Optimal locations of magnetorheological fluid pockets embedded in an elastically supported honeycomb sandwich beams for supersonic flutter suppression

2019 ◽  
Vol 74 ◽  
pp. 81-95 ◽  
Author(s):  
Mohammad Nezami ◽  
Behnam Gholami
Keyword(s):  
Magnetorheological Fluid ◽  
Sandwich Beams ◽  
Flutter Suppression ◽  
Honeycomb Sandwich ◽  
Supersonic Flutter ◽  
Elastically Supported

Semi-active vibration control of MRF core PMC cantilever sandwich beams: Experimental study

2020 ◽  
Vol 234 (4) ◽  
pp. 574-585
Author(s):  
J Vipin Allien ◽  
Hemantha Kumar ◽  
Vijay Desai
Keyword(s):  
Glass Fiber ◽  
Matrix Composite ◽  
Polymer Matrix ◽  
Polyester Resin ◽  
Magnetorheological Fluid ◽  
Polymer Matrix Composite ◽  
Sandwich Beams ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Fluid Core

The semi-active vibration control of sandwich beams made of chopped strand mat glass fiber reinforced polyester resin polymer matrix composite (PMC) and magnetorheological fluid (MRF) core were experimentally investigated in this study. Two-, four- and six-layered glass fiber reinforced polyester resin polymer matrix composites were prepared using the hand-layup technique. The magnetorheological fluid was prepared in-house with 30% volume of carbonyl iron powder and 70% volume of silicone oil. Nine cantilever sandwich beams of varying thicknesses of the top and bottom layers glass fiber reinforced polyester resin polymer matrix composite beams and middle magnetorheological fluid core were prepared. The magnetorheological fluid core was activated with a non-homogeneous magnetic field using permanent magnets. The first three modes, natural frequencies and damping ratios of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams were determined through free vibration analysis using DEWESoft modal analysis software. The amplitude frequency response of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams through forced vibration analysis was determined using LabVIEW. The effect of various parameters such as magnetic flux density, thickness of glass fiber reinforced polyester resin polymer matrix composite layers and magnetorheological fluid core layer on the natural frequencies, damping ratio and vibration amplitude suppressions of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams was investigated. Based on the results obtained, 2 mm thickness top and bottom layers glass fiber reinforced polyester resin polymer matrix composite and 5 mm thickness magnetorheological fluid core sample have achieved a high shift in increased natural frequency, damping ratio and vibration amplitude suppression under the influence of magnetic flux density.

Non-Linear Stress-Strain Effects in the Flexural Wrinkling of Carbon Fibre Honeycomb Sandwich Beams

1982 ◽  
Vol 33 (1) ◽  
pp. 1-24 ◽  
Author(s):  
A.K. Ditcher ◽  
J.P.H. Webber
Keyword(s):  
Carbon Fibre ◽  
Sandwich Beam ◽  
Sandwich Beams ◽  
Stress Strain ◽  
Tangent Moduli ◽  
Honeycomb Sandwich ◽  
Non Linear ◽  
Theoretical Predictions ◽  
Failure Loads ◽  
Carbon Fibre Reinforced Plastic

SummaryA theoretical analysis of the flexural wrinkling of a honeycomb sandwich beam with laminated faces having non-linear stress-strain behaviour is presented. Appropriate tangent moduli are used in the constitutive equations for the compression face and a double iteration technique is used to calculate wrinkling loads. Numerical results are given for sandwich beams with unidirectional and cross-ply carbon fibre reinforced plastic (CFRP) faces. Experimental failure loads of sandwich beams are compared with theoretical predictions, and, in general, the agreement between the two is good.

scholarly journals Kinematics effect on honeycomb sandwich beams vibration

2017 ◽  
Vol 18 (3) ◽  
pp. 302
Author(s):  
I. Chenini ◽  
R. Nasri ◽  
C. Mrad ◽  
Y. Abdelli
Keyword(s):  
Sandwich Beams ◽  
Honeycomb Sandwich

Experimental Investigation of Damage Characteristics in Steel Honeycomb Sandwich Beams

2010 ◽  
Vol 452-453 ◽  
pp. 557-560
Author(s):  
Jie Lu ◽  
Guang Ping Zou ◽  
Bao Jun Liu
Keyword(s):  
Failure Process ◽  
Sandwich Beams ◽  
Characteristic Parameters ◽  
Damage Initiation ◽  
Damage Characteristics ◽  
Damage And Failure ◽  
Honeycomb Sandwich ◽  
Bending Loads ◽  
Ae Counts ◽  
Good Agreement

In this work the fracture process of steel honeycomb sandwich beams has been investigate by situ acoustic emission(AE) technique. Pre-cracks were made both for L-direction and W-direction specimens subjected to out-plane three-points bending loads. Damage initiation sites were observed in the vicinity of the crack tip. A series of curves among the AE counts, AE hits, AE amplitude, AE energy and loading time were obtained. Damage characteristics were discussed based on the above parameters. The results indicate AE characteristic parameters can reflect the damage and failure process of specimens. A good agreement was found between the experimental and analytical results.

Experimental Investigation of Damage Characteristics in Steel Honeycomb Sandwich Beams

2011 ◽  
Vol 675-677 ◽  
pp. 685-688
Author(s):  
Jie Lu ◽  
Guang Ping Zou ◽  
Bao Jun Liu
Keyword(s):  
Failure Modes ◽  
Failure Process ◽  
Sandwich Beams ◽  
Damage Initiation ◽  
Damage Characteristics ◽  
Damage And Failure ◽  
Honeycomb Sandwich ◽  
Bending Loads ◽  
Good Agreement

Honeycomb sandwich structures are generally designed to carry flexural loads. However, mechanical properties can be influenced by accidental impacts, or service conditions. Thus a nondestructive detection testing is desired for them. In contrast to many conventional nondestructive evaluation (NDE) techniques, acoustic emission (AE) technique permits continuous damage inspection, classification and identification of failure modes in real time. In this work the fracture process of steel honeycomb sandwich beams has been investigated by in-situ AE technique. Pre-cracks were made both for L-direction and W-direction specimens subjected to three-points bending loads. Damage initiation sites were observed in the vicinity of the crack tip. A series of curves among the AE hits, AE amplitude, AE energy and loading time were obtained. Damage characteristics were discussed based on the above parameters. The results indicate AE characteristic parameters can reflect the damage and failure process of specimens. A good agreement was found between the experimental and analytical results.

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