Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

Loja, M. A. R.

doi:10.1155/2017/7842413

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…Otherwise, to perform free vibration analysis, only the load vector will be null. Assuming free harmonic vibrations, the equilibrium equation will become Equation ( 14) [31,34,35]:…”

Section: Displacement Field and Equilibrium Equationsmentioning

confidence: 99%

Static and Free Vibration Analyses of Functionally Graded Plane Structures

Gaspar,

Loja,

Barbosa

2023

J. Compos. Sci.

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In recent years, the use of functionally graded materials has been the focus of several studies due to their intrinsic ability to be tailored according to the requirements of structures while minimising abrupt stress transitions commonly found in laminated composites. In most studies, the materials’ mixture gradient is established through a structural component, i.e., thickness, which is known to visibly enhance structural behaviour. However, depending on the type of structure, it is important to exploit the possibility of building a structure using other gradient directions. The innovative characteristic of this work, which aims to study plane truss and frame-type structures made of functionally graded materials, lies in the specificity that the materials’ mixture gradient occurs as a function of a geometric structure feature, i.e., for example, the structure height, rather than the more usual approach, as a component dependence, i.e., through a member thickness or even along its length. The performance of the present model is illustrated through a set of case studies, and where possible, the results achieved are compared with more traditional solutions.

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“…Otherwise, to perform free vibration analysis, only the load vector will be null. Assuming free harmonic vibrations, the equilibrium equation will become Equation ( 14) [31,34,35]:…”

Section: Displacement Field and Equilibrium Equationsmentioning

confidence: 99%

Static and Free Vibration Analyses of Functionally Graded Plane Structures

Gaspar,

Loja,

Barbosa

2023

J. Compos. Sci.

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“…The authors also provided a summary and an outlook on foreseen potential developments in the field. The impact on the viscoelastic behavior of sandwich structures by integrating through-thickness graded core materials and nanocomposite skins with homogeneous or graