EFFECTS of ROTATION of MATERIAL AXES ON FREE FLEXURAL VIBRATIONS of CENTRALLY BONDED SYMMETRIC DOUBLE DOUBLER JOINT in COMPOSITE MINDLIN PLATES or PANELS

2011-11-17
Yuceoglu, U.
Guvendik, O.
The present study investigates the serious effects of rotation of material axes on the free dynamic response of composite plates or panels with "Bonded Double Doubler Mint Systems". The "Plate Adherends" and the "Upper and Lower Doubler Plates" are connected through the relatively very thin adhesive layers. The "Bonded Double Doubler Joint System" is considered in taans of the "System. 1" and the "System.2". In the "System. 1", the material directions of "Plate Adherends" are rotated 90(0) (about z-axis) while there is no change in the material axes of the "Double Doubler Plates". In the "System.2", the material directions of the "Double Doubler Plates" are rotated 90(0) (about z-axis), while there is no change in the material axes of the "Plate Adherends". All plate elemnts of the "System. 1" and the "System.2" are assumed to be dissimilar "Orthotropic Mindlin Plates" with the transverse shear deformations and the transverse (or bending) moments of inertia and the rotary moments of inertia. The upper and lower adhesive layers are linearly elastic continua with dissimilar material properties and with unequal thicknesses. The damping effects in. all plate elements and also in adhesive layers are neglected. The entire theoretical analysis for both "Systems.1 and 2" is based on the "Orthotropic Mindlin Plate Theory". For this purpose, the dynamic equations of the left and the right "Plate adherends" and of the "Upper and Lower Doubler Plates" and the equations of the adhesive layers are combined to-gather with the stress resultant - displacement expressions of the plate elements. Then, after some algebric manipulations and combinations, and with the "Classical Levy's Solutions" the original dynamic equations are finally reduced into the two new sets of the "Governing System of the First Order O.D.E's" in compact matrix forms with the "state vectors" for the "System. 1" and "System.2", respectively. In this way, the original "Initial and Boundary Value Problem" (or the free vibrations problem) is converted to the "Multi - Point Boundary Value Problem" of Mechanics and Physiscs. In the case of both "Systems.1 and 2", these results facilitate the direct application of the present method of solution that is the "Modified Transfer Matrix Method (MTMM) (with Interpolation Polynomials)". The aforementioned "Governing Equations" for both "Systems.1 and 2" are numerically integreted by making use of the "(MTMM) (with Interpolation Polynomials)". Thus, the natural frequencies and the mode shapes of the "Systems. 1" and the "System.2" are graphically presented for the same "Support Conditions". The comparison of the numerical results corresponding to each "System. 1" and "System.2" for the same "Support Conditions" is considered leading to some very important conclusions.

Suggestions

EFFECTS of POSITION (or LOCATION) of NON-CENTRALLY BONDED SYMMETRIC DOUBLE LAP JOINT (or SYMMETRIC DOUBLE DOUBLER JOINT) on BENDING VIBRATIONS of COMPOSITE MINDLIN PLATES or PANELS
Yuceoglu, U.; Guvendik, O. (2010-11-18)
In the present study, the "Effects of Position (or Location) of Non-Centrally Bonded Symmetric Double Doubler Joint in Composite Mindlin Plates or Panels" are theoretically analyzed and are numerically solved in some detail. The "Plate Adherends" and the upper and lower "Doubler Plates" of the "Bonded Joint System" are considered as dissimilar, orthotropic "Mindlin Plates" joined through the dissimilar upper and lower very thin adhesive layers. The transverse and rotary moments of inertia are included in th...
Free Vibrations of Composite Plates Stiffened by Two Adhesively Bonded Plate Strips
Javanshir, Jaber; Farsadi, Touraj; Yuceoglu, Umur (2012-07-01)
In this study, the free flexural (or bending) vibration response of composite base-plate or panel systems stiffened by two adhesively bonded plate strips are theoretically analyzed in detail and numerically solved in terms of the mode shapes with their natural frequencies. Additionally, some important parametric studies are also included in the present study. The aforementioned bonded and stiffened system is composed of an orthotropic Mindlin base plate or panel stiffened or reinforced by the dissimilar, or...
Free bending vibrations of a centrally bonded symmetric double lap joint (or symmetric double doubler joint) with a gap in mindlin plates or panels
Yuceoglu, U.; Guvendik, O.; Ozerciyes, V. (2007-11-16)
In this present study, the "Free Bending Vibrations of a Centrally Bonded Symmetric Double Lap Joint (or Symmetric Double Doubler Joint) with a Gap in Mindlin Plates or Panels" are theoretically analyzed and are numerically solved in some detail. The "plate adherends" and the upper and lower "doubler plates" of the "Bonded Joint" system are considered as dissimilar, orthotropic "Mindlin Plates" joined through the dissimilar upper and lower very thin adhesive layers. There is a symmetrically and centrally lo...
Effect of material properties on interaction of ceramic and glass flyer plates with hypervelocity jet
Deniz, Tansel; Yıldırım, Raif Orhan (2022-02-01)
A study on the effect of material properties on the interaction of explosively driven ceramic and glass plates with shaped charge jets is performed in order to bolster future studies on the design of reactive cassettes with non-steel flyer plates. A symmetric steel reactive cassette construction is taken as a base, and front and back plates are selectively changed with ceramic or glass plates keeping the areal densities similar. Plates manufactured from two different grades of alumina, silicon carbide, boro...
Evaluation of the Effect of Spar Cap Fiber Angle of Bending-Torsion Coupled Blades on the Aero-Structural Performance of Wind Turbines
Şener, Özgün; Gozc, M. Ozan; Kayran, Altan (ASME International, 2018-08-01)
This paper presents a comprehensive study of the evaluation of the effect of spar cap fiber orientation angle of composite blades with induced bending–torsion coupling (IBTC) on the aero-structural performance wind turbines. Aero-structural performance of wind turbines with IBTC blades is evaluated with the fatigue load mitigation in the whole wind turbine system, tower clearances, peak stresses in the blades, and power generation of wind turbines. For this purpose, a full E-glass/epoxy reference blade has ...
Citation Formats
U. Yuceoglu and O. Guvendik, “EFFECTS of ROTATION of MATERIAL AXES ON FREE FLEXURAL VIBRATIONS of CENTRALLY BONDED SYMMETRIC DOUBLE DOUBLER JOINT in COMPOSITE MINDLIN PLATES or PANELS,” 2011, p. 223, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65691.