3 edition of **Influence of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell** found in the catalog.

Influence of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell

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Published
**1994** by Virginia Polytechnic Institute and State University, National Aeronautics and Space Administration, National Technical Information Service, distributor in Blacksburg, Va, [Washington, DC, Springfield, Va .

Written in English

- Asymmetry.,
- Cylindrical shells.,
- Fuselages.,
- Internal pressure.,
- Reinforced shells.,
- Reinforcement rings.,
- Stiffening.,
- Structural analysis.

**Edition Notes**

Statement | Naveen Rastogi and Eric R. Johnson. |

Series | [NASA contractor report] -- NASA CR-195953. |

Contributions | Johnson, Eric R., United States. National Aeronautics and Space Administration. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL16125677M |

x1 = l"(Yz/Yl) Y,z orthogonal conical coordinates (see fig. 7) y 1J2 distance from vertex to small and large end of cone, respectively 20 eccentricity of ring centroidal axis measured from inside shell surface, positive for internal ring CY semivertex angle of cone Y shell density per unit area P Poisson's ratio of isotropic shell Pr Poisson's ratio of end ring. Chapter 7: Comparison of Different Shell Theories for Nonlinear Vibrations and Stability of Circular Cylindrical Shells Introduction Most of studies on large-amplitude (geometrically nonlinear) vibrations of circular cylindrical shells used Donnell s nonlinear shallow-shell theory to obtain the equations of motion, as shown in Chapter 5. The Office of Naval Research Department Of The Navy Contract N A Cylindrical bending of laminated cylindrical shells using a modified zig-zag theory laminated shells modeling;layer-wise theories;stress analysis; A relatively simple two-dimensional multilayered shell model is presented for predicting both global quantities and stress distributions across the thickness of multilayered thick shells, that is based on a third-order zig-zag approach.

According to the requirement of vibrational similitude, three models of sti®ened cylindrical shell are designed with the same numbers and position of sti®ener (Marked by M1, M2 and M3). The dimensions of these models are as follow, diameter: mm, mm, mm; length: mm, mm, mm;File Size: 1MB.

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Structural models are examined for the influence of a ring with an asymmetrical cross section on the linear elastic response of an orthogonally stiffened cylindrical shell subjected to internal.

Get this from a library. Influence of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell book of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell.

[Naveen Rastogi; Eric R Johnson; United. scaled orthogonally stiffened cylindrical Influence of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell book, designing equivalent sections for stiffeners and some other approaches, based on similitude theory were taken into consideration.

Finally, a typical stiffened cylindrical shell and its equivalent scale model are fabricated and. The cylindrical-shell member that is orthogonally stiffened by using ring stiffeners of box cross-section and stringers of halved rolled I-section (see Fig.

2), is to be optimized with respect to a cost function, which includes material, manufacturing and painting costs.

Download: Download full-size image; Fig. A part of a fixed offshore Cited by: In this study, the influence of nonuniformity of eccentricity of stringers on the general axial buckling load of stiffened laminated cylindrical shells with simply supported end conditions is investigated.

The critical loads are calculated using Love’s First-order Shear Deformation Theory and solved using the Rayleigh-Ritz procedure. The effects of the shell length-to-radius ratio, shell Cited by: Journal of Sound and Vibration () (1), FREE VIBRATION OF AN ORTHOGONALLY STIFFENED CYLINDRICAL SHELL, PART II: DISCRETE GENERAL STIFFENERS N.

BARDELL AND D. MEAD Department of Aeronautics and Astronautics, University of Southampton, Highfield, Southampton S09 5NH, England (Received 16 Septemberand in revised form 13 February Cited by: A book of the names and address of people living in a city.

'Influence of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell' -- subject(s): Fuselages. The buckling of ring-stiffened cylinders is studied by a 'discrete' approach, in which the rings are considered as linear discontinuities represented by the Dirac delta function.

In this research, the general axial and radial buckling optimization of ring-stiffened cylindrical shells is implemented by the genetic algorithm (GA). The stiffened shell is subjected to four constraints including the fundamental frequency, the structural weight, the axial buckling load, and the radial buckling by: 9.

T.M. Tu and N.V. Loi / Vibration Analysis of Rotating Functionally Graded Cylindrical Shells with Orthogonal Stiffeners Latin American Journal of Solids and Structures 13 () Figure 1: Coordinate system and geometry of rotating stiffened FGM cylindrical by: 4.

Presenting recent principles of thin plate and shell Influence of an asymmetric ring on the modeling of an orthogonally stiffened cylindrical shell book, this book emphasizes novel analytical and numerical methods for solving linear and nonlinear plate and shell dilemmas, new theories for the design and analysis of thin plate-shell structures, and real-world numerical solutions, mechanics, and plate and shell models for engineering appli5/5(4).

