Does the transversal screw design increase the risk of mechanical complications in dental implants? A finite elements analysis

Auxetic structures are ones, which exhibit an in-plane negative Poisson ratio behavior. Such structures can be obtained by specially designed honeycombs or by specially designed composites. The design of such honeycombs and composites has been tackled using a combination of optimization and finite elements analysis. Since, there is a tradeoff between the Poisson ratio of such structures and their elastic modulus, it might not be possible to attain a desired value for both properties simultaneously. The presented work approaches the problem using evolutionary multiobjective optimization to produce several designs rather than one. The algorithm provides the designs that lie on the tradeoff frontier between both properties.

Download Full-text

Prediction of Cyclic Fatigue Life of Nickel-Titanium Rotary Files by Virtual Modeling and Finite Elements Analysis

Journal of Endodontics ◽

10.1016/j.joen.2015.07.010 ◽

2015 ◽

Vol 41 (11) ◽

pp. 1867-1870 ◽

Cited By ~ 7

Author(s):

Alessandro Scattina ◽

Mario Alovisi ◽

Davide Salvatore Paolino ◽

Damiano Pasqualini ◽

Nicola Scotti ◽

...

Keyword(s):

Fatigue Life ◽

Finite Elements ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Finite Elements Analysis ◽

Virtual Modeling

Download Full-text

Investigation of magnet segmentation techniques for eddy current losses reduction in permanent magnets electrical machines

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-11-2013-0374 ◽

2015 ◽

Vol 34 (1) ◽

pp. 46-60 ◽

Cited By ~ 3

Author(s):

Belli Zoubida ◽

Mohamed Rachid Mekideche

Keyword(s):

Genetic Algorithm ◽

Finite Elements ◽

Eddy Current ◽

Permanent Magnets ◽

Skin Effect ◽

Electrical Machines ◽

Design Parameters ◽

Finite Elements Analysis ◽

Eddy Current Losses ◽

Content Type

Purpose – Reducing eddy current losses in magnets of electrical machines can be obtained by means of several techniques. The magnet segmentation is the most popular one. It imposes the least restrictions on machine performances. This paper investigates the effectiveness of the magnet circumferential segmentation technique to reduce these undesirable losses. The full and partial magnet segmentation are both studied for a frequency range from few Hz to a dozen of kHz. To increase the efficiency of these techniques to reduce losses for any working frequency, an optimization strategy based on coupling of finite elements analysis and genetic algorithm is applied. The purpose of this paper is to define the parameters of the total and partial segmentation that can ensure the best reduction of eddy current losses. Design/methodology/approach – First, a model to analyze eddy current losses is presented. Second, the effectiveness of full and partial magnet circumferential segmentation to reduce eddy loss is studied for a range of frequencies from few Hz to a dozen of kHz. To achieve these purposes a 2-D finite element model is developed under MATLAB environment. In a third step of the work, an optimization process is applied to adjust the segmentation design parameters for best reduction of eddy current losses in case of surface mounted permanent magnets synchronous machine. Findings – In case of the skin effect operating, both full and partial magnet segmentations can lead to eddy current losses increases. Such deviations of magnet segmentation techniques can be avoided by an appropriate choice of their design parameters. Originality/value – Few works are dedicated to investigate partial magnet segmentation for eddy current losses reduction. This paper studied the effectiveness and behaviour of partial segmentation for different frequency ranges. To avoid eventual anomalies related to the skin effect an optimization process based on the association of the finite elements analysis to genetic algorithm method is adopted.

Download Full-text

Design Optimization of Fibres Reinforced Concrete Railway Tracks by Using Non-linear Finite Elements Analysis

10.1007/978-981-16-7160-9_11 ◽

2021 ◽

pp. 117-125

Author(s):

J. L. Tailhan ◽

P. Rossi

Keyword(s):

Reinforced Concrete ◽

Finite Elements ◽

Design Optimization ◽

Finite Elements Analysis ◽

Railway Tracks ◽

Non Linear

Download Full-text

Nonlinear Finite Elements Analysis

IMPACT ENGINEERING: Fundamentals, Experiments and Nonlinear Finite Elements ◽

10.4322/978-85-455210-0-6-09 ◽

2020 ◽

pp. 331-368

Author(s):

Marcilio Alves ◽

Larissa Driemeier

Keyword(s):

Finite Elements ◽

Finite Elements Analysis ◽

Nonlinear Finite Elements

Download Full-text

3D-Shaping of Ceramic Tapes to Manufacture a High-Temperature Miniaturized Furnace

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/cicmt-tha15 ◽

2015 ◽

Vol 2015 (CICMT) ◽

pp. 000282-000286

Author(s):

Jaroslaw Kita ◽

Annica Brandenburg ◽

Irina Sudina ◽

Ralf Moos

Keyword(s):

High Temperature ◽

Temperature Distribution ◽

Finite Elements ◽

Design Process ◽

Gas Sensors ◽

Furnace Chamber ◽

Finite Elements Analysis ◽

Fast Heating ◽

Hexagonal Form ◽

Critical Materials

This contribution shows results of 3D-shaping experiments of ceramic tapes. The structures were made by wrapping structured tapes around a hexagonal alumina rod. After lamination, the rod was removed and the structure was finally fired, similarly as reported in [1]. One out of many possible applications of such structures is a miniaturized furnace for sintering of critical materials, which could contaminate expensive chamber furnaces, for tempering of single gas sensors, or for fast heating at controlled rate. While LTCC technology can be applied only up to 600–700 °C, application of HTCC tapes can extend temperature range to above 1000 °C. Therefore, 99.99% alumina tape (ESL 44007) was used. The here-shown miniaturized furnace has a hexagonal form. For a proper temperature distribution in the furnace chamber, the furnace was equipped with six platinum heaters that can be controlled independently. Finite Elements Analysis (FEM) supported the design process. The paper discusses manufacturing route, beginning with a design process supported by FEM through 3D-shaping by wrapping structured tapes around an alumina rod and finally firing and functionality tests.

Download Full-text