Computational and experimental determination of the parameters of the Cowper — Symonds hardening materials model for metal beams

2021 ◽  
Author(s):  
A.V. Shmelev ◽  
A.V. Amialiusik ◽  
V.I. Ivchenko ◽  
S.V. Hitrikov
Keyword(s):  
Experimental Determination ◽  
Material Model ◽  
Residual Deflection ◽  
Three Point Bending ◽  
Passenger Vehicles ◽  
The Difference ◽  
Scale Experiment ◽  
Experimental Values ◽  
Steel 20

The study introduces a method for the computational and experimental determination of the parameters of the Cowper — Symonds material model for steel beam structures under shock loads, the method being based on the finite element method. A full-scale experiment was carried out on a developed and manufactured installation that implements dynamic shock loading of metal beams according to the three-point bending scheme. The results of the practical approbation of the proposed method are presented on the example of determining the parameters of the Cowper — Symonds model for beams of steel 20. The difference between the calculated and experimental values of the residual deflection of the beam did not exceed 5%. Computer simulation of the experiment was carried out in the ANSYS LS-DYNA software package. The above methodological approaches are proposed to be used in the calculated assessment of the strength of the power structure of passenger vehicles for compliance with the requirements of UN Regulation No. 66.

Strukturbestimmung von Chlorfluorthiocarbonyl durch Elektronenbeugung / The Structure of Thiocarbonyl-chloro-fluoride as determined by Gas-Electron-Diffraction

1975 ◽  
Vol 30 (4) ◽  
pp. 549-553 ◽  
Author(s):  
F. Gleisberg ◽  
A. Haberl ◽  
W. Zeil
Keyword(s):  
Electron Diffraction ◽  
Experimental Determination ◽  
Least Squares ◽  
Qualitative Agreement ◽  
Gas Electron Diffraction ◽  
Mean Square ◽  
Rotational Constants ◽  
Valence Force ◽  
Experimental Values

Abstract Gas electron diffraction (GED) intensities of CSFCl were measured and resulted in an ra- structure of this molecule. An rav-structure was obtained by combining our GED-data and the rotational constants reported by Kohrmann and Zeil. Both structures were found to be consistent within their uncertainties. The planar structure of CSFCl has been confirmed. A least squares analysis resulted in the following rg-distances and bond angles: r(C-Cl) =1.7178±0.0009 Å, r(C=S) =1.5931 ±0.0008 Å, r(C-F) =1.3387±0.0014 Å, ∢ S = (C-Cl)=127.28 ± 0.09°, ∢(S=C-F)= 123.58 ±0.12°.Inclusion of rotational constants into the GED-analysis allowed an experimental determination of all mean square amplitudes (MSA). We have used the valence force constants obtained by Kohrmann to evaluate the MSA theoretically. Qualitative agreement was found between the theoretical and experimental values of the MSA.

scholarly journals Experimental Determination of Lidar Overlap Profile Based on Dual Field-of-View High Spectral Resolution Lidar

2020 ◽  
Vol 237 ◽  
pp. 07014
Author(s):  
Nanchao Wang ◽  
Xue Shen ◽  
Yudi Zhou ◽  
Chong Liu ◽  
Yupeng Zhang ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Spectral Resolution ◽  
Atmospheric Condition ◽  
Field Of View ◽  
High Spectral Resolution ◽  
Backscatter Coefficient ◽  
The Difference ◽  
High Level ◽  
High Spectral Resolution Lidar

This paper presents two approaches to calibrate the overlap factor under inhomogeneous atmospheric condition without critical assumption and delivers detailed analysis about the retrieval errors of overlap profile in High-Spectral-Resolution-Lidar (HSRL). The first method employs an additional optical subsystem with different field-of-view, that is dual field-of-view HSRL, for the retrieval of overlap profile. The second method takes advantage of the difference of the result between the HSRL and Klett method, that is about the retrieval of backscatter coefficient for uncorrected lidar signal, to correct overlap profile. Surprisingly, two methods show very high-level consistency and stability of the result. It is potential that this technique would be an excellent solution for experimental determination of lidar overlap in ground-based HSRL.

To the Experimental Determination of the Spontaneous Polarization for the Silicon Carbide Polytypes

2013 ◽  
Vol 740-742 ◽  
pp. 459-462
Author(s):  
Sergey Yu. Davydov ◽  
Alexander A. Lebedev ◽  
O.V. Posrednik
Keyword(s):  
Silicon Carbide ◽  
Electric Field ◽  
Quantum Wells ◽  
Experimental Determination ◽  
External Electric Field ◽  
Spontaneous Polarization ◽  
Left And Right ◽  
The Difference ◽  
Local Levels

A NH/3C-SiC heterojunction and a heterostructur of the NH/3C/NH type (N = 2, 4, 6, 8) are consid-ered. Two possibilities are analyzed for heterojunctions, in which a Si or a C is the contact plane of the NH polytype. In this case, the energies of the quasi-local levels in the quantum wells at the interface will be different. With the difference of these energies measured, it is possible to determine the spon-taneous polarization inherent in the NH polytype. In the presence of a spontaneous polarization field, the quasi-local levels in the left- and right-hand quantum wells of the heterostructure have dif-ferent energies. It is shown that, if the heterostructur is placed in an external electric field, it is possible to determine the magnitude of the spontaneous polarization by calculating the different between the energies of these levels. Experimental ways to find by using the suggested theoretical scenario are discussed.

scholarly journals Using electromagnetic radiation to power autonomous sensors

2019 ◽  
Vol 30 ◽  
pp. 12015
Author(s):  
Aleksandr Timoshen ◽  
Aleksandr Savochkin
Keyword(s):  
Energy Consumption ◽  
Electromagnetic Radiation ◽  
Experimental Determination ◽  
Power Supply ◽  
Power Sources ◽  
Autonomous Sensors ◽  
Experimental Values

The results of calculation and experimental determination of available power are presented. Power sources of autonomous sensors when exposed to electromagnetic radiation with wavelengths in decimeter and centimeter ranges. The experimental values of the parameters of the field models of antennas and electromagnetic radiation receivers designed to power autonomous sensors. The requirements for energy consumption and power supply of autonomous sensors are formulated.

scholarly journals The effect of temperature on the viscosity of air

1926 ◽  
Vol 113 (763) ◽  
pp. 233-237 ◽  
Keyword(s):  
Present Author ◽  
Effect Of Temperature ◽  
Appreciable Change ◽  
Temperature Range ◽  
Higher Temperature ◽  
The Difference ◽  
Experimental Values ◽  
Coefficient Of Viscosity ◽  
Slight Alteration

In a recent paper Prof. A. 0. Rankine has put forward a number of criticisms of the results obtained from, and the experimental method employed in, the determination of the temperature coefficient of viscosity of air by the present author. In the first place, a comparison is drawn between the author’s results and those of other observers in the lower part of the temperature range, and the conclusion is drawn therefrom that there is a possibility of an error of 3 percent, in the author’s measurements throughout the whole range of temperature used. This inference is reached from the figures quoted in Table II of Rankine’s paper, in which the temperature range from 15° to 183° C. is considered. That some difference exists between the author’s results and those of other observers in the lower part of the temperature range is clear, but it must again be emphasised that the values given for low temperatures are not experimental values, but were obtained by an extension of the graph (fig. 2) for higher temperature measurements to the value of the viscosity as given by Millikanj for room temperatures. A slight alteration of the curvature of this extension would make an appreciable change in the ratios η100/η15 and η183/η15 , but this would not be sufficient to account for the curvature at B in fig. 3 of the original paper. If the values of T ⅜ /η for Breitenbach’s results at 182° C. and 302° C. are plotted on this curve, they lie above the present results and on a curve which would intersect AB at about 600° C. That part of the difference is due to this cause seems to be indicated by the fact that the difference diminishes as the temperature rises. Thus at 300° C. the following values of η300/η15 are obtained by Breitenbach, the only other worker at this temperature, and the author. The figures used are those given by Rankine.

High Pressure Liquid Chromatographic Determination of Saccharin in Alcoholic Products

1977 ◽  
Vol 60 (6) ◽  
pp. 1321-1323
Author(s):  
Milton Tenenbaum ◽  
Glenn E Martin
Keyword(s):  
High Pressure ◽  
Chromatographic Determination ◽  
Extraction Process ◽  
High Pressure Liquid Chromatographic ◽  
Sodium Saccharin ◽  
Liquid Chromatographic Determination ◽  
The Difference ◽  
Experimental Values ◽  
Liquid Chromatographic

Abstract After preliminary cleanup, sodium saccharin can be quantitatively determined in wines and proprietary drugs by using high pressure liquid chromatography. The preliminary cleanup removes materials that cause column deterioration, loss of baseline stability, and interfering peaks. The average experimental error found in analyses of 6 wines for sodium saccharin content was 2.3% and the standard deviation was 0.01. In the analysis of 10 cough medicines and vitamin preparations, the difference between declared and experimental values for sodium saccharin averaged 5.7%. The recovery for the extraction process ranged from 97.8 to 101.6%.

Sign in / Sign up

Export Citation Format

Share Document