The ovaling behavior of a ring‐stiffened thin‐walled cylinder subjected to a static circumferentially varying pressure load is explained, and some useful approximate solutions are obtained.

The important effects due to the presence of ring stiffeners are: (1) The load transferred to the stiffeners by the shell; and (2) the ovaling‐induced. phenomenon has been described in previous papers [1K].

It occurs in the case of a stiffened cylindrical shell with an imperfection in the form of the critical general buckling mode of the perfect shell. The optimum design of an imperfect stiffened cylindrical shell has a general buckling load factor that is usually. LAYERWISE THEORY FOR DISCRETELY STIFFENED LAMINATED CYLINDRICAL SHELLS by Samuel Kinde Kassegne J.N.

Reddy, Chairman Engineering Mechanics (ABSTRACT) The Layerwise Shell Theory is used to model discretely stiffened laminated composite cylindrical shells for stress, vibration, pre-buckling and post-buckling analysis. The. abbreviated survey of the recent literature on the buckling and optimization of stiffened panels and shells.

For brevity most of the references listed there are not repeated here. They apply equally well to the subject of this paper. In [1K] is described the optimization of an externally T-stringer and externally T-ring stiffened cylindrical shell.

Rotating laminated conical shells, Stringer/ring stiffener, Natural Fre- This method is based on a singly curved orthogonally stiffened shell element having a constant M. Talebitooti et al. / Dynamic Analysis and Critical Speed of Rotating Laminated Conical Shells with Orthogonal Stiffeners Effect of ring support position and geometrical dimension on the free vibration of ring-stiffened cylindrical shells is studied in this paper.

The study is carried out by using Sanders shell theory. Based on the Rayleigh-Ritz method, the shell eigenvalue governing equation is derived. The present analysis is validated by comparing results with those in the : Xiao Wan Liu, Bin Liang.

NASA Technical Note D; Influence of Discrete Ring Stiffeners and Prebuckling Deformations on the Buckling of Eccentrically Stiffened Orthotropic Cylinders [David L. Block] on *FREE* shipping on qualifying : David L. Block. Now the influence of the shell geometry on the frequency-amplitude relations of the shell is investigated.

Consider a thin-walled cylindrical shell with h= m, R= m, E=x kN/m2, Q= and US= kg/m 3. For this shell, several geometries with increasing values of Batdorf’s parameter (Z) and same R/h relation are considered.

Table. The influence of geometric irregularities on the linear buckling of cylindrical shells with an elliptic cutout. / Madenci, E.; Barut, A. 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference.

(44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference).Cited by: 2. Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Optimum design of isotropic monocoque and ring-stiffened circular cylindrical shells subject to.

N distribution at midspan (x = 0) of roof shell x with edge beams. 0 0 0 0 0 N distribution at support (x 25 ft) of roof shell xy with edge beams.

0 M distribution at midspan (x = 0) of roof shell y with edge beams. 0 0 Roof shell on diaphragm supports with stiffened rectangular cutout 0 • 0 0 0 0 0 0 0 0 0 0 0. Hull, et al.: RESPONSE OF A CYLINDRICAL SHELL WITH FINITE LENGTH RING STIFFENERS nite length structures with arbitrary boundary conditions with an axial factor term analysis The effects of energy reﬂec-tions off of the stiffener edges were absent in these two papers, although these models captured the majority of the wave prop-Cited by: 1.

Parametric structural FEA (Finite Element Analysis) models of the orthogonal rib-stiffened thin walled cylindrical shells are established using APDL (ANSYS Parametric Design Language). An experiential optimization design method is then developed based on conclusions of series numerical analysis investigating the effects of parameters’ modification upon buckling loads and modes of the : Jia Mao, Yu Feng Chen, Wei Hua Zhang.

For the purposes of obtaining a simple analytical solution, the cylindrical shell is subjected to the fundamental harmonic of the column support and analyzed using membrane theory. It is shown that an ideal location exists for an intermediate ring stiffener such that the axial membrane stress above this ring is circumferentially completely uniform.

(general instability, axisymmetric buckling, and asymmetric collapse of the shell [lobar buckling]) and failure pressures of ring-stiffened cylinders The analytical solution is first summarized based on several sources.

The design rules for the classification societies and the design guidance from two sources are then presented with. Nonlinear postbuckling of eccentrically stiffened functionally graded plates and shallow shells graded material can be evaluated as following E(z) = EmVm + EcVc = Em + (Ec − Em) 2z + h 2h k, ν(z) = ν = const.

