Study of Deformations for Thermoplastic Polyurethane Membrane by Finite Elements Method (FEM)

2016 ◽  
Vol 841 ◽  
pp. 72-76 ◽  
Author(s):  
Mihai Sorin Tripa ◽  
Adrian Botean ◽  
Lucia Ghioltean ◽  
Adriana Sorcoi ◽  
Călin Rareş Roman ◽  
...  
Keyword(s):  
Finite Elements ◽  
Mechanical Characteristics ◽  
Thermoplastic Polyurethane ◽  
Correlation Method ◽  
Fem Analysis ◽  
Finite Elements Method ◽  
Image Correlation ◽  
Wide Range ◽  
Made In ◽  
Polyurethane Membrane

The study about deformations of thermoplastic polyurethane membrane (desmopan membrane) is very important for a lot of industry domains (mechanic, transport, agriculture, chemistry, medicine, ...). This paper presents an original work about deformations by Finite Elements Method (FEM) analysis for desmopan membrane. Thermoplastic polyurethane (desmopan), an anisotropic material, is made in a very wide range of models and types. By Digital Image Correlation Method (DICM) we have determined mechanical characteristics [5].These with geometrical characteristics are required as input for FEM. Stresses [2] and deformations output of FEM, are necessary to calculate the fatigue resistance to limited durability to fracture [7]. After, we can study the membrane reliability of the desmopan membranes for diaphragm pumps.

About the Calculus of Fatigue Resistance to Limited Durability for Thermoplastic Polyurethane Membrane

2015 ◽  
Vol 811 ◽  
pp. 29-34
Author(s):  
Mihaela Suciu ◽  
Mihai Sorin Tripa ◽  
Lucia Ghioltean ◽  
Daniela Paunescu
Keyword(s):  
Finite Elements ◽  
Digital Image Correlation ◽  
Fatigue Resistance ◽  
Original Work ◽  
Mechanical Characteristics ◽  
Thermoplastic Polyurethane ◽  
Correlation Method ◽  
Image Correlation ◽  
Geometrical Characteristics ◽  
Polyurethane Membrane

This paper presents an original work about the calculus of fatigue resistance to limited durability for a desmopan membrane, a thermoplastic polyurethane membrane. For this research we needed the values of stresses, determined by Finite Elements Method (FEM). In order to apply FEM, we needed mechanical characteristics of thermoplastic polyurethane membrane, characteristics that have been determined by Digital Image Correlation Method. Mechanical characteristics and geometrical characteristics, with loadings too, are input for FEM soft. The calculus of fatigue resistance to limited durability serves to reliability studies of the thermoplastic polyurethane membranes, that diaphragm pumps are equipped.

About the Mechanical Characteristics Determination for Desmopan Membrane by Digital Image Correlation Method

2013 ◽  
Vol 332 ◽  
pp. 396-401 ◽  
Author(s):  
Liviu Suciu ◽  
Adrian Botean ◽  
Mihaela Suciu ◽  
Victor Ros
Keyword(s):  
Finite Elements ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Mechanical Characteristics ◽  
Correlation Method ◽  
Image Correlation ◽  
Digital Image Correlation Method ◽  
Geometric Characteristics ◽  
Elasticity Module

This paper presents the determination of longitudinal elasticity module or Young's modulus - E and Poisson's ratio - ν, for a desmopam membrane by Digital Image Correlation Method. These elements, together with the geometric characteristics, are input into the study of membrane by Finite Elements Method (FEM). Values deduced from measurements by Digital Image Correlation Method are convergent with those specified by the manufacturer, [.

Optimal Configuration of Fluid Viscoelastic Seismic Dampers on a Ten Stories Building Using Finite Elements Method

2014 ◽  
Vol 658 ◽  
pp. 241-244 ◽  
Author(s):  
Adriana Ionescu ◽  
Mihai Negru ◽  
Cristian Burada
Keyword(s):  
Finite Elements ◽  
Seismic Energy ◽  
Finite Elements Method ◽  
Vibration Modes ◽  
Building Structure ◽  
Modal Damping ◽  
Linear Damping ◽  
Fluid Dampers ◽  
Optimal Configurations ◽  
Made In

This paper presents a study made in order to find different optimal configurations of positioning fluid dampers on high buildings for dissipating the seismic energy. The study was made using Finite Elements Method and ANSYS program, on a ten stories building structure. The first step of this optimization process is to consider the fluid dampers having linear damping properties in order to achieve a quicker convergence of the solutions. In order to obtain the influence of the dampers configurations on the structure damping there were made multiple different configurations of dampers positioned on different locations on the building. All these models were analyzed using modal analysis and it was obtained the modal damping of the building structure for the first vibration modes of the structures for each configuration. The graphics obtained can be used for achieving different degrees of seismic energy dissipation for the analyzed building.

