timon
T1  - A simple circular cell method for multilevel finite element analysis
JF  - Journal of Applied Mathematics
N2  - A simple multiscale analysis framework for heterogeneous solids based on a computational homogenization technique is presented. The macroscopic strain is linked kinematically to the boundary displacement of a circular or spherical representative volume which contains the microscopic information of the material. The macroscopic stress is obtained from the energy principle between the macroscopic scale and the microscopic scale. This new method is applied to several standard examples to show its accuracy and consistency of the method proposed.
KW  - Finite-Elemente-Methode
KW  - Feststoff
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170426-31639
ER  -