The values with subscripts m and c belong to metal and ceramic, respectively. Eccentrically stiffened functionally graded. Full text of "Hydrostatic pressure tests of a ring-stiffened cylinder of oval cross section (major-to-minor axis ratio of )" See other formats IIBS WM^M ''^'eroN HYDROMECHANICS AERODYNAMICS O STRUCTURAL MECHANICS APPLIED MATHEMATICS / >D3 STICS AND 3RATI0N HYDROSTATIC PRESSURE TESTS OF A RING-STIFFENED CYLINDER OF OVAL CROSS SECTION (MAJOR-TO.

Stiffened plates and shells are encountered in many engineering applications. Several analytical and numerical procedures were developed over the past decades for analysis of these structures.

Empirical and simplified analytical models were also developed to Cited by: This banner text can have markup.

web; books; video; audio; software; images; Toggle navigation. THE AXIALLY SYMMETRIC RESPONSE OF AN ELClSTIC CYLINDRICAL SHELL PARTIALLY FImD WITH LIQUID By Richard M. Beam and LeRoy R. Guist Ames Research Center SUMMARY The axially symmetric response of a circular cylindrical shell partially filled with a liquid and subjected to axial displacements and pressurizationFile Size: 1MB.

3 Ring-Stiffened Cylindrical Shell with Conical Ends 98 V SUMMARY AND CONCLUSIONS 5. 1 Discussion of Results and Conclusions 5. 1 Sunnmary of the Work 5. Discussion of Assumed Displacements. 3 Capabilities and Limitations of the Solution Ill 5.

1 Unstiffened Cylindrical Shell with Conical Ends Ill 5. Shell structures form key components in a very wide range of engineering enterprise. The theory of shell structures is an old and large subject, with a huge literature.

However, this book is not a compilation of results from the past. Instead, it is an attempt to bring the essence of the subject within the grasp of engineers. It tackles the fundamental question of how bending and stretching 5/5(1). THE SHELL WITH DOUBLE CURVATURE CONSIDERED AS A PLATE ON AN ELASTIC FOUNDATION o Introduction V.D.C From the differential equation of the doubly curved shell in terms of the displacement components u, v and w it is apparent that, in so far as the to simple mathematical surfaces such as the spherical and the cylindrical Size: 2MB.

An infinitely long cylindrical shell of radius b>a is concentric with the first and has uniform linear charge density of lambda(b). Determine the electric field E in all regions (i.e. for rb, where r is the distance from the center of the concentric shells). Ultimate strength prediction methods which take the inelastic behavior of ring-stiffened cylindrical shells and hemi-spherical shells into account are reviewed.

The modeling uncertainties in terms of bias and coefficient of variation for failure prediction methods in current design guidelines are defined by evaluating the compiled experimental. The cylindrical shell is assumed to be eight-layered plies each having a thickness of mm with different stacking sequences.

The 8 node shell elements have been used in modeling. These elements have the capability ofconsidering large displacement and nonlinear behavior of the structural. The influence of curvature on stress intensity is found to be similar to that of sheet buckling in flat sheets containing cracks.

Keywords: metal sheets, aluminum alloys, fatigue (materials), cracking (fracturing), crack propagation, structural design, curvature, cylindrical shells, loads (forces), stresses, axial strain, static tests, fatigue.

Key-Words: Shell structure, Axially symmetric cylindrical shell walls, Beams on elastic foundation, Superposition method. 1 Introduction. As a structural memberaxially symmetric, cylindrical walls are usually used in cylindrical water tanks.

When a small part of the cylindrical wall is taken and equilibrium equation written is to obtained. shell, the outer surface was machined to the same profile as the inner wall by inserting into the cylinder a ring stiffener located at the dimple to reinforce the shell wall during the machining stage.

Each imperfection shape was constructed using a metal template containing the desired amplitude and wave. BUCKLING OF CIRCULAR CYLINDRICAL SHELLS WITH MULTIPLE ORTHOTROPIC LAYERS AND ECCENTRIC STIFFENERS.

[Robert M. Jones] on *FREE* shipping on qualifying offers.Nondestructive methods, to calculate the download pdf load of imperfection sensitive thin-walled structures, such as large-scale aerospace structures, are one of the most important techniques for the evaluation of new structures and validation of numerical models.

The vibration correlation technique (VCT) allows determining the buckling load for several types of structures without reaching the Cited by: Ideal Location of Intermediate Ring Stiffeners on Discretely Supported Ebook Shells.

Silos in the form of a cylindrical metal shell are commonly elevated to provide access to the space beneath, permitting the contained materials to be directly discharged. A few discrete column supports at evenly spaced intervals are commonly used.