Experimental Study on Critical Load of Compression Column with a Rectangular Cross-Section Based on Material Mechanics

2014 ◽  
Vol 908 ◽  
pp. 287-290
Author(s):  
Shi Chuang Zhuo ◽  
Qiang Zhang ◽  
Shun Cai Li
Keyword(s):  
Experimental Study ◽  
Critical Load ◽  
Cross Section ◽  
Strain Measurement ◽  
Measurement Method ◽  
Test Bench ◽  
Rectangular Cross Section ◽  
Resistance Strain ◽  
Euler Formula ◽  
Horizontal Asymptote

By means of resistance strain gauge and multifunctional test bench of materials mechanics, the relation curve between the axial compressive forces of the two-ends hinged column with a rectangular cross-section and total bridge strain was obtained by the resistance strain measurement method, accordingly, by the horizontal asymptote of this relation curve the critical load of compression column was obtained. The study indicates that the critical load obtained respectively by the resistance strain measurement method and Euler formula theory fits very well, and the research results verified the reliability of the experimental method.

Experimental study of breaking wave loads on elevated pile cap with rectangular cross-section

2021 ◽  
Vol 227 ◽  
pp. 108878
Author(s):  
Jie Hong ◽  
Kai Wei ◽  
Zhonghui Shen ◽  
Bo Xu ◽  
Shunquan Qin
Keyword(s):  
Experimental Study ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Breaking Wave ◽  
Wave Loads ◽  
Pile Cap

scholarly journals Формирование и деформация капель жидкости в микроканалах

2020 ◽  
Vol 46 (15) ◽  
pp. 18
Author(s):  
Ф.В. Роньшин ◽  
Ю.А. Дементьев ◽  
Е.А. Чиннов
Keyword(s):  
Experimental Study ◽  
Flow Regime ◽  
Cross Section ◽  
Weber Number ◽  
Rectangular Cross Section ◽  
Critical Value ◽  
Drop Formation ◽  
Liquid Bridges ◽  
Liquid Moving ◽  
Side Walls

An experimental study of drop formation in narrow horizontal microchannels with rectangular cross section and a height from 50 to 150 micrometers was performed. It is shown that in these channels there is a new flow regime when drops moving along the microchannel, which are vertical liquid bridges. Three mechanisms of the formation of such drops are distinguished: the formation directly near the liquid nozzle, the separation of droplets from the liquid moving along the side walls of the channel, and due to the destruction of strongly deformed drops and horizontal liquid bridges. It was found that the deformation of drops increases with an increase in the Weber number. It is shown that when the first critical value of the Weber number is reached, the drops begin to deform, and when the second Weber number is reached, they break.

The lateral instability of yielded mild steel beams of rectangular cross-section

1950 ◽  
Vol 242 (846) ◽  
pp. 197-242 ◽  
Keyword(s):  
Mild Steel ◽  
Critical Load ◽  
Cross Section ◽  
Applied Load ◽  
Principal Axis ◽  
Rectangular Cross Section ◽  
Torsional Rigidity ◽  
Steel Beams ◽  
Lateral Instability ◽  
Lateral Buckling

The critical load causing secondary failure of a deep beam by lateral buckling may be calculated by standard methods for those cases in which the beam behaves elastically under the applied load. When, however, the load is sufficiently great to cause partial yield of the beam, these methods give an estimate for the critical load which is too high. In the present paper the phenomenon of lateral buckling in deep mild steel beams of rectangular cross-section is studied from both a theoretical and an experimental standpoint. The paper is divided into three parts. In part I the critical lateral buckling load is shown to depend on the flexural rigidity of the beam about its weaker principal axis while the applied load, causing flexure about its stronger principal axis, is held constant. The dependence of this rigidity on the extent to which the beam has yielded is calculated, and the results are confirmed by tests on beams of rectangular and circular cross-section. It is also shown that the critical load depends on the initial torsional rigidity of the beam, defined as the initial slope of the torque against angle of twist per unit length relation for torsion about the longitudinal axis of the beam while the applied bending load is held constant. In part II it is first shown that in a beam which has partially yielded the shear force due to the variation of the applied bending moment along the length of the beam is carried entirely in the central elastic core of the beam. Using the theory of combined elastic and plastic deformation, it is then shown that the initial torsional rigidity remains constant at its value for elastic torsion, and experimental evidence in favour of this conclusion is presented. Using the results of parts I and II, the conditions causing lateral instability in deep mild steel beams of rectangular cross-section are determined in part III. For a beam bent by pure terminal couples these conditions may be deduced directly, but for the cases of beams subjected to central concentrated loads and of cantilevers a step by step solution of the governing differential equation is necessary. Experimental confirmation is given for the case of pure bending.

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