TY  - JOUR
A1  - Banihani, Suleiman
A1  - Rabczuk, Timon
A1  - Almomani, Thakir
T1  - POD for real-time simulation of hyperelastic soft biological tissue using the point collocation method of finite spheres
JF  - Mathematical Problems in Engineering
N2  - The point collocation method of finite spheres (PCMFS) is used to model the hyperelastic response of soft biological tissue in real time within the framework of virtual surgery simulation. The proper orthogonal decomposition (POD) model order reduction (MOR) technique was used to achieve reduced-order model of the problem, minimizing computational cost. The PCMFS is a physics-based meshfree numerical technique for real-time simulation of surgical procedures where the approximation functions are applied directly on the strong form of the boundary value problem without the need for integration, increasing computational efficiency. Since computational speed has a significant role in simulation of surgical procedures, the proposed technique was able to model realistic nonlinear behavior of organs in real time. Numerical results are shown to demonstrate the effectiveness of the new methodology through a comparison between full and reduced analyses for several nonlinear problems. It is shown that the proposed technique was able to achieve good agreement with the full model; moreover, the computational and data storage costs were significantly reduced.
KW  - Chirurgie
KW  - Finite-Elemente-Methode
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170413-31203
ER  - 
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  -