scholarly journals Numerical and Experimental Study on the Locally Blast Loaded Polyurea Coated Steel Plates

2019 ◽  
Vol 56 (3) ◽  
pp. 492-499
Author(s):  
Florina Bucur ◽  
Eugen Trana ◽  
Adrian Rotariu
Keyword(s):  
Experimental Tests ◽  
Cost Effective ◽  
Experimental Results ◽  
Steel Plates ◽  
Coated Steel ◽  
Quick Response ◽  
Blast Mitigation ◽  
Private Research ◽  
Set Up ◽  
Research Facilities

The damages and casualties inflicted by mine and IED attacks in security challenging areas generated a strong and quick response from nations all over the world. As a part of this response several national and private research facilities increased their efforts in identifying and implementing new ways or technologies to enable blast wave mitigation. The current paper aim to investigate the opportunity of using polyurea coated steel plates as a possible new blast mitigation approach, as suggested by several investigators. In order to objectively conclude about the ability of polyurea coated plates to sustain locally blast loads several experimental tests were performed according to STANAG 4569 demands for a 1/6 scaled plate structure. In order to numerically validate the experimental results several Autodyn simulations were set-up. The numerical and experimental results exibits a fair correlation, both pointing towards a dismiss of the idea of using polyurea coated steel plates as structural and cost effective blast mitigation approach.

scholarly journals EXPERIMENTAL STUDIES OF UNPROTECTED AND PROTECTED STEEL STRUCTURES UNDER FIRE

2016 ◽  
Author(s):  
Véronique Saulnier ◽  
Sébastien Durif ◽  
Abdelhamid Bouchaïr ◽  
Philippe Audebert ◽  
Mohamed Lahmar
Keyword(s):  
Fire Protection ◽  
Steel Plate ◽  
Experimental Studies ◽  
Steel Structures ◽  
Experimental Tests ◽  
Steel Plates ◽  
Experimental Protocol ◽  
Plate Temperature ◽  
Angle Section ◽  
Set Up

<p>Preliminary fire experimental tests have been carried out on steel plates protected with intumescent coating.</p><p>The tests evaluated and measured the heating of steel plates with various geometrical configurations: shape, size. A first test on an equal leg angle section showed interesting results with different coating expansion on the faces of the section.</p>The second test campaign is done with different protections to compare behaviors of four steel plates. The first objective is to set up an experimental protocol for future tests. Those results are used to evaluate analytical prevision of steel plate temperature with and without fire protection.

One Dimensional Modeling of Catalyst for Internal Combustion Engine Simulation

2006 ◽  
Author(s):  
David Chalet ◽  
Jose´ Galindo ◽  
He´ctor Climent
Keyword(s):  
Shock Wave ◽  
Steady Flow ◽  
Experimental Test ◽  
Test Bench ◽  
Experimental Tests ◽  
Experimental Results ◽  
One Dimensional ◽  
Set Up ◽  
Experimental Test Bench ◽  
Good Agreement

The aim of this paper consists of establishing a methodology for oxidation catalyst modeling based on experimental tests and the development of a theoretical model with zero and one dimensional elements. Related to the theoretical work, the main aspects of such modeling are presented. It consists of describing the inner catalyst geometry by a combination of volumes and simple pipes network. The gas properties in volumes are calculated with a filling and emptying approach whereas the unsteady flow in pipes elements is considered to be one-dimensional and solved by using a finite difference scheme. Concerning the experimental tests, a study is carried out on a shock tube bench. The advantage of this experimental test bench is to study the propagation of a shock wave in the catalyst under controlled and convenient conditions, i.e. cold and non steady flow. Later, the model is set up by comparing the upstream and downstream pressure signals with the simulation results. Since the model lacks of relevant information of pressure losses at the inlet and outlet of the channels, which are rather difficult to compute due to the complex phenomena and flow maldistributions if the use of a 3D CFD code is avoided, the calibration of the model to match the experimental data is the decided approach. In this context, the shock wave test bench is used in order to excite the catalyst with non-steady flow conditions rather than to reproduce the conditions that will appear in real engine operation. The comparison shows good agreement between one-dimensional and experimental results. In order to validate this new modeling on a real engine configuration, an experimental validation is carried out in a four-stroke turbocharged Diesel engine. This experimental test bench allows to measure the main engine characteristics and performance as well as the instantaneous pressure upstream and downstream the catalyst. A simulation code has been also set up to model the engine and the comparison in terms of exhaust pressure pulses propagation inside the catalyst shows good agreement between the one-dimensional model and the experimental results.

