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https://www.readbyqxmd.com/read/29346112/numerical-model-reduction-for-the-prediction-of-interface-pressure-applied-by-compression-bandages-on-the-lower-leg
#1
Fanette Chassagne, Jerome Molimard, Reynald Convert, Pascal Giraux, Pierre Badel
OBJECTIVE: To develop a new method for the prediction of interface pressure applied by medical compression bandages. METHODS: A finite element simulation of bandage application was designed, based on patient-specific leg geometries. For personalized interface pressure prediction, a model reduction approach was proposed, which included the parametrization of the leg geometry. Pressure values computed with this reduced model were then confronted to experimental pressure values...
February 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29343194/a-brain-impact-stress-analysis-using-advanced-discretization-meshless-techniques
#2
Marco Marques, Jorge Belinha, Lúcia Maria Js Dinis, Renato Natal Jorge
This work has the objective to compare the mechanical behaviour of a brain impact using an alternative numerical meshless technique. Thus, a discrete geometrical model of a brain was constructed using medical images. This technique allows to achieve a discretization with realistic geometry, allowing to define locally the mechanical properties according to the medical images colour scale. After defining the discrete geometrical model of the brain, the essential and natural boundary conditions were imposed to reproduce a sudden impact force...
January 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29342321/contributions-of-material-properties-and-structure-to-increased-bone-fragility-for-a-given-bone-mass-in-the-ucd-t2dm-rat-model-of-type-2-diabetes
#3
Claire Acevedo, Meghan Sylvia, Eric Schaible, James L Graham, Kimber L Stanhope, Lionel N Metz, Bernd Gludovatz, Ann V Schwartz, Robert O Ritchie, Tamara N Alliston, Peter J Havel, Aaron J Fields
Adults with type 2 diabetes (T2D) have a higher fracture risk for a given bone quantity, but the mechanisms remain unclear. Using a rat model of polygenic obese T2D, we demonstrate that diabetes significantly reduces whole-bone strength for a given bone mass (micro-CT-derived BMC), and we quantify the roles of T2D-induced deficits in material properties versus bone structure, i.e., geometry and microarchitecture. Lumbar vertebrae and ulnae were harvested from 6-month-old lean Sprague-Dawley rats, obese Sprague-Dawley rats, and diabetic obese UCD-T2DM rats (diabetic for 69 ± 7 days; blood glucose >200 mg/dl)...
January 17, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29342080/comparisons-of-different-models-on-dynamic-recrystallization-of-plate-during-asymmetrical-shear-rolling
#4
Tao Zhang, Lei Li, Shi-Hong Lu, Hai Gong, Yun-Xin Wu
Asymmetrical shear rolling with velocity asymmetry and geometry asymmetry is beneficial to enlarge deformation and refine grain size at the center of the thick plate compared to conventional symmetrical rolling. Dynamic recrystallization (DRX) plays a vital role in grain refinement during hot deformation. Finite element models (FEM) coupled with microstructure evolution models and cellular automata models (CA) are established to study the microstructure evolution of plate during asymmetrical shear rolling. The results show that a larger DRX fraction and a smaller average grain size can be obtained at the lower layer of the plate...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29341975/validation-of-a-simplified-implant-retained-cantilever-fixed-prosthesis
#5
João Paulo Mendes Tribst, Vinícius Anéas Rodrigues, Alexandre Luiz Souto Borges, Dimas Rennó de Lima, Renato Sussumu Nishioka
PURPOSE: To evaluate the stress and strain generated in a fixed four-element prosthesis under the application of axial and nonaxial loads using a simplified implant-supported fixed prosthesis model. MATERIALS AND METHODS: A 3-dimensional model was constructed containing 3 implants with a conventional anatomical prosthesis (G1). The second model with the same implant system received the simplified prosthesis (G2). A load of 300 N was applied at an axial point and a nonaxial point through finite element analysis software...
January 16, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29340344/biomechanical-comparison-of-different-implant-inclinations-and-cantilever-lengths-in-all-on-4-treatment-concept-by-three-dimensional-finite-element-analysis
#6
Oguz Ozan, Sevcan Kurtulmus-Yilmaz
PURPOSE: The aim of this study was to evaluate the effect of implant inclination and cantilever length on the stress distribution in mandibular cortical bone, implant, abutment, prosthetic framework, and prosthetic screw via three-dimensional (3D) finite element analysis (FEA). MATERIALS AND METHODS: Four different finite element models (0-0, 17-17, 30-30, 45-30) were designed according to the tilting angle (0, 17, 30, and 45 degrees) of the posterior implant and angle of multiunit abutments (0, 17, and 30 degrees)...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29339002/development-of-a-new-three-directional-distractor-system-for-the-correction-of-maxillary-transverse-and-sagittal-deficiency
#7
Canay Yılmaz Asan, Nükhet Kütük, Gökmen Kurt, Alper Alkan
PURPOSE: Class 3 malocclusions with maxillary deficiency, which are treated surgically and/or ordonotically, are common among adult patients. The aim of this study was to develop a three-directional bone-borne distractor that would allow the transverse expansion and sagittal advancement of the maxilla simultaneously. MATERIALS AND METHODS: Computed tomography images of a patient with maxillary deficiency were transmitted to a software program, and a distractor was designed with different sizes (D1, D2, D3) and manufactured from titanium alloy...
December 18, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29338748/finite-element-analysis-of-intramedullary-nailing-and-double-locking-plate-for-treating-extra-articular-proximal-tibial-fractures
#8
Fancheng Chen, Xiaowei Huang, Yingsun Ya, Fenfen Ma, Zhi Qian, Jifei Shi, Shuolei Guo, Baoqing Yu
BACKGROUND: Proximal tibia fractures are one of the most familiar fractures. Surgical approaches are usually needed for anatomical reduction. However, no single treatment method has been widely established as the standard care. Our present study aims to compare the stress and stability of intramedullary nails (IMN) fixation and double locking plate (DLP) fixation in the treatment of extra-articular proximal tibial fractures. METHODS: A three-dimensional (3D) finite element model of the extra-articular proximal tibial fracture, whose 2-cm bone gap began 7 cm from the tibial plateau articular surface, was created fixed by different fixation implants...
January 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29338171/flexible-capacitive-piezoelectric-sensor-with-vertically-aligned-ultra-long-gan-wires
#9
Amine El Kacimi, Emmanuelle Pauliac-Vaujour, Joel Eymery
We report a simple and scalable fabrication process of flexible capacitive piezoelectric sensors using vertically aligned gallium nitride (GaN) wires as well as their physical principles of operation. As-grown N-polar GaN wires obtained by self-catalyst metal-organic vapor phase epitaxy are embedded into a PDMS matrix and directly peeled off from the sapphire substrate before metallic electrode contacting. This geometry provides an efficient control of the wire orientation and an additive contribution of the individual piezoelectric signals...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29337891/modeling-of-dynamic-behavior-of-carbon-fiber-reinforced-polymer-cfrp-composite-under-x-ray-radiation
#10
Kun Zhang, Wenhui Tang, Kunkun Fu
Carbon fiber-reinforced polymer (CFRP) composites have been increasingly used in spacecraft applications. Spacecraft may encounter highenergy-density X-ray radiation in outer space that can cause severe damage. To protect spacecraft from such unexpected damage, it is essential to predict the dynamic behavior of CFRP composites under X-ray radiation. In this study, we developed an in-house three-dimensional explicit finite element (FEM) code to investigate the dynamic responses of CFRP composite under X-ray radiation for the first time, by incorporating a modified PUFF equation-of-state...
January 16, 2018: Materials
https://www.readbyqxmd.com/read/29337394/3d-printing-of-materials-with-tunable-failure-via-bioinspired-mechanical-gradients
#11
Dimitri Kokkinis, Florian Bouville, André R Studart
Mechanical gradients are useful to reduce strain mismatches in heterogeneous materials and thus prevent premature failure of devices in a wide range of applications. While complex graded designs are a hallmark of biological materials, gradients in manmade materials are often limited to 1D profiles due to the lack of adequate fabrication tools. Here, a multimaterial 3D-printing platform is developed to fabricate elastomer gradients spanning three orders of magnitude in elastic modulus and used to investigate the role of various bioinspired gradient designs on the local and global mechanical behavior of synthetic materials...
January 16, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29337367/correlation-of-simulation-finite-element-analysis-to-the-separation-of-intrinsically-magnetic-spores-and-red-blood-cells-using-a-microfluidic-magnetic-deposition-system
#12
Jianxin Sun, L Moore, Wei Xue, James Kim, Maciej Zborowski, Jeffrey J Chalmers
Magnetic separation of cells has been, and continues to be, widely used in a variety of applications, ranging from healthcare diagnostics to detection of food contamination. Typical, these technologies require cells labeled with antibody magnetic particle conjugate and a high magnetic energy gradient created in the flow containing the labeled cells (i.e. a column packed with magnetically inducible material), or dense packing of magnetic particles next to the flow cell. Such designs while creating high magnetic energy gradients, are not amenable to easy, highly detailed, mathematic characterization...
January 16, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29336820/micro-ct-and-micro-fe-analysis-of-pedicle-screw-fixation-under-different-loading-conditions
#13
Y Chevalier, M Matsuura, S Krüger, C Fleege, M Rickert, M Rauschmann, C Schilling
Anchorage of pedicle screw instrumentation in the elderly spine with poor bone quality remains challenging. In this study, micro finite element (µFE) models were used to assess the specific influence of screw design and the relative contribution of local bone density to fixation mechanics. These were created from micro computer tomography (µCT) scans of vertebras implanted with two types of pedicle screws, including a full region-or-interest of 10 mm radius around each screw, as well as submodels for the pedicle and inner trabecular bone of the vertebral body...
