Computational study on thermal effects of coil-based implantable magnetic stimulation using finite element analysis

2013 ◽  
Author(s):  
Heejin Park ◽  
Sohee Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Effects ◽  
Magnetic Stimulation ◽  
Computational Study ◽  
Element Analysis

scholarly journals Finite Element Analysis of Thermal Effects in Diode End-Pumped Solid-State Lasers

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Moustafa Sayem El-Daher
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solid State ◽  
Thermal Effects ◽  
Beam Quality ◽  
Focal Length ◽  
Thermal Lensing ◽  
Solid State Lasers ◽  
Element Analysis ◽  
Composite Crystals

Thermal effects are the main obstacle to getting high power and good beam quality in diode end-pumped solid-state lasers. In this work, a theoretical investigation of thermal effects in single and dual end-pumped solid-state lasers is carried out using finite element analysis (FEA) for a selected number of widely used laser producing materials, namely, Nd:YAG, Yb:YAG, and Nd:KGW. Crystals with different dimensions are also investigated both in single and in dual end-pumped configuration. Finally, the effect of using composite crystals on thermal lensing is investigated. An experiment to measure the thermal focal length for two different crystals was carried out and a comparison with FEA computed focal length of the thermal lens is made. In all cases studied in this work, results show clear effects of thermal lensing with some differences depending on crystal type, pump power, and size.

scholarly journals A Finite Element Modeling and Simulation of Human Temporomandibular Joint with and Without TM Disorders: An Indian Experience

2021 ◽  
Vol 8 (3) ◽  
pp. 347-355
Author(s):  
Mehak Sharma ◽  
Manoj Soni
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Temporomandibular Joint ◽  
Computational Study ◽  
3D Models ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Stress Studies ◽  
Jaw Joint ◽  
Von Mises

Temporomandibular joint (TMJ) is anatomically the most intricate joint which connects the lower jaw to the upper jaw and regulates jaw movements. It significantly deals with mastication and speech. It is hence imperative to study the mechanics and functioning of the jaw joint to devise alternative solutions for its replacement whenever required. Further, human skulls are anthropologically categorized into three types – African, Asian and European. Out of these, the Indian skull is also a bit different than its Asian counterparts because of its osteology and skeletal biology. Hence, a comprehensive biomechanical and computational study is essential to provide customized solutions. For the present study, four different loading conditions are selected to perform finite element analysis on the human skull, Anonymized and unidentifiable CT scan data sets from open-source web platforms are converted to STL and then 3D models using 3D slicer. Finite element analysis of jaw joint is carried out. Results based on Von Mises stress studies show significant behavioral differences under varying load conditions. Hence, it is crucial to identify solutions for TMJ disorders of the Indian population.

scholarly journals Influence of the Acetabular Cup Material on the Shell Deformation and Strain Distribution in the Adjacent Bone—A Finite Element Analysis

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1372
Author(s):  
Danny Vogel ◽  
Matthias Klimek ◽  
Michael Saemann ◽  
Rainer Bader
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Distribution ◽  
Computational Study ◽  
Biomechanical Properties ◽  
Acetabular Cup ◽  
Element Analysis ◽  
Liner Material ◽  
Press Fit ◽  
Potential Risk Factors

In total hip arthroplasty, excessive acetabular cup deformations and altered strain distribution in the adjacent bone are potential risk factors for implant loosening. Materials with reduced stiffness might alter the strain distribution less, whereas shell and liner deformations might increase. The purpose of our current computational study was to evaluate whether carbon fiber-reinforced poly-ether-ether-ketones with a Young´s modulus of 15 GPa (CFR-PEEK-15) and 23 GPa (CFR-PEEK-23) might be an alternative shell material compared to titanium in terms of shell and liner deformation, as well as strain distribution in the adjacent bone. Using a finite element analysis, the press-fit implantation of modular acetabular cups with shells made of titanium, CFR-PEEK-15 and CFR-PEEK-23 in a human hemi-pelvis model was simulated. Liners made of ceramic and polyethylene were simulated. Radial shell and liner deformations as well as strain distributions were analyzed. The shells made of CFR-PEEK-15 were deformed most (266.7 µm), followed by CFR-PEEK-23 (136.5 µm) and titanium (54.0 µm). Subsequently, the ceramic liners were radially deformed by up to 4.4 µm and the polyethylene liners up to 184.7 µm. The shell materials slightly influenced the strain distribution in the adjacent bone with CFR-PEEK, resulting in less strain in critical regions (<400 µm/m or >3000 µm/m) and more strain in bone building or sustaining regions (400 to 3000 µm/m), while the liner material only had a minor impact. The superior biomechanical properties of the acetabular shells made of CFR-PEEK could not be determined in our present study.

scholarly journals Effects of Stem Malalignment in Cementless Hip Arthroplasty: a Computational Study

2018 ◽  
Vol 7 (4.27) ◽  
pp. 137
Author(s):  
Abdul Halim Abdullah ◽  
Nik M. Mohsien ◽  
Muhammad Syahmi Yusof ◽  
Nabila Aznan ◽  
Shahrul Hisyam Marwan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Hip Arthroplasty ◽  
Computational Analysis ◽  
Computational Study ◽  
Implant Loosening ◽  
Total Deformation ◽  
Element Analysis ◽  
Cementless Hip Arthroplasty

Implant loosening and deformation issues contribute to the instability of the hip arthroplasty. Prosthesis stem malalignment can occur in varus, anteversion and retroversion in different degrees due to several reasons. In this study, computational analysis of cementless hip arthroplasty with different stem malalignment cases was conducted to investigate the biomechanical effects in hip arthroplasty. Five hip arthroplasty models were developed using finite element analysis which are straight/aligned model, malalignment models at varus +3°, varus -3°, sagittal flexed +3°, and sagittal extended -3°. Results show that different pattern of stress distribution was observed in each malalignment case. The varus -3° malalignment model had demonstrated the greatest risk of failure based on the resulting stress distribution and total deformation.   

Finite Element Analysis of Thermal Effects on Brazed Cold Diamond Grit

2015 ◽  
Vol 68 (5) ◽  
pp. 829-838 ◽  
Author(s):  
Fanling Meng ◽  
Aiguo Liu ◽  
Huanhuan Sun ◽  
Mianhuan Guo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Effects ◽  
Element Analysis ◽  
Diamond Grit
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