scholarly journals SN-EVM unit for experimental studies of stability in circular cylindrical shells under combined loading

2020 ◽  
Vol 786 ◽  
pp. 012011
Author(s):  
S V Cheremnykh ◽  
P O Skudalov
Keyword(s):  
Cylindrical Shells ◽  
Experimental Studies ◽  
Combined Loading ◽  
Circular Cylindrical Shells

Buckling of Circular Cylindrical Shells Using a Displacement Function

1974 ◽  
Vol 96 (4) ◽  
pp. 1322-1327
Author(s):  
Shun Cheng ◽  
C. K. Chang
Keyword(s):  
Boundary Conditions ◽  
Axial Compression ◽  
Cylindrical Shells ◽  
External Pressure ◽  
Displacement Function ◽  
Combined Loading ◽  
Trial Solution ◽  
Governing Differential Equation ◽  
Circular Cylindrical Shells ◽  
The Stability

The buckling problem of circular cylindrical shells under axial compression, external pressure, and torsion is investigated using a displacement function φ. A governing differential equation for the stability of thin cylindrical shells under combined loading of axial compression, external pressure, and torsion is derived. A method for the solutions of this equation is also presented. The advantage in using the present equation over the customary three differential equations for displacements is that only one trial solution is needed in solving the buckling problems as shown in the paper. Four possible combinations of boundary conditions for a simply supported edge are treated. The case of a cylinder under axial compression is carried out in detail. For two types of simple supported boundary conditions, SS1 and SS2, the minimum critical axial buckling stress is found to be 43.5 percent of the well-known classical value Eh/R3(1−ν2) against the 50 percent of the classical value presently known.

Experimental Study on Pre-Stressed Circular Cylindrical Shell

2012 ◽  
Author(s):  
Antonio Zippo ◽  
Marco Barbieri ◽  
Matteo Strozzi ◽  
Vito Errede ◽  
Francesco Pellicano
Keyword(s):  
Experimental Study ◽  
Cylindrical Shell ◽  
Axial Load ◽  
Nonlinear Vibrations ◽  
Circular Cylindrical Shell ◽  
Cylindrical Shells ◽  
Experimental Studies ◽  
Element Model ◽  
Experimental Setup ◽  
Circular Cylindrical Shells

In this paper an experimental study on circular cylindrical shells subjected to axial compressive and periodic loads is presented. Even though many researchers have extensively studied nonlinear vibrations of cylindrical shells, experimental studies are rather limited in number. The experimental setup is explained and deeply described along with the analysis of preliminary results. The linear and the nonlinear dynamic behavior associated with a combined effect of compressive static and a periodic axial load have been investigated for different combinations of loads; moreover, a non stationary response of the structure has been observed close to one of the resonances. The linear shell behavior is also investigated by means of a finite element model, in order to enhance the comprehension of experimental results.

Experimental Studies on the Buckling Under Axial Compression of Integrally Stringer-Stiffened Circular Cylindrical Shells

1977 ◽  
Vol 44 (4) ◽  
pp. 721-730 ◽  
Author(s):  
T. Weller ◽  
J. Singer
Keyword(s):  
Mechanical Properties ◽  
Linear Theory ◽  
Axial Compression ◽  
Cylindrical Shells ◽  
Experimental Studies ◽  
Inelastic Behavior ◽  
Shell Material ◽  
Stiffened Shells ◽  
Circular Cylindrical Shells ◽  
Shell Geometry

An experimental study of the buckling of closely spaced integrally stringer-stiffened circular cylindrical shells under axial compression was carried out to determine the influence of stiffener and shell geometry, as well as mechanical properties of shell material, on the applicability of linear theory. Tests included 84 shells made of two different kinds of steel with completely different mechanical properties and 74 shells made of 7075-T6 Aluminum alloy. Agreement between linear theory and experiments was found to be governed primarily by shell geometry, Z, where for Z > 1000 values of “linearity” (ratio of experimental buckling load to the predicted one) of 70 percent and considerably above were obtained. Correlation with linear theory was also found to be affected by stringer area parameter (A1/bh) where for (A1/bh) > 0.45 the values of linearity obtained exceeded 65 percent and usually were much higher. No significant effect of other stiffener and shell parameters on the applicability of linear theory could be discerned for the specimens tested. The boundary conditions were found to be of importance and for some steel shells the inelastic behavior of the shell material was found to have a considerable effect on the linearity. Predictions of imperfection sensitivity studies could not be correlated with test results. By a conservative structural efficiency criterion all the tested stringer-stiffened shells were found to be more efficient than equivalent weight isotropic shells.

