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Finite element analysis

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https://www.readbyqxmd.com/read/29243185/effect-of-fiber-post-length-and-abutment-height-on-fracture-resistance-of-endodontically-treated-premolars-prepared-for-zirconia-crowns
#1
Jie Lin, Jukka Pekka Matinlinna, Akikazu Shinya, Michael George Botelho, Zhiqiang Zheng
The purpose of this study was to compare the fracture resistance, mode of fracture, and stress distribution of endodontically treated teeth prepared with three different fiber post lengths and two different abutment heights, using both experimental and finite element (FE) approaches. Forty-eight human maxillary premolars with two roots were selected and endodontically treated. The teeth were randomly distributed into six equally sized groups (n = 8) with different combinations of post lengths (7.5, 11, and 15 mm) and abutment heights (3 and 5 mm)...
December 14, 2017: Odontology
https://www.readbyqxmd.com/read/29241057/fe-analysis-of-surface-acoustic-wave-transmission-in-composite-piezoelectric-wedge-structures
#2
A N Darinskii, M Weihnacht, H Schmidt
The paper numerically investigates the transmission of harmonic surface acoustic waves (SAWs) across the perfectly bonded and perfectly sliding contacts between two 90°-wedges, at least one of which possessing piezoelectric properties. The finite element method in frequency domain is used. The structures are constructed of lithium niobate, fused quartz, silicon and gallium arsenide. The SAW is always incident from lithium niobate. The dependences of the transmission coefficient on the combination of materials and the orientation of the lithium niobate, as well as on the height of the step at the interface between the two parts of the structure are computed and analyzed...
November 27, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29235192/influence-of-implant-position-in-implant-assisted-removable-partial-denture-a-three-dimensional-finite-element-analysis
#3
Octavi Ortiz-Puigpelat, Aida Lázaro-Abdulkarim, Javier-María de Medrano-Reñé, Jordi Gargallo-Albiol, Josep Cabratosa-Termes, Federico Hernández-Alfaro
PURPOSE: To determine the ideal position of a dental implant to assist a posterior extended partial removable dental prosthesis (PRDP), through stress values, displacement values, and deformation of periodontal ligament (PDL). MATERIALS AND METHODS: A finite element analysis of different implant positions was analyzed using a 3D mandible model from a human patient. Test models were created: model A (implant in second molar area), model B (implant in the first molar area), and model C (implant in premolar area)...
December 13, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29234924/a-new-direction-in-anastomotic-research-should-we-redesign-the-angle-of-sorrow
#4
Omar E Aly
INTRODUCTION: Despite advances in oncological outcomes in colo-rectal surgery, rates of anastomotic leak have not improved. The precise mechanisms of anastomotic leak remain poorly understood. Current research has focused on anastomotic reinforcement to tackle anastomotic leak with little success. The 'Angle of Sorrow', the corner of the anastomosis is prone to anastomotic leak, but remains a persistent feature in the gastrointestinal anastomosis. The tendency for stress forces to concentrate in the vulnerable 'Angle of Sorrow' prompts the need for anastomotic design research...
December 12, 2017: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/29234681/corrigendum-to-biomechanical-evaluation-of-a-tooth-restored-with-high-performance-polymer-pekk-post-core-system-a-3d-finite-element-analysis
#5
Ki-Sun Lee, Joo-Hee Shin, Jong-Eun Kim, Jee-Hwan Kim, Won-Chang Lee, Sang-Wan Shin, Jeong-Yol Lee
[This corrects the article DOI: 10.1155/2017/1373127.].
2017: BioMed Research International
https://www.readbyqxmd.com/read/29234021/workflow-assessing-the-effect-of-gait-alterations-on-stresses-in-the-medial-tibial-cartilage-combined-musculoskeletal-modelling-and-finite-element-analysis
#6
K S Halonen, C M Dzialo, M Mannisi, M S Venäläinen, M de Zee, M S Andersen
Knee osteoarthritis (KOA) is most common in the medial tibial compartment. We present a novel method to study the effect of gait modifications and lateral wedge insoles (LWIs) on the stresses in the medial tibial cartilage by combining musculoskeletal (MS) modelling with finite element (FE) analysis. Subject's gait was recorded in a gait laboratory, walking normally, with 5° and 10° LWIs, toes inward ('Toe in'), and toes outward ('Toe out wide'). A full lower extremity MRI and a detailed knee MRI were taken...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29233699/comparative-finite-element-analysis-of-skull-mechanical-properties-following-parietal-bone-graft-harvesting-in-adults
#7
Pierre Haen, Guillaume Dubois, Patrick Goudot, Thomas Schouman
INTRODUCTION: Parietal bone grafts are commonly used in cranio-maxillo-facial surgery. Both the outer and the internal layer of the calvarium can be harvested. The bone defect created by this harvesting may induce significant weakening of the skull that has not been extensively evaluated. Our aim was to evaluate the consequences of parietal bone graft harvesting on mechanical properties of the skull using a finite element analysis. METHODS: Finite elements models of the skull of 3 adult patients were created from CT scans...
