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Finite element analysis

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https://www.readbyqxmd.com/read/28818322/stability-of-biodegradable-metal-mg-ca-zn-alloy-screws-compared-with-absorbable-polymer-and-titanium-screws-for-sagittal-split-ramus-osteotomy-of-the-mandible-using-the-finite-element-analysis-model
#1
Jee-Ho Lee, Hyung-Seop Han, Yu-Chan Kim, Jin-Yong Lee, Bu-Kyu Lee
Mg-Ca-Zn alloy has been suggested for the application of fixation materials during maxillofacial surgery. We investigated the stability of Mg-Ca-Zn alloy for clinical application during orthognathic surgery. The finite element model for the fixation of sagittal split ramus osteotomy was constructed. In the bicortical screw fixation of the mandible setback condition, the stress distributions of Mg-Ca-Za alloy, polylactic acid polymer, and titanium were evaluated using the virtual model with occlusal loading of 132 N...
July 4, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28816344/comparison-of-two-finite-element-modeling-solutions-for-biomechanical-simulation-using-a-case-study-of-a-mandibular-bone
#2
Yunfeng Liu, Ying-Ying Fan, Hui-Yue Dong, Jian-Xing Zhang
BACKGROUND: The method used in biomechanical modeling for finite element method (FEM) analysis needs to deliver accurate results. There are currently two solutions used in FEM modeling for biomedical model of human bone from CT images: one is based on a triangular mesh, and the other is based on the parametric surface model and is more popular in practice. MATERIALS AND METHODS: The outline and modeling procedures for the two solutions are compared and analyzed...
August 17, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28815378/effect-of-aging-on-mechanical-stresses-deformations-and-hemodynamics-in-human-femoropopliteal-artery-due-to-limb-flexion
#3
Anastasia Desyatova, Jason MacTaggart, Rodrigo Romarowski, William Poulson, Michele Conti, Alexey Kamenskiy
Femoropopliteal artery (FPA) reconstructions are notorious for poor clinical outcomes. Mechanical and flow conditions that occur in the FPA with limb flexion are thought to play a significant role, but are poorly characterized. FPA deformations due to acute limb flexion were quantified using a human cadaver model and used to build a finite element model that simulated surrounding tissue forces associated with limb flexion-induced deformations. Strains and intramural principal mechanical stresses were determined for seven age groups...
August 16, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28813844/soft-stop-knee-brace-for-rehabilitation-from-ligament-injuries-design-and-pilot-trial
#4
James R J Greenfield, Haram Francis Hwang, Claire Davies, Andrew J McDaid
Ligaments within the human knee are commonly torn or injured as a result of sports that involve sharp direction changes, pivoting and landing. For this reason, athletes are often side-lined from their respective sports for up to 18 months after injury to rehabilitate. As part of the rehabilitation process, knee braces are often prescribed in an attempt to decrease the recovery period of the injured individual by restraining and minimizing the motion at the knee. However, the true efficacy of knee bracing is yet to be fully evaluated as studies show mixed results to whether braces actually decrease the rehabilitation period for patients...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812230/simulation-of-left-ventricular-dynamics-using-a-low-order-mathematical-model
#5
Michael J Moulton, Brian D Hong, Timothy W Secomb
The eventual goal of this study is to develop methods for estimating dynamic stresses in the left ventricle (LV) that could be used on-line in clinical settings, based on routinely available measurements. Toward this goal, a low-order theoretical model is presented, in which LV shape is represented using a small number of parameters, allowing rapid computational simulations of LV dynamics. The LV is represented as a thick-walled prolate spheroid containing helical muscle fibers with nonlinear passive and time-dependent active contractile properties...
August 15, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28810871/effect-of-different-inner-core-diameters-on-structural-strength-of-cannulated-pedicle-screws-under-various-lumbar-spine-movements
#6
Chia-Ming Chang, Yu-Shu Lai, Cheng-Kung Cheng
BACKGROUND: Currently, cannulated pedicle screws have been widely used in minimal invasive or navigation techniques. However, the stress distribution and the strength of different core diameters of cannulated screw are not clear. This study aimed to investigate the mechanical strength of cannulated screws with different inner core diameter under various lumbar spine movements using finite element analysis. RESULTS: The results showed that the von-Mises stress of a cannulated screw was larger than that of a solid screw in all loading conditions, especially above 2 mm in cannulated core diameter...
