Skin Stringer Debonding Evolution in Stiffened Composite Panels under Compressive Load: A Novel Numerical Approach

2013 ◽  
Vol 577-578 ◽  
pp. 605-608 ◽  
Author(s):  
Aniello Riccio ◽  
A. Raimondo ◽  
F. Scaramuzzino
Keyword(s):  
Experimental Data ◽  
Numerical Study ◽  
Compressive Load ◽  
Numerical Approach ◽  
Composite Panels ◽  
Time Step ◽  
Stiffened Composite Panels ◽  
Area Growth ◽  
Numerical Tool ◽  
Applied Displacement

In this paper, a numerical study, on the compressive behaviour of stiffened composite panels with skin-stringer debonding has been carried out. The analysis has been performed by adopting a novel robust (mesh and time step independent) finite elements based numerical model on a single stiffener panel with an artificial debonding. In order to prove the effectiveness of the proposed numerical tool, the results in terms of debonded area growth and compressive load versus applied displacement, have been compared with experimental data available in literature.

An Experimental and Numerical Study on Bead Stiffened Composite Panels

2018 ◽  
pp. 627-634
Author(s):  
H. Hosseini-Toudeshky ◽  
J. Loughlan ◽  
M. Kharazi ◽  
M. Sadeghi
Keyword(s):  
Numerical Study ◽  
Composite Panels ◽  
Stiffened Composite Panels

Vibrations of Stiffened Composite Panels With Smart Materials

2004 ◽  
Vol 126 (3) ◽  
pp. 370-379 ◽  
Author(s):  
Kevin C. Poulin ◽  
Rimas Vaicaitis
Keyword(s):  
Feedback Control ◽  
Smart Materials ◽  
Numerical Study ◽  
Composite Panels ◽  
Stiffened Composite Panels ◽  
Parametric Studies ◽  
Er Fluids ◽  
Stiffness And Damping ◽  
Direct Feedback ◽  
Er Fluid

A numerical study of the use of electrorheological (ER) fluids and piezoelectric (PZT) actuators to control random vibrations of stiffened composite panels is presented. Active control of stiffness and damping is provided by the ER fluids and direct feedback control is provided by the PZT’s. New forms of transfer matrices are developed to include the effects of these smart materials. The modal equations of an equivalent uniform panel are converted into state-space form and digital stochastic feedback control is implemented. PZT direct feedback control is compared with digital stochastic feedback control. Parametric studies quantify the effect of actuator size and number, and ER fluid action.

Experimental and Numerical Study of the Response of an Axial Compressor to Distorted Inlet Flow

1988 ◽  
Vol 110 (4) ◽  
pp. 355-360 ◽  
Author(s):  
G. Billet ◽  
J. Huard ◽  
P. Chevalier ◽  
P. Laval
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Study ◽  
Axial Compressor ◽  
Numerical Approach ◽  
Compressor Blade ◽  
Numerical Results ◽  
Test Stand ◽  
Viscous Effects ◽  
Inlet Flow

A model representing the response of fixed or rotating axial compressor blade-rows is coupled to a 3-D numerical simulation of the flow outside the blade rows. The code can be used to study nonuniform compressible 3-D flows through turbomachines. The fluid is assumed to be inviscid in the space outside the rows, while the viscous effects are taken into account inside. Numerical results are compared with experimental data obtained on a test stand with steady distorted inflow. This comparison shows that this numerical approach is capable of predicting the response of the compressor. This work is part of a larger project aimed at predicting the response of a compressor to a nonuniform inlet flow that is periodic in time, or fully unsteady.

Viscous Flow Computations on a Smooth Cylinders: A Detailed Numerical Study With Validation

2007 ◽  
Author(s):  
Guilherme Vaz ◽  
Christophe Mabilat ◽  
Remmelt van der Wal ◽  
Paul Gallagher
Keyword(s):  
Experimental Data ◽  
Viscous Flow ◽  
Numerical Study ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Reynolds Numbers ◽  
Navier Stokes ◽  
Detached Eddy Simulation ◽  
Time Step ◽  
Drag Forces

The objective of this paper is to investigate several numerical and modelling features that the CFD community is currently using to compute the flow around a fixed smooth circular cylinder. Two high Reynolds numbers, 9 × 104 and 5 × 105, are chosen which are in the so called drag-crisis region. Using a viscous flow solver, these features are assessed in terms of quality by comparing the numerical results with experimental data. The study involves grid sensitivity, time step sensitivity, the use of different turbulence models, three-dimensional effects, and a RANS/DES (Reynolds Averaged Navier Stokes, Detached Eddy Simulation) comparison. The resulting drag forces and Strouhal numbers are compared with experimental data of different sources. Major flow features such as velocity and vorticity fields are presented. One of the main conclusions of the present study is that all models predict forces which are far from the experimental values, particularly for the higher Reynolds numbers in the drag-crisis region. Three-dimensional and unsteadiness effects are present, but are only fully captured by sophisticated turbulence models or by DES. DES seems to be the key to better solve the flow problem and obtain better agreement with experimental data. However, its considerable computational demands still do not allow to use it for engineering design purposes.

A Numerical Study on Sloshing Flows Coupled with Ship Motion—The Anti-Rolling Tank Problem

2002 ◽  
Vol 46 (01) ◽  
pp. 52-62
Author(s):  
Yonghwan Kim
Keyword(s):  
Experimental Data ◽  
Numerical Method ◽  
Numerical Study ◽  
Computational Study ◽  
Three Dimensional ◽  
Ship Motion ◽  
Coupling Effects ◽  
Time Step ◽  
Numerical Result ◽  
Hull Forms

A computational study on the sloshing problem coupled with ship motion in waves is introduced. The ship motion excites the sloshing flow in the ship's liquid cargo, and the slosh-induced forces and moments affect the ship motion in return. This study applies a numerical method to solve the coupling problem of the ship motion and sloshing flow. In particular, it concentrates on the anti-rolling tank, which has the most significant coupling effects of two problems. The three-dimensional sloshing flow has been simulated using the finite-difference method, while the ship motion has been obtained using a time-domain panel method. At each time step, the instantaneous displacement, velocity and acceleration of ship motion have been applied to the excitation of liquid motion, and the corresponding slosh-induced forces and moments have been added to the wave-induced excitation. The computational model is a modified S175 hull, and the computational results have been compared with the experimental data of a supply vessel. Although the two hull forms are not identical, the numerical result for the modified S175 hull shows the same trend of the roll RAOs with experimental data when the anti-rolling tanks are considered. Therefore, the numerical method introduced in this study is expected to be very useful in observing the coupling effects of sloshing and ship motion problems.

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