November 26, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29231176/tensorcalculator-exploring-the-evolution-of-mechanical-stress-in-the-ccmv-capsid
#8
Olga Kononova, Farkhad Maksudov, Kenneth A Marx, Valeri Barsegov
A new computational methodology for accurate numerical calculation of the Cauchy stress tensor, stress invariants, principal stress components, von Mises and Tresca tensors is developed. The methodology is based on the atomic stress approach which permits the calculation of stress tensors, widely used in continuum mechanics modeling of materials properties, using the output from the MD simulations of discrete atomic and Cα-based coarse-grained structural models of biological particles. The methodology mapped into software package TensorCalculator was successfully applied to the empty Cowpea Chlorotic Mottle virus (CCMV) shell to explore the evolution of mechanical stress in this mechanically-tested specific example of a soft virus capsid...
December 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29230094/application-of-finite-element-phase-field-and-calphad-based-methods-to-additive-manufacturing-of-ni-based-superalloys
#9
Trevor Keller, Greta Lindwall, Supriyo Ghosh, Li Ma, Brandon M Lane, Fan Zhang, Ursula R Kattner, Eric A Lass, Jarred C Heigel, Yaakov Idell, Maureen E Williams, Andrew J Allen, Jonathan E Guyer, Lyle E Levine
Numerical simulations are used in this work to investigate aspects of microstructure and microseg-regation during rapid solidification of a Ni-based superalloy in a laser powder bed fusion additive manufacturing process. Thermal modeling by finite element analysis simulates the laser melt pool, with surface temperatures in agreement with in situ thermographic measurements on Inconel 625. Geometric and thermal features of the simulated melt pools are extracted and used in subsequent mesoscale simulations. Solidification in the melt pool is simulated on two length scales...
October 15, 2017: Acta Materialia
https://www.readbyqxmd.com/read/29230042/direct-current-triboelectricity-generation-by-a-sliding-schottky-nanocontact-on-mos2-multilayers
#10
Jun Liu, Ankur Goswami, Keren Jiang, Faheem Khan, Seokbeom Kim, Ryan McGee, Zhi Li, Zhiyu Hu, Jungchul Lee, Thomas Thundat
The direct conversion of mechanical energy into electricity by nanomaterial-based devices offers potential for green energy harvesting 1-3 . A conventional triboelectric nanogenerator converts frictional energy into electricity by producing alternating current (a.c.) triboelectricity. However, this approach is limited by low current density and the need for rectification 2 . Here, we show that continuous direct-current (d.c.) with a maximum density of 106 A m-2 can be directly generated by a sliding Schottky nanocontact without the application of an external voltage...
December 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29225424/parametric-analysis-of-electromechanical-and-fatigue-performance-of-total-knee-replacement-bearing-with-embedded-piezoelectric-transducers
#11
Mohsen Safaei, R Michael Meneghini, Steven R Anton
Total knee arthroplasty (TKA) is a common procedure in the United States; it has been estimated that about 4 million people are currently living with primary knee replacement in this country. Despite huge improvements in material properties, implant design, and surgical techniques, some implants fail a few years after surgery. A lack of information about in vivo kinetics of the knee prevents the establishment of a correlated intra- and postoperative loading pattern in knee implants. In this study, a conceptual design of an ultra high molecular weight (UHMW) knee bearing with embedded piezoelectric transducers is proposed, which is able to measure the reaction forces from knee motion as well as harvest energy to power embedded electronics...
September 2017: Smart Materials & Structures
https://www.readbyqxmd.com/read/29224416/utilising-three-dimensional-printing-techniques-when-providing-unique-assistive-devices-a-case-report
#12
Sarah Jane Day, Shaun Patrick Riley
BACKGROUND: The evolution of three-dimensional printing into prosthetics has opened conversations about the availability and cost of prostheses. This report will discuss how a prosthetic team incorporated additive manufacture techniques into the treatment of a patient with a partial hand amputation to create and test a unique assistive device which he could use to hold his French horn. Case description and methods: Using a process of shape capture, photogrammetry, computer-aided design and finite element analysis, a suitable assistive device was designed and tested...
December 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29222717/correction-to-peak-stresses-shift-from-femoral-tunnel-aperture-to-tibial-tunnel-aperture-in-lateral-tibial-tunnel-acl-reconstructions-a-3d-graft-bending-angle-measurement-and-finite-element-analysis
#13
Hans Van Der Bracht, Thomas Tampere, Pieter Beekman, Alexander Schepens, Wouter Devriendt, Michiel Cromheecke, Peter Verdonk, Jan Victor
Unfortunately, one of the co-author's name was missed in the original online publication of this article. The name should be included as sixth author in the author group.