August 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28810645/influence-of-the-shape-of-the-micro-finite-element-model-on-the-mechanical-properties-calculated-from-micro-finite-element-analysis
#7
Xin-Xin Wen, Hai-Long Yu, Ya-Bo Yan, Chun-Lin Zong, Hai-Jiao Ding, Xiang-Yu Ma, Tian-Sheng Wang, Wei Lei
Assessing the biomechanical properties of trabecular bone is of major biological and clinical significance for the research of bone diseases, fractures and their treatments. Micro-finite element (µFE) models are becoming increasingly popular for investigating the biomechanical properties of trabecular bone. The shapes of µFE models typically include cube and cylinder. Whether there are differences between cubic and cylindrical µFE models has not yet been studied. In the present study, cubic and cylindrical µFE models of human vertebral trabecular bone were constructed...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28807526/the-effect-of-fixed-charge-density-and-cartilage-swelling-on-mechanics-of-knee-joint-cartilage-during-simulated-gait
#8
Lasse P Räsänen, Petri Tanska, Štefan Zbýň, Corrinus C van Donkelaar, Siegfried Trattnig, Miika T Nieminen, Rami K Korhonen
The effect of swelling of articular cartilage, caused by the fixed charge density (FCD) of proteoglycans, has not been demonstrated on knee joint mechanics during simulated walking before. In this study, the influence of the depth-wise variation of FCD was investigated on the internal collagen fibril strains and the mechanical response of the knee joint cartilage during gait using finite element (FE) analysis. The FCD distribution of tibial cartilage was implemented from sodium ((23)Na) MRI into a 3-D FE-model of the knee joint ("Healthy model")...
July 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28807525/experimental-and-computational-analysis-of-micromotions-of-an-uncemented-femoral-knee-implant-using-elastic-and-plastic-bone-material-models
#9
Sanaz Berahmani, Dennis Janssen, Nico Verdonschot
It is essential to calculate micromotions at the bone-implant interface of an uncemented femoral total knee replacement (TKR) using a reliable computational model. In the current study, experimental measurements of micromotions were compared with predicted micromotions by Finite Element Analysis (FEA) using two bone material models: linear elastic and post-yield material behavior, while an actual range of interference fit was simulated. The primary aim was to investigate whether a plasticity model is essential in order to calculate realistic micromotions...
July 29, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28807512/non-linear-finite-element-model-to-assess-the-effect-of-tendon-forces-on-the-foot-ankle-complex
#10
Enrique Morales-Orcajo, Thales R Souza, Javier Bayod, Estevam Barbosa de Las Casas
A three-dimensional foot finite element model with actual geometry and non-linear behavior of tendons is presented. The model is intended for analysis of the lower limb tendon forces effect in the inner foot structure. The geometry of the model was obtained from computational tomographies and magnetic resonance images. Tendon tissue was characterized with the first order Ogden material model based on experimental data from human foot tendons. Kinetic data was employed to set the load conditions. After model validation, a force sensitivity study of the five major foot extrinsic tendons was conducted to evaluate the function of each tendon...
August 11, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28804262/effects-of-boundary-conditions-on-bistable-behaviour-in-axisymmetrical-shallow-shells
#11
P M Sobota, K A Seffen
Multistable shells are thin-walled structures that have more than one stable state of self-stress. We consider isotropic axisymmetrical shallow shells of arbitrary polynomial shapes using a Föppl-von Kármán analytical model. By employing a Rayleigh-Ritz approach, we identify stable shapes from local minima in the strain energy formulation, and we formally characterize the level of influence of the boundary conditions on the critical geometry for achieving bistable inversion-an effect not directly answered in the literature...
July 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28800223/green-fabrication-of-silkworm-cocoon-like-silicon-based-composite-for-high-performance-li-ion-batteries
#12
Fei-Hu Du, Yizhou Ni, Ye Wang, Dong Wang, Qi Ge, Shuo Chen, Hui Ying Yang
Designing yolk-shell nanostructures is an effective way of addressing the huge volume expansion issue for large-capacity anode and cathode materials in Li-ion batteries (LIBs). Previous studies mainly focused on adopting a SiO2 template through HF etching to create yolk-shell nanostructures. However, HF etching is highly corrosive and may result in a significant reduction of Si content in the composite. Herein, a silkworm cocoon-like silicon-based composite is prepared through a green approach in which Al2O3 was selected as a sacrificial template...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28793805/fatigue-failure-of-the-sliding-hip-screw-clinical-and-biomechanical-analysis
#13
Libor Necas, Maros Hrubina, Zoltan Cibula, Jiri Behounek, Stanislav Krivanek, Zdenek Horak
The study was aimed at the clinical and biomechanical analyses of the sliding hip screw breakage with the use of finite element method. We have identified two patients with the sliding screw breakage. In the first patient, the biomechanical analysis revealed the reduced stress values σHMH not exceeding the yield limit or strength limit of the implant. The yield limit was exceeded in second one. Clinical and biomechanical analyses have demonstrated that adherence to technical requirements of the appropriate osteosynthesis implementation is the principal condition of timely healing since it prevents the material failure...