scholarly journals A solution to the problem of stability of thin-walled steel cylindrical shells

Vestnik MGSU ◽  
2021 ◽  
pp. 577-586
Author(s):  
Stepan V. Cheremnykh ◽  
Sergei A. Sokolov
Keyword(s):  
Cylindrical Shell ◽  
Elastic Limit ◽  
Cylindrical Shells ◽  
Experimental Studies ◽  
Stable State ◽  
Stability Loss ◽  
Combined Loading ◽  
Complex Nature ◽  
Shell Stability ◽  
Thin Walled

Introduction. It is necessary to improve methods of analysis of the limit states, occurring when a thin-walled shell is in the elastoplastic domain, to use these cylindrical shells as elements of heavily loaded products of construction and machine building industries. Materials and methods. The problem of stability of a circular thin-walled cylindrical shell, made of steel 45 GOST 1050-2013, that takes the load induced by pure compression and axial torsion, has been studied. Besides, experimental and theoretical components of the problem have been analyzed. Experimental facility SN-EVM was applied to perform an experiment test and analyze its findings in terms of different versions of the theory of plasticity used to solve shell stability problems beyond the elastic limit. The co-authors emphasize the unavailability of any definition of the criterion of stability loss under combined loading based on experimental dependences that were identified earlier. The results of the experiment were compared with the results of the theoretical study. The analysis of the shell stability in the case of complex subcritical loading are based on the A.A. Ilyushin theory of stability, in which plasticity functions are taken according to V.G. Zubchaninov’s approximations. Results. The problem was solved using the software programme, developed by the co-authors. The software solves the bifurcation problem of a cylindrical shell with regard for the complex nature of deformations at the moment of stability loss in the case of exposure to complex subcritical loading, commensurable processes and the trajectory that has the form of circular arcs. It has been shown that the proposed method of analysis and approximations describe the real stress-strain state of shells that feature low flexibility in respect of a complex pattern of deformation and characterize a stable state of the material beyond the elastic limit. Conclusions. The theoretical strength and deformability analysis of a cylindrical shell and its experimental studies demonstrate sufficient convergence which proves their reliability. This conclusion will allow to improve the process of design of structural elements made of materials that have complex mechanical properties.

Experimental Studies of Vibration of Axially Excited Circular Cylindrical Shells Containing Fluid

1969 ◽  
Vol 91 (4) ◽  
pp. 1119-1127 ◽  
Author(s):  
H. Pih ◽  
C. G. Wu
Keyword(s):  
Wave Velocity ◽  
Cylindrical Shells ◽  
Bubble Formation ◽  
Experimental Studies ◽  
Dynamic Responses ◽  
Experimental Result ◽  
One Dimensional ◽  
Pressure Distributions ◽  
Axial Excitation ◽  
Circular Cylindrical Shells

This paper reports a series of experimental studies on the vibration characteristics of circular cylindrical shells containing water under axial excitation. The conditions for the formation of bubble clusters in the fluid during the vibration and the interaction between the shell and the fluid are investigated. The pressure distributions and strains in the tank are correlated. Dynamic responses of the pressure and strains after bubble formation are observed. The wave velocity of the liquid-container system is also determined. It was found that the pressure equation derived, based on one-dimensional strain, could be made to agree with the experimental result when the wave velocity was corrected by an experimentally determined factor. The deformation of the tank was not axisymmetrical in most cases during the vibration. The inertia effect of the tank was not quite negligible. Drastic changes in the pressure and strain were observed after bubble formation.

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