scholarly journals Modelling a mechanical antenna for a calibrator for interferometric gravitational wave detector using finite elements method

2021 ◽  
Vol 2090 (1) ◽  
pp. 012157
Author(s):  
A R C Prado ◽  
F S Bortoli ◽  
N. S. Magalhaes ◽  
R N Duarte ◽  
C Frajuca ◽  
...  
Keyword(s):  
Finite Elements ◽  
Gravitational Wave ◽  
Finite Elements Method ◽  
Gravitational Wave Detector ◽  
Active Systems ◽  
Suspension Systems ◽  
Wave Detector ◽  
Active Suspension Systems ◽  
Gravitational Wave Detectors ◽  
Made In

Abstract Interferometric gravitational wave detectors (IGWD) are a very complex detector, the need to lock the detector in a dark fringe condition besides the vibrations that affect the mirrors, creates the necessity of using active suspension systems. These active systems make the system reach the desired sensitivity but make the calibration of such detectors much more difficult. To solve this problem a calibrator is proposed, a resonant mass gravitational wave detector could be used to detect the same signal in a narrower band and use the measured amplitude to calibrate the IGWD, as resonant mass gravitational wave detectors are easily calibrated. This work aims to design the mechanical antenna of such a calibrator. The main difficulty is to design the calibrator is the frequencies required to make the detection. These massive detectors usually were made in frequencies close to 1 kHz and the frequency range to operate for better sensitivity is around 100 Hz. The antenna is modelled in finite elements method and a design of such an antenna is presented.

LTCC Enzymatic Microreactor

2007 ◽  
Vol 4 (2) ◽  
pp. 51-56 ◽  
Author(s):  
Karol Malecha ◽  
Dorota Pijanowska ◽  
Leszek Golonka ◽  
Wladyslaw Torbicz
Keyword(s):  
Finite Elements ◽  
Low Temperature ◽  
Immobilized Enzyme ◽  
Three Dimensional ◽  
Finite Elements Method ◽  
Fluid Movement ◽  
Chemically Modified ◽  
Polymeric Beads ◽  
Immobilization Techniques ◽  
Made In

A novel three dimensional LTCC (Low Temperature Co-fired Ceramics) based microreactor with immobilized enzyme (urease) is presented in this paper. The microreactor consists of two chambers separated by a threshold. The shape of the chambers was optimized by the Finite Elements Method. The modeling has brought a better understanding of the microflow of chemically modified glass or polymeric beads through the microreactor. The modeling results are verified by the observation of the fluid movement inside the real structure via a top transparent polymer layer. Moreover, immobilization techniques of enzymes on polymeric beads are investigated. Finally, the properties of the LTCC microreactor are compared with the properties of a similar one made in silicon.

scholarly journals Preliminary Experimental and Numerical Study of Metal Element with Notches Reinforced by Composite Materials

2021 ◽  
Vol 5 (5) ◽  
pp. 134
Author(s):  
Paweł J. Romanowicz ◽  
Bogdan Szybiński ◽  
Mateusz Wygoda
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Numerical Study ◽  
Correlation Method ◽  
Industrial Applications ◽  
Experimental Results ◽  
Image Correlation ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Wide Range

The presented study is related to the application of the composite overlays used in order to decrease the effect of the stress concentrations around the cut-outs in structural metal elements. The proposed approach with the application of the digital image correlation extends the recently presented studies. Such structural elements with openings of various shapes have been accommodated for a wide range of industrial applications. These structures exhibit certain stress concentrations which decrease their durability and strength. To restore their strength, various reinforcing overlays can be used. In the present paper, the flat panel structure without and with the composite overlays made of HEXCEL TVR 380 M12/26%/R-glass/epoxy is under the experimental and the numerical study. Particular attention is paid to the investigation of the samples with the rectangular holes, which for smooth rounded corners offer a higher durability than the samples with the circular hole of the same size. The experimental results are obtained for the bare element and are reinforced with composite overlay samples. The experimental results are obtained with the use of the Digital Image Correlation method, while the numerical results are the product of the Finite Element Analysis. In the numerical analysis, the study of the shape, size and fiber orientation in applied overlays is done. The reduction of the stress concentration observed in opening notches has confirmed the effectiveness of the overlay application. In the investigated example, the application of the square composite overlay increased the structure strength even by 25%.

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