August 9, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28790407/employing-high-frequency-alternating-magnetic-fields-for-the-non-invasive-treatment-of-prosthetic-joint-infections
#14
Rajiv Chopra, Sumbul Shaikh, Yonatan Chatzinoff, Imalka Munaweera, Bingbing Cheng, Seth M Daly, Yin Xi, Chenchen Bing, Dennis Burns, David E Greenberg
Treatment of prosthetic joint infection (PJI) usually requires surgical replacement of the infected joint and weeks of antibiotic therapy, due to the formation of biofilm. We introduce a non-invasive method for thermal destruction of biofilm on metallic implants using high-frequency (>100 kHz) alternating magnetic fields (AMF). In vitro investigations demonstrate a >5-log reduction in bacterial counts after 5 minutes of AMF exposure. Confocal and scanning electron microscopy confirm removal of biofilm matrix components within 1 minute of AMF exposure, and combination studies of antibiotics and AMF demonstrate a 5-log increase in the sensitivity of Pseudomonas aeruginosa to ciprofloxacin...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783652/a-parametric-computational-analysis-into-galvanic-coupling-intrabody-communication
#15
M Amparo Callejon, P Del Campo, Javier Reina-Tosina, Laura M Roa
Intrabody Communication (IBC) uses the human body tissues as transmission media for electrical signals to interconnect personal health devices in wireless body area networks. The main goal of this work is to conduct a computational analysis covering some bioelectric issues that still have not been fully explained, such as the modeling of the skin-electrode impedance, the differences associated to the use of constant voltage or current excitation modes, or the influence on attenuation of the subject's anthropometrical and bioelectric properties...
August 2, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28781982/influence-of-cathode-geometry-on-electron-dynamics-in-an-ultrafast-electron-microscope
#16
Shaozheng Ji, Luca Piazza, Gaolong Cao, Sang Tae Park, Bryan W Reed, Daniel J Masiel, Jonas Weissenrieder
Efforts to understand matter at ever-increasing spatial and temporal resolutions have led to the development of instruments such as the ultrafast transmission electron microscope (UEM) that can capture transient processes with combined nanometer and picosecond resolutions. However, analysis by UEM is often associated with extended acquisition times, mainly due to the limitations of the electron gun. Improvements are hampered by tradeoffs in realizing combinations of the conflicting objectives for source size, emittance, and energy and temporal dispersion...
September 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28781414/test-suite-for-image-based-motion-estimation-of-the-brain-and-tongue
#17
Jordan Ramsey, Jerry L Prince, Arnold D Gomez
Noninvasive analysis of motion has important uses as qualitative markers for organ function and to validate biomechanical computer simulations relative to experimental observations. Tagged MRI is considered the gold standard for noninvasive tissue motion estimation in the heart, and this has inspired multiple studies focusing on other organs, including the brain under mild acceleration and the tongue during speech. As with other motion estimation approaches, using tagged MRI to measure 3D motion includes several preprocessing steps that affect the quality and accuracy of estimation...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28780593/the-mechanical-effects-of-cup-inclination-and-anteversion-angle-on-the-bearing-surface
#18
Nobuhiro Kaku, Tomonori Tabata, Hiroaki Tagomori, Tetsutaro Abe, Hiroshi Tsumura
BACKGROUND: Regarding the cup setting in total hip arthroplasty, range of motion and prevention of dislocation are important. From past reports, the wear of the bearing surface may affect long-term results. This study evaluated the stress applied to the bearing surface by the combined use of the three-dimensional rigid spring model and the finite-element analysis. METHODS: For contact pressure distribution of the bearing surface, interference analysis was performed using a three-dimensional rigid body spring model...
August 5, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28780520/bone-microarchitecture-and-estimated-bone-strength-in-men-with-active-acromegaly
#19
Paula Pb Silva, Fatemeh Ghazanfari Amlashi, Elaine W Yu, Karen J Pulaski-Liebert, Anu Gerweck, Pouneh Fazeli, Elizabeth A Lawson, Lisa B Nachtigall, Beverly M K Biller, Karen K Miller, Anne Klibanski, M Bouxsein, Nicholas A Tritos
CONTEXT: Both acromegaly and adult growth hormone deficiency (GHD) are associated with increased fracture risk. Sufficient data are lacking regarding cortical bone microarchitecture and bone strength, as assessed by micro-finite element analysis (µFEA). OBJECTIVE: To elucidate both cortical and trabecular bone microarchitecture and estimated bone strength in men with active acromegaly or GHD compared to healthy controls. DESIGN AND SUBJECTS: Cross-sectional study at a clinical research center, including 48 men (16 with acromegaly, 16 with GHD and 16 healthy controls)...
August 5, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28774130/modeling-of-thermal-conductivity-of-cvi-densified-composites-at-fiber-and-bundle-level
#20
Kang Guan, Jianqing Wu, Laifei Cheng
The evolution of the thermal conductivities of the unidirectional, 2D woven and 3D braided composites during the CVI (chemical vapor infiltration) process have been numerically studied by the finite element method. The results show that the dual-scale pores play an important role in the thermal conduction of the CVI-densified composites. According to our results, two thermal conductivity models applicable for CVI process have been developed. The sensitivity analysis demonstrates the parameter with the most influence on the CVI-densified composites' thermal conductivity is matrix cracking's density, followed by volume fraction of the bundle and thermal conductance of the matrix cracks, finally by micro-porosity inside the bundles and macro-porosity between the bundles...
December 13, 2016: Materials
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