scholarly journals Torsion of a thin-walled structure of a waveguide with rectangular cross-section

2021 ◽  
Vol 1155 (1) ◽  
pp. 012017
Author(s):  
I V Kudryavtsev ◽  
M V Brungardt ◽  
E A Goncharova ◽  
O A Li ◽  
S I Troshin
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Thin Walled

Thin-Walled Beams: the Case of the Rectangular Cross-Section

2004 ◽  
Vol 76 (1) ◽  
pp. 45-66 ◽  
Author(s):  
Lorenzo Freddi ◽  
Antonino Morassi ◽  
Roberto Paroni
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Thin Walled

Experimental and Numerical Study of the Energy Absorbed with Various Thickness of Thin Rectangular and Square Sections

2012 ◽  
Vol 229-231 ◽  
pp. 1120-1124
Author(s):  
Sajjad Dehghanpour ◽  
Sobhan Dehghanpour
Keyword(s):  
Numerical Analysis ◽  
Energy Absorption ◽  
Cross Section ◽  
Numerical Study ◽  
Rectangular Cross Section ◽  
Lateral Loading ◽  
Thin Walled

Impact is one of very important subjects which always have been considered in mechanical science. Nature of impact is such that which makes its control a hard task. Therefore it is required to present the transfer of impact to other vulnerable part of a structure, when it is necessary, one of the best method of absorbing energy of impact , is by using Thin-walled tubes these tubes collapses under impact and with absorption of energy, it prevents the damage to other parts. Purpose of recent study is to survey the deformation and energy absorption of tubes with different type of cross section (rectangular or square) and with similar volumes, height, mean cross section, and material under loading. Lateral loading of tubes are quasi-static type and beside as numerical analysis, also experimental experiences has been performed to evaluate the accuracy of the results. Results from the surveys is indicates that in a same conditions which mentioned above, samples with square cross section ,absorb more energy compare to rectangular cross section, and also by increscent in thickness, energy absorption would be more.

Flexural Vibrations of a Thin-Walled Cylinder of Rectangular Cross Section

1958 ◽  
Vol 9 (4) ◽  
pp. 331-345
Author(s):  
E. H. Mansfield
Keyword(s):  
Cross Section ◽  
Stress Function ◽  
Flexural Rigidity ◽  
Rectangular Cross Section ◽  
Shear Lag ◽  
Transverse Vibrations ◽  
Thin Walled ◽  
Flexural Vibrations ◽  
Walled Cylinder ◽  
Natural Transverse

SummaryThe natural transverse vibrations of a long cylindrical box of doubly symmetrical rectangular cross section are considered. Explicit stress-function solutions are obtained for the webs and the top and bottom surfaces so that the effects of shear lag and shear deflection are inherently included. The results are expressed simply in terms of an effective flexural rigidity, which may be determined with the aid of a number of graphs.

scholarly journals Improvement of prt-9 constructive system on the basis of frame elements strength balance

2020 ◽  
Vol 100 (4) ◽  
pp. 40-45
Author(s):  
Taras Dovbush ◽  
Nadia Khomyk ◽  
Hanna Tson ◽  
Anatoliy Dovbush
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Organic Fertilizer ◽  
Experimental Investigations ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Strength Uniformity ◽  
Shaped Cross Section ◽  
Main Frame

Analytical and experimental investigations of the most loaded elements of the base frame of PRT-9 solid organic fertilizer spreader are carried out in this paper. The residual operation life of the central beam of the paired Z-shaped profile, as well as the lateral spars of the Z-shaped cross section are determined. According to the results of studies, it was found that the residual operation life of these system elements differ significantly. In order to achieve strength uniformity of the main frame elements, it is decided to weaken the central beam by replacing the paired Z-shaped profile with a thin-walled tube of rectangular cross-section and strengthen the lateral spars by replacing Z-shaped profile with a channel profile with the same height.

NONLINEAR THIN-WALLED BEAMS WITH A RECTANGULAR CROSS-SECTION — PART I

2012 ◽  
Vol 22 (03) ◽  
pp. 1150016 ◽  
Author(s):  
LORENZO FREDDI ◽  
MARIA GIOVANNA MORA ◽  
ROBERTO PARONI
Keyword(s):  
Cross Section ◽  
Elastic Energy ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Scaling Factor ◽  
One Dimensional ◽  
Thin Walled ◽  
The Cross ◽  
Limit Models ◽  
Cross Section Part

Our aim is to rigorously derive a hierarchy of one-dimensional models for thin-walled beams with rectangular cross-section, starting from three-dimensional nonlinear elasticity. The different limit models are distinguished by the different scaling of the elastic energy and of the ratio between the sides of the cross-section. In this paper we report the first part of our results. More precisely, denoting by h and δh the length of the sides of the cross-section, with δh ≪ h, and by [Formula: see text] the scaling factor of the bulk elastic energy, we analyze the cases in which δh/εh → 0 (subcritical) and δh/εh → 1 (critical).

scholarly journals Almost sure stability of the thin-walled beam subjected to end moments

2003 ◽  
pp. 193-208 ◽  
Author(s):  
Ratko Pavlovic ◽  
Predrag Kozic
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Damping Coefficient ◽  
Physical Parameters ◽  
Almost Sure Stability ◽  
Liapunov Method ◽  
Process Variance ◽  
Thin Walled ◽  
The Stability ◽  
Asymptotic Stability Condition

The dynamic stability problem of the thin-walled beams subjected to end moments is studied. Each moment consists of constant part and time-dependent stochastic non-white function. Closed form analytical solutions are obtained for simply supported boundary conditions. By using the direct Liapunov method almost sure asymptotic stability condition is obtained as function of stochastic process variance, damping coefficient, geometric and physical parameters of the beam. The stability regions for I-cross section and narrow rectangular cross section are shown in variance - damping coefficient plane when stochastic part of moment is Gaussian zero-mean process with variance ?2 and harmonic process with amplitude A.

Analysis of the Collapse Behaviour Regarding TWB Crash-Boxes in Conjunction with the Construction Technique

2014 ◽  
Vol 657 ◽  
pp. 634-638
Author(s):  
Vlad Andrei Ciubotariu
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Weld Line ◽  
Maximum Level ◽  
The Other ◽  
Construction Technique ◽  
Tailor Welded Blanks ◽  
Thin Walled Structures ◽  
The Mean ◽  
Thin Walled

The crash-boxes are thin-walled structural components with rectangular cross-section which are utilized in the construction of the resistance body structures in the auto industry. This components can be manufactured from various materials including homogenous steel sheet metals, tailor welded blanks (TWB) or even composite materials. The benefits of using TWB were shown in numerous studies before and they are not the main purpose here.This research focuses on the collapse behaviour of TWB thin-walled structures with rectangular cross-section subject of impact loadings. The main objective is to design a crash-box which allows the absorption and dissipation of great kinetic energy constituting better resistance structures for car bodies.After analysing the resulted data, a few aspects regarding the TWB crash-boxes were revealed and some conclusions could be suggested: the weld line generates a barrier like zone which delays in some manner the propagation of the progressive buckling levelling the mean crash load; no flange crash-boxes presented best results regarding the mean crash load even if the data were very close to the other crash-box types. Furthermore, the peak crash load was at maximum level comparing with the other crash-box types. This collapsing behaviour of the no flange crash-boxes could be assigned to the fact that the bonded sides of the structure work like double walls into the same cress-section and is not really affecting the asymmetric crash mode of the structure.

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