Effects of Cathodic Protection and Coating on the Corrosion Rate of Carbon Steel in Stagnant and Flowing Freshwater

2013 ◽  
Vol 686 ◽  
pp. 219-226
Author(s):  
Abdelsalam Ahdash ◽  
Esah Hamzah ◽  
Ali Ourdjini ◽  
Siti Rahmah Shamsuri
Keyword(s):  
Carbon Steel ◽  
Steel Plate ◽  
Experimental Tests ◽  
The Other ◽  
Steel Plates ◽  
Coated Steel ◽  
Corrosion Rates ◽  
Bare Steel ◽  
Protection Layer ◽  
Impressed Current

The protection of carbon steel in freshwater media has been examined via two techniques (Impressed current cathodic and coating). This paper shows the reduction of corrosion rates under different conditions. Experimental tests were carried out for two types of steel (bared, coated) and with ICCP/without ICCP in stagnant and flowing freshwater. The results showed there was a variation in the values of potential according to the formation of the protection layer on the surface of steel plates. Furthermore, this layer showed such an excellent protection for both steels with ICCP in stagnant and flowing freshwater, where the values of potential had decreased from -840mV to -875 mV. However, the values of potential had increased from -702 mV to -630 mV for the coated steel without ICCP. On the other hand, the values of potential slightly fluctuated up to -10 mV for the bare steel without ICCP. The reason behind this increase is attributed to the formation of an oxide layer on the surface of the steel plate.

Experimental Tests on Buckling of Torispherical Heads and Methods of Plastic Bifurcation Analysis

1986 ◽  
Vol 108 (2) ◽  
pp. 138-145 ◽  
Author(s):  
R. L. Roche ◽  
B. Autrusson
Keyword(s):  
Bifurcation Analysis ◽  
Experimental Tests ◽  
General Purpose ◽  
Experimental Results ◽  
Steel Plates ◽  
Practical Result ◽  
General Purpose Computer ◽  
Elastic Shear ◽  
Good Agreement ◽  
Incremental Theory Of Plasticity

Sixteen torispherical heads were tested under internal pressure. These heads, which were 500 mm in diameter, had diameter/thickness ratios ranging from 330 to 1000. They were all prepared by spinning mild steel plates. Deflections along the axis and in the knuckle area were recorded. The most practical result is the buckling pressure and this can be exceeded without fracturing the head. The tests show that the buckling pressure is relatively unaffected by geometric imperfections. These experimental results are used to assess the validity of the different plastic bifurcation analysis methods. Five different methods were employed using the CASTEM general-purpose computer program. The method based on the incremental theory of plasticity proved to be incapable of correctly predicting head buckling. If this method is modified by replacing the elastic shear modulus by the secant modulus, the results obtained show good agreement with experimental results.

Failure Conditions from Push-Out Tests of a Steel-Concrete Joint: Experimental Results

2011 ◽  
Vol 488-489 ◽  
pp. 714-717 ◽  
Author(s):  
Peter Helincks ◽  
Wouter de Corte ◽  
Jan Klusák ◽  
Stanislav Seitl ◽  
Veerle Boel ◽  
...  
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Experimental Tests ◽  
Experimental Results ◽  
Steel Plates ◽  
Element Analysis ◽  
Concrete Core ◽  
Concrete Joints ◽  
Failure Conditions ◽  
Push Out

Steel-concrete joints can suffer from premature fail due to inadequate shear bond between the two surfaces. In this paper the shear bond strength between steel and self-compacting concrete (SCC) without mechanical shear connectors is evaluated through push-out tests. The test samples consist of two sandblasted steel plates (10 and 6 mm) and a concrete core, with connection between steel and concrete obtained by a 2-component epoxy resin, gritted with granulates. During the tests, the ultimate shear force is recorded as well as the slip between steel and concrete. All test members exhibited a concrete - adhesive failure, and indicate nominal shear bond stresses between 2.20 and 4.22 MPa. In addition, a substantial difference in measured shear bond stresses is found between the 6 and 10 mm steel plates, indicating unwanted secondary effects with the 6 mm plates. During testing, maximum slip values between 0.02 and 0.05 mm are recorded. In addition to the experimental tests, shear stress distribution in the epoxy – concrete interface is examined by finite element analysis (FEA). In this way, a non-uniform stress distribution between steel and concrete is found with the maximum shear value about 2.5 times higher than the nominal shear stress value. The FEA combined with the experimental results provide a reasonable understanding of the shear induced failure conditions at a steel-concrete joint, and create test data for a fracture mechanics approach.

scholarly journals Performance Analysis of Electromechanical Tuner for Broadband Application

2020 ◽  
Vol 9 (9) ◽  
pp. 11-13
Keyword(s):  
Performance Analysis ◽  
Communication Systems ◽  
Impedance Matching ◽  
Cost Effective ◽  
Experimental Results ◽  
Rf Power ◽  
Power Devices ◽  
Passive Components ◽  
Sensor Application ◽  
Set Up

The greatest challenges to RF power devices are to match impedance for coupled network. Many causes for improper impedance results in cable loss, reflection losses and hence reduce the performance of existing system. An Impedance tuner is designed for testing prior to final set up to get satisfactory output with saving time. In modern communication systems many technologies are adding relay coils and other compensating passive components. In this paper, an impedance matching tuner is designed for multiband application with compact and cost effective structure. The characteristics of fabricated tuner is designed for 50 ohm matching two port network .The designed Electro mechanical tuner is manually characterised on the basis of experimental results to validate the system. The results suggest that it works for multiband sub GHz, Bluetooth sensor application.

Design of Microalloyed Steel for Wind Turbine Towers and Influence of Chemical Composition on Microstructure and Mechanical Properties

2017 ◽  
Vol 1143 ◽  
pp. 32-37
Author(s):  
Liviu Gurau ◽  
Carmela Gurau ◽  
Gheorghe Gurau
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Wind Turbine ◽  
Microalloyed Steel ◽  
Experimental Tests ◽  
Steel Plates ◽  
Wind Turbine Tower ◽  
Wind Turbine Towers ◽  
Thick Steel ◽  
Set Up

The contribution of this paper is to provide the effect of chemical composition on both cost and mechanical properties for steel used to wind turbine tower. Each chemical element has been chosen to contribute to the desired final properties. After establishing the chemical composition has been set up metallurgical route. To determine the influence of chemical composition and thermomechanical treatments a series of experimental tests were conducted to evaluate the structure and mechanical properties. A detail analysis involving macroscopic feature and microstructure analysis of the microalloyed steel was also performed by optical microscopy (OM).The mechanical properties were evaluated by tensile test and Charpy V-Notch test. The experimental tests and analysis results show that there are significant improved in the material properties of thick steel plates when comparing it with the Standard, EN10025/3-2004.

Experimental Analysis on Chemical Dehumidification of Air by Liquid Desiccant and Desiccant Regeneration in a Packed Tower

2004 ◽  
Vol 126 (1) ◽  
pp. 587-591 ◽  
Author(s):  
Giovanni A. Longo ◽  
Andrea Gasparella
Keyword(s):  
Air Conditioning ◽  
Experimental Tests ◽  
Experimental Results ◽  
Liquid Desiccant ◽  
Humidity Ratio ◽  
Simulation Code ◽  
Packed Tower ◽  
One Dimensional ◽  
Dimensional Simulation ◽  
Set Up

This paper presents the experimental tests on the chemical dehumidification of air by a liquid desiccant and desiccant regeneration carried out in an absorption/desorption tower with random packing. The experimental set-up is fully described together with measurements, procedures, data reduction, and accuracy. The experimental tests include 46 dehumidification runs and 38 desiccant regeneration runs carried out with the traditional hygroscopic solution H2O/LiBr and the new solution H2O/KCOOH in the typical operative ranges of air conditioning applications. The experimental results are reported in terms of humidity reduction, desiccant concentration change, and tower efficiency. The experimental tests show that chemical dehumidification of air by liquid desiccants ensures consistent reduction in humidity ratio, which is suitable for the application to air conditioning or drying processes. The experimental results are also compared to a one-dimensional simulation code of a packed tower: a fair agreement was found between experimental and calculated performance.

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