December 26, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29336354/an-analytical-poroelastic-model-for-ultrasound-elastography-imaging-of-tumors
#14
Md Tauhidul Islam, Anuj Chaudhry, Ginu Unnikrishnan, J N Reddy, Raffaella Righetti
The mechanical behavior of biological tissues has been studied using a number of mechanical models. Due to the relatively high fluid content and mobility, many biological tissues have been modeled as poroelastic materials. Diseases such as cancers are known to alter the poroelastic response of a tissue. Tissue poroelastic properties such as compressibility, interstitial permeability and fluid pressure also play a key role for the assessment of cancer treatments and for improved therapies. At the present time, however, a limited number of poroelastic models for soft tissues are retrievable in the literature, and the ones available are not directly applicable to tumors as they typically refer to uniform tissues...
January 16, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29335485/electron-beam-melting-in-the-fabrication-of-three-dimensional-mesh-titanium-mandibular-prosthesis-scaffold
#15
Rongzeng Yan, Danmei Luo, Haitao Huang, Runxin Li, Niu Yu, Changkui Liu, Min Hu, Qiguo Rong
The study was designed to fulfill effective work-flow to fabricate three-dimensional mesh titanium scaffold for mandibular reconstruction. The 3D titanium mesh scaffold was designed based on a volunteer with whole mandible defect. (1) acquisition of the CT data; (2) design with computer aided design (CAD) and finite element analysis (FEA). The pore size and intervals with the best mechanic strength was also calculated using FEA. (3) fabrication of the scaffold using electron beam melting (EBM); (4) implantation surgery...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335193/damage-mechanisms-in-bioactive-glass-matrix-composites-under-uniaxial-compression
#16
Qifeng Jiang, Jewan Ismail, Fahmi Zaïri, Zhengwei Qu, Xiaobing Liu, Fahed Zaïri
The damage and crack resistance improvement of bioactive glass is of prime importance, particularly when applied to the repair of load-bearing bones. The present contribution is focused on the prediction of damage mechanisms and crack resistance under uniaxial compression of bioactive glass matrix composites reinforced with a particulate phase. In order to characterize the effects of voids and particles on the damage mechanisms and the macro-response, a two-step homogenization is performed by considering the two phases existing at two different scales: micro/meso through the homogenization of the porous matrix and then meso/macro through the periodic micro-field approach...
December 24, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29334767/a-novel-adaptive-algorithm-for-3d-finite-element-analysis-to-model-extracortical-bone-growth
#17
Vee San Cheong, Gordon W Blunn, Melanie J Coathup, Paul Fromme
Extracortical bone growth with osseointegration of bone onto the shaft of massive bone tumour implants is an important clinical outcome for long-term implant survival. A new computational algorithm combining geometrical shape changes and bone adaptation in 3D Finite Element simulations has been developed, using a soft tissue envelope mesh, a novel concept of osteoconnectivity, and bone remodelling theory. The effects of varying the initial tissue density, spatial influence function and time step were investigated...
January 16, 2018: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29334509/comparison-of-stress-and-strain-distribution-around-splinted-and-nonsplinted-6-mm-short-implants-in-posterior-mandible-a-finite-element-analysis-study
#18
Mansour Meimandi, Mohammad Reza Talebi Ardakani, Reza Amid, Amir Mahmoudi Motlagh, Shahrzad Beheshti
PURPOSE: This study was designed to compare the biomechanical performance of splinted and nonsplinted short implants, in the posterior mandible, using finite element analysis. MATERIALS AND METHODS: Three-dimensional models of short implants with 2 different diameters (4 × 6 mm or 5 × 6 mm) were scanned, and CATIA (R21) was used to simulate the model of an edentulous lower jaw. Experimental groups were designed as follows: (1) D4L6-splinted (three 4 × 6-mm splinted implants), (2) D4L6-nonsplinted, (3) D5L6-splinted, and (4) D5L6-nonsplinted...
January 12, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29334482/carbon-nanotubes-within-polymer-matrix-can-synergistically-enhance-mechanical-energy-dissipation
#19
Taimoor Ashraf Ashraf, Meelad Ranaiefar, Sumit Khatri, Jamshid Kavosi, Frank Gardea, Bryan Glaz, Mohammad Naraghi
Safe operation and health of structures relies on their ability to effectively dissipate undesired vibrations, which could otherwise significantly reduce the life-time of a structure due to fatigue loads or large deformations. To address this issue, nanoscale fillers, such as carbon nanotubes (CNTs), have been utilized to dissipate mechanical energy in polymer-based nanocomposites through filler-matrix interfacial friction by benefitting from their large interface area with the matrix. In this manuscript, for the first time, we experimentally investigate the effect of CNT alignment with respect to reach other and their orientation with respect to the loading direction on vibrational damping in nanocomposites...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29332997/epr-uniform-field-signal-enhancement-by-dielectric-tubes-in-cavities
#20
James S Hyde, Richard R Mett
The dielectric tube resonator (DTR) for EPR spectroscopy is introduced. It is defined as a metallic cylindrical TE011 microwave cavity that contains a dielectric tube centered on the axis of the cylinder. Contour plots of dimensions of the metallic cylinder to achieve resonance at 9.5 GHz are shown for quartz, sapphire, and rutile tubes as a function of wall thickness and average radius. These contour plots were developed using analytical equations and confirmed by finite element modeling. They can be used in two ways: design of the metallic cylinder for use at 9...
December 2017: Applied Magnetic Resonance
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