Cylindrical shell bending theory for orthotropic shells under general axisymmetric pressure distributions

2012 ◽  
Vol 42 ◽  
pp. 258-265 ◽  
Author(s):  
J. Michael Rotter ◽  
Adam J. Sadowski
Keyword(s):  
Cylindrical Shell ◽  
Pressure Distributions ◽  
Orthotropic Shells

scholarly journals Aeroelastic stability of a cylindrical shell of linearly varying thickness

2019 ◽  
Vol 488 (1) ◽  
pp. 29-35
Author(s):  
V. N. Bakulin ◽  
M. A. Konopelchev ◽  
A. Ya. Nedbay
Keyword(s):  
Cylindrical Shell ◽  
Critical Velocity ◽  
Gas Flow ◽  
Constant Thickness ◽  
Aeroelastic Stability ◽  
Suggested Approach ◽  
Varying Thickness ◽  
Axial Forces ◽  
Supersonic Gas Flow ◽  
Orthotropic Shells

For the first time, the aeroelastic stability equations of a composite cylindrical shell of linearly varying thickness are obtained on the basis of the bending theory of orthotropic shells for a shell subjected to axial forces and supersonic gas flow. The solution of the equations is assumed of the form of a trigonometric series in the axial coordinate. The problem is reduced to an infinite system of algebraic equations by the Bubnov-Galerkin method. The obtained characteristic equation is approximated by the Lagrange polynomial, whose stability is investigated with the use of the Routh-Hurwitz criterion. As a numerical example, the effect of the thickness gradient, structural damping and axial force on the critical velocity for a composite shell of linearly varying thickness in supersonic gas flow is shown. The refinement in the value of the critical velocity resulting from the use of the suggested model is about 35% as compared to the results for a shell of averaged constant thickness. This indicates the relevance of this model for aircraft weight optimization. The suggested approach expands the range of problems to be solved and allows for the analysis of the aeroelastic stability for orthotropic cylindrical shells of linearly varying thickness in supersonic gas flow.

Orthotropic Cylindrical Shells Under Line Load

1979 ◽  
Vol 46 (2) ◽  
pp. 356-362 ◽  
Author(s):  
J. Schwaighofer ◽  
H. F. Microys
Keyword(s):  
Experimental Data ◽  
Cylindrical Shell ◽  
Orthotropic Shell ◽  
Cylindrical Shells ◽  
Orthotropic Cylindrical Shell ◽  
Line Load ◽  
Longitudinal Line ◽  
Theoretical Predictions ◽  
Shell Equations ◽  
Orthotropic Shells

Solutions for an orthotropic cylindrical shell which is subjected to a longitudinal line load along a generator are presented for Flu¨gge and Donnell type orthotropic shell equations. Experimental data of 2 orthotropic shells is presented and compared with the theoretical predictions. The results from the Flu¨gge-type equations agree well with the experimental data for all shells. The solutions based on Donnell-type equations agree well only in case of short shells.

Elasto-plastic state of curve beam system subjected to complex loading

1996 ◽  
Vol 18 (4) ◽  
pp. 14-22
Author(s):  
Vu Khac Bay
Keyword(s):  
Cylindrical Shell ◽  
Solution Method ◽  
Complex Loading ◽  
Numerical Results ◽  
Elastic Solution ◽  
Plastic State ◽  
Curve Beam ◽  
Elastic State ◽  
Elastic Plastic ◽  
Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

Computer Modeling of a Tire under Cornering Loads

1989 ◽  
Vol 17 (2) ◽  
pp. 86-99 ◽  
Author(s):  
I. Gardner ◽  
M. Theves
Keyword(s):  
Finite Element Analysis ◽  
Geometric Approach ◽  
Lateral Force ◽  
Slip Angle ◽  
Element Analysis ◽  
Pressure Distributions ◽  
Slip Effects ◽  
Improved Accuracy ◽  
Nonlinear Geometric ◽  
Good Agreement

Abstract During a cornering maneuver by a vehicle, high forces are exerted on the tire's footprint and in the contact zone between the tire and the rim. To optimize the design of these components, a method is presented whereby the forces at the tire-rim interface and between the tire and roadway may be predicted using finite element analysis. The cornering tire is modeled quasi-statically using a nonlinear geometric approach, with a lateral force and a slip angle applied to the spindle of the wheel to simulate the cornering loads. These values were obtained experimentally from a force and moment machine. This procedure avoids the need for a costly dynamic analysis. Good agreement was obtained with experimental results for self-aligning torque, giving confidence in the results obtained in the tire footprint and at the rim. The model allows prediction of the geometry and of the pressure distributions in the footprint, since friction and slip effects in this area were considered. The model lends itself to further refinement for improved accuracy and additional applications.

Dynamic stability of a free-free cylindrical shell under a follower force

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 1070-1077
Author(s):  
Si-Hyoung Park ◽  
Ji-Hwan Kim
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
Follower Force

Mean velocity and static pressure distributions of a circular jet

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 196-197
Author(s):  
M. T. Islam ◽  
M. A. T. Ali
Keyword(s):  
Static Pressure ◽  
Mean Velocity ◽  
Pressure Distributions
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