Coupled vibrations of viscoelastic three-layer composite plates. 1. Formulation of problem

AbstractIn this paper, we combine a new higher-order layerwise formulation and collocation with radial basis functions for predicting the static deformations and free vibration behavior of three-layer composite plates. The skins are modeled via a first-order theory, while the core is modeled by a cubic expansion with the thickness coordinate. Through numerical experiments, the numerical accuracy of this strong-form technique for static and vibration problems is discussed.

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On the problems of nonhomogeneous and anisotropic elastic layer-composite plates

Vietnam Journal of Mechanics ◽

10.15625/0866-7136/10175 ◽

1994 ◽

Vol 16 (4) ◽

pp. 1-10

Author(s):

Dao Huy Bich

Keyword(s):

Experimental Data ◽

Elastic Layer ◽

Composite Plates ◽

Homogenization Method ◽

Effective Modulus ◽

Elastic Plates ◽

Dynamic Problems ◽

Layer Composite ◽

Material Behaviors ◽

Anisotropic Elastic

Using the homogenization method problems of nonhomogeneous and anisotropic elastic layer composite plates reduce to the problems of homogeneous and anisotropic elastic plates. The formulae of effective modulus theory determining material behaviors in this cases are given and can be checked by experimental data. Obtained results allow to analyze static and dynamic problems of composite plates by well - know methods.

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Approaches to the evaluation of the mechanical properties of single-layer composite plates made of recyclable polymeric and protein materials

10.24264/icams-2020.i.8 ◽

2020 ◽

Author(s):

Ion Durbaca ◽

Radu Iatan ◽

Elena Surdu ◽

Dana-Claudia Farcas-Flamaropol

Keyword(s):

Composite Material ◽

Mechanical Characteristics ◽

Single Layer ◽

Composite Plates ◽

Structural Elements ◽

Efficient Design ◽

Protein Matrix ◽

Layer Composite ◽

Definition Of

This paper deals with the theoretical and experimental mechanical characteristics of composite plates obtained from recyclable polymer and protein matrix and fibrous reinforcement. The definition of the theoretical model of the monolayer composite material with its structural elements and the physical-mechanical evaluation of its characteristics leads to the optimal and efficient design and use of all products made of such materials. By the theoretical and experimental determination of the mechanical characteristics that define the properties of the composite material, it can be decided on its use in specific industrial technical applications.

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A Finite Element Model for Dynamic Analysis of Triple-Layer Composite Plates with Layers Connected by Shear Connectors Subjected to Moving Load

Materials ◽

10.3390/ma12040598 ◽

2019 ◽

Vol 12 (4) ◽

pp. 598 ◽

Cited By ~ 6

Author(s):

Hoang-Nam Nguyen ◽

Tan-Y. Nguyen ◽

Ke Tran ◽

Thanh Tran ◽

Truong-Thinh Nguyen ◽

...

Keyword(s):

Finite Element ◽

Moving Load ◽

Composite Plates ◽

Element Model ◽

Layered Composite ◽

Ship Building ◽

Shear Connectors ◽

Composite Layers ◽

Layer Composite ◽

Mindlin’S Theory

Triple-layered composite plates are created by joining three composite layers using shear connectors. These layers, which are assumed to be always in contact and able to move relatively to each other during deformation, could be the same or different in geometric dimensions and material. They are applied in various engineering fields such as ship-building, aircraft wing manufacturing, etc. However, there are only a few publications regarding the calculation of this kind of plate. This paper proposes novel equations, which utilize Mindlin’s theory and finite element modelling to simulate the forced vibration of triple-layered composite plates with layers connected by shear connectors subjected to a moving load. Moreover, a Matlab computation program is introduced to verify the reliability of the proposed equations, as well as the influence of some parameters, such as boundary conditions, the rigidity of the shear connector, thickness-to-length ratio, and the moving load velocity on the dynamic response of the composite plate.

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Effect of ply orientation on the in-plane vibration of single-layer composite plates

Journal of Sound and Vibration ◽

10.1016/j.jsv.2007.10.028 ◽

2008 ◽

Vol 312 (1-2) ◽

pp. 94-108 ◽

Cited By ~ 16

Author(s):

Roland L. Woodcock ◽

Rama B. Bhat ◽

Ion G. Stiharu

Keyword(s):

Single Layer ◽

Composite Plates ◽

Plane Vibration ◽

Layer Composite ◽

Ply Orientation

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Effect of Potassium Phosphate Content in Aluminosilicate Matrix on Mechanical Properties of Carbon Prepreg Composites

Materials ◽

10.3390/ma15010061 ◽

2021 ◽

Vol 15 (1) ◽

pp. 61

Author(s):

Eliška Kohoutová ◽

Pavlína Hájková ◽

Jan Kohout ◽

Aleš Soukup

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Potassium Phosphate ◽

Composite Plates ◽

Phosphate Content ◽

Layer Composite ◽

Weave Fabric ◽

The Matrix ◽

Positive Effect ◽

Alkali Activated

Six matrices based on alkali-activated aluminosilicate with different amounts of potassium phosphate were prepared for the production of six-layer composite plates. The addition of potassium phosphate in the matrix was 2 wt%, 4 wt%, 6 wt%, 8 wt% and 10 wt% of its total weight. The matrix without the potassium phosphate was also prepared. The aim of this study was to determine whether this addition has an effect on the tensile strength or Young’s modulus of composites at temperatures up to 800 °C. Changes in the thickness and weight of the samples after this temperature were also monitored. Carbon plain weave fabric was chosen for the preparation of the composites. The results show that under normal conditions, the addition of potassium phosphate has no significant effect on the mechanical properties; the highest measured tensile strengths were around 350 MPa. However, at temperatures of 600 °C and 800 °C the addition of potassium phosphate had a positive effect, with the tensile strength of the composites being up to 300% higher than the composites without the addition. The highest measured values of composites after one hour at 600 °C were higher than 100 MPa and after 1 h at 800 °C higher than 85 MPa.

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Coupled vibrations of viscoelastic three-layer composite plates. 2. Numerical experiments

Vestnik of Saint Petersburg University Mathematics Mechanics Astronomy ◽

10.21638/spbu01.2021.108 ◽

2021 ◽

Vol 8 (1) ◽

pp. 88-100

Author(s):

Victor M. Ryabov ◽

◽

Boris A. Yartsev ◽

Ludmila V. Parshina ◽

◽

...

Keyword(s):

Composite Plates ◽

Vibration Modes ◽

Isotropic Layer ◽

Coupled Vibration ◽

Relative Thickness ◽

Viscoelastic Polymer ◽

Proper Form ◽

Numerical Studies ◽

Layer Composite ◽

The Waves

Results of numerical studies of the influence of reinforcement orientation of hard layers and the relative thickness of the soft layer of an isotropic viscoelastic polymer on the values of natural frequencies and coefficients of mechanical losses are discussed. In a symmetrical three-layer plate, a bending-torsion interaction arises, generating mutual transformations of the eigenmodes of the coupled vibration modes, if at least one of its own forms in plate directions is characterized by an even number quarters of a wave, and another proper form - an odd number of quarters the waves. In an unsymmetrical asymmetric three-layer plate, bending-bending interaction arises, generating mutual transformations eigenmodes of coupled vibration modes in two mutually orthogonal planes if in the main directions of the plate both of their own forms characterized by either an even or an odd number of quarters of a wave. It was found that each mode of natural vibrations of three-layer plates corresponds to the effective relative thickness of the soft isotropic layer viscoelastic polymer.

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