Vibrational Study of a Helicopter Tail Rotor Blade with Different Polymer Inner Core Materials

Voicu, Andrei Daniel; Hadăr, Anton; Vlasceanu, Daniel; Tudose, Daniela Ioana

doi:10.37358/mp.20.2.5363

Cited by 3 publications

(3 citation statements)

References 6 publications

(7 reference statements)

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“…The aerodynamic pressure loading on the tail rotor blade has been validated in previous studies [ 27 ]; the tensile pull being caused by the centrifugal forces acting exterior to the rotation axis. Other materials and structural configurations of interest towards developing a composite helicopter blade have also been studied in previous articles [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics Evaluation of a Single Ply and Multi-Ply Carbon Fiber-Reinforced Plastic Subjected to Tensile and Bending Loads

et al. 2022

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Carbon fiber-reinforced composites represent a broadly utilized class of materials in aeronautical applications, due to their high-performance capability. The studied CFRP is manufactured from a 3K carbon biaxial fabric 0°/90° with high tensile resistance, reinforced with high-performance thermoset molding epoxy vinyl ester resin. The macroscale experimental characterization has constituted the subject of various studies, with the scope of assessing overall structural performance. This study, on the other hand, aims at evaluating the mesoscopic mechanical behavior of a single-ply CFRP, by utilizing tensile test specimens with an average experimental study area of only 3 cm2. The single-ply tensile testing was accomplished using a small scale custom-made uniaxial testing device, powered by a stepper motor, with measurements recorded by two 5-megapixel cameras of the DIC Q400 system, mounted on a Leica M125 digital stereo microscope. The single-ply testing results illustrated the orthotropic nature of the CFRP and turned out to be in close correlation with the multi-ply CFRP tensile and bending tests, resulting in a comprehensive material characterization. The results obtained for the multi-ply tensile and flexural characteristics are adequate in terms of CFRP expectations, having a satisfactory precision. The results have been evaluated using a broad experimental approach, consisting of the Dantec Q400 standard digital image correlation system, facilitating the determination of Poisson’s ratio, correlated with the measurements obtained from the INSTRON 8801 servo hydraulic testing system’s load cell, for a segment of the tensile and flexural characteristics determination. Finite element analyses were realized to reproduce the tensile and flexural test conditions, based on the experimentally determined stress–strain evolution of the material. The FEA results match very well with the experimental results, and thus will constitute the basis for further FEA analyses of aeronautic structures.

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Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics Evaluation of a Single Ply and Multi-Ply Carbon Fiber-Reinforced Plastic Subjected to Tensile and Bending Loads

et al. 2022

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“…The faces of sandwich panels can be made of metal materials (aluminum alloys or stainless steel), non-metallic (polymeric laminates with glass fibers or carbon fibers), various composite materials (reinforced polymeric) or hybrid. The core consists of a light, porous or non-porous material, granulated or special types, consisting of cells (honeycomb type) - [19] or profiles (U, I, T, etc.). As a rule, the core is a composite material that, at a long time load, slowly deforms.…”

Section: Introductionmentioning

confidence: 99%

The Static Behavior of a Ship Deck Panel Made of Composite Materials

Beznea¹,

Baroiu²,

Chirica³

2022

Mater. Plast.

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A study on the static analysis of a naval panel made of composite sandwich materials is presented. By using FEM, the modeling of a naval floor with a length of 5 m and a width of 2.5 m is performed. Two distinct cases, have been performed: the first model consists of the plate and stiffeners made of steel and the second model concerns a panel made of composite material sandwich type steel / SANFoam103 / steel, and the stiffeners made of steel. A parametric study has been performed. The thickness of the steel faces have 6 mm, and for the core of SANFoam have been selected the thicknesses 5 mm, 10 mm, 20 mm, 40 mm.

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“…Usually, the rail pads are made of rubber, ethylene propylene diene monomer (EPDM), thermoplastic polyester elastomer (TPE), high-density polyethylene (HDPE), and ethylene-vinyl acetate (EVA), as presented in Figure 2 [7,8]. Such materials are well known in industry and these are extensively studied from many view points to solve various practical issues [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Track Model with Nonlinear Elastic Characteristic of the Rubber Rail Pad

Mazilu¹,

Arsene²,

Cruceanu³

2021

Mater. Plast.

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This paper presents a new basic nonlinear track model consisting of an infinite Euler-Bernoulli beam (rail) resting on continuous foundation with two elastic layers (rail pad and ballast bed) and intermediate inertial layer (sleepers). The two elastic layers have bilinear elastic characteristic obtained from the load-displacement characteristic of the rail pad and ballast. A time-varying load with two components - time-constant one and harmonic other, representing the wheel/rail contact force is considered as the track model input. Rail deflection due to the time-constant component of the load is obtained solving the nonlinear equations of the balance position. Subsequently, the structure of the nonhomogeneous foundation is determined. Dynamic rail response in terms of receptance due to the harmonic component of the load is calculated using the linearised track model with nonhomogeneous elastic characteristic. Influence of the time-constant component and the reflected waves due to the nonhomogeneous foundation are presented.

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Vibrational Study of a Helicopter Tail Rotor Blade with Different Polymer Inner Core Materials

Cited by 3 publications

References 6 publications

Mechanical Characteristics Evaluation of a Single Ply and Multi-Ply Carbon Fiber-Reinforced Plastic Subjected to Tensile and Bending Loads

Mechanical Characteristics Evaluation of a Single Ply and Multi-Ply Carbon Fiber-Reinforced Plastic Subjected to Tensile and Bending Loads

The Static Behavior of a Ship Deck Panel Made of Composite Materials

Track Model with Nonlinear Elastic Characteristic of the Rubber Rail Pad

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