December 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29221980/coaptation-surface-area-and-aortic-regurgitation-the-infinite-potential-of-finite-element-analysis
#14
EDITORIAL
Swapnil Khoche
No abstract text is available yet for this article.
October 12, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29221903/discrete-element-analysis-is-a-valid-method-for-computing-joint-contact-stress-in-the-hip-before-and-after-acetabular-fracture
#15
Kevin C Townsend, Holly D Thomas-Aitken, M James Rudert, Andrew M Kern, Michael C Willey, Donald D Anderson, Jessica E Goetz
Evaluation of abnormalities in joint contact stress that develop after inaccurate reduction of an acetabular fracture may provide a potential means for predicting the risk of developing post-traumatic osteoarthritis. Discrete element analysis (DEA) is a computational technique for calculating intra-articular contact stress distributions in a fraction of the time required to obtain the same information using the more commonly employed finite element analysis technique. The goal of this work was to validate the accuracy of DEA-computed contact stress against physical measurements of contact stress made in cadaveric hips using Tekscan sensors...
November 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29221058/determination-of-dissipative-dyakonov-surface-waves-using-a-finite-element-method-based-eigenvalue-algorithm
#16
Pi-Kuei Shih, Hui-Hsin Hsiao, Hung-Chun Chang
A full-vectorial finite element method is developed to analyze the surface waves propagating at the interface between two media which could be dissipative particularly. The dissipative wave possessing a complex-valued propagation constant can be determined precisely for any given propagation direction and thus the property of losses could be thoroughly analyzed. Besides, by applying a special characteristic of the implicit circular block matrix, we reduce the computational consumptions in the analysis. By utilizing this method, the Dyakonov surface wave (DSW) at the interface between a dielectric and a metal-dielectric multilayered (MDM) structure which serves as a hyperbolic medium is discussed...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29219849/multidirectional-flexible-force-sensors-based-on-confined-self-adjusting-carbon-nanotube-arrays
#17
Jae-Ik Lee, Soonjae Pyo, Min-Ook Kim, Jongbaeg Kim
We demonstrate a highly sensitive force sensor based on self-adjusting carbon nanotube (CNT) arrays. Aligned CNT arrays are directly synthesized on silicon microstructures by a space-confined growth technique which enables a facile self-adjusting contact. To afford flexibility and softness, the patterned microstructures with the integrated CNTs are embedded in polydimethylsiloxane structures. The sensing mechanism is based on variations in the contact resistance between the facing CNT arrays under the applied force...
December 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29217091/microstructural-changes-associated-with-osteoporosis-negatively-affect-loading-induced-fluid-flow-around-osteocytes-in-cortical-bone
#18
Vittorio Gatti, Evan M Azoulay, Susannah P Fritton
Loading-induced interstitial fluid flow in the microporosities of bone is critical for osteocyte mechanotransduction and for the maintenance of tissue health, enhancing convective transport in the lacunar-canalicular system. In recent studies, our group has reported alterations of bone's vascular porosity and lacunar-canalicular system microarchitecture in a rat model of postmenopausal osteoporosis. In this work, poroelastic finite element analysis was used to investigate whether these microstructural changes can affect interstitial fluid flow around osteocytes...
November 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29216199/the-potential-of-statistical-shape-modelling-for-geometric-morphometric-analysis-of-human-teeth-in-archaeological-research
#19
Christopher Woods, Christianne Fernee, Martin Browne, Sonia Zakrzewski, Alexander Dickinson
This paper introduces statistical shape modelling (SSM) for use in osteoarchaeology research. SSM is a full field, multi-material analytical technique, and is presented as a supplementary geometric morphometric (GM) tool. Lower mandibular canines from two archaeological populations and one modern population were sampled, digitised using micro-CT, aligned, registered to a baseline and statistically modelled using principal component analysis (PCA). Sample material properties were incorporated as a binary enamel/dentin parameter...
2017: PloS One
https://www.readbyqxmd.com/read/29215571/application-of-the-superelastic-niti-spring-in-ankle-foot-orthosis-afo-to-create-normal-ankle-joint-behavior
#20
Amirhesam Amerinatanzi, Hashem Zamanian, Narges Shayesteh Moghaddam, Ahmadreza Jahadakbar, Mohammad Elahinia
Hinge-based Ankle Foot Orthosis (HAFO) is one of the most common non-surgical solutions for the foot drop. In conventional HAFOs, the ankle joint is almost locked, and plantar flexion is restricted due to the high stiffness of the hinge mechanism. This often leads to a rigid walking gate cycle, poor muscle activity, and muscle atrophy. Since the ankle torque-angle loop has a non-linear profile, the use of a superelastic NiTi spring within the hinge, due to its nonlinear behavior, could recreate a close-to-normal stiffness of the normal ankle joint, which, in turn, could create a more natural walk...
December 7, 2017: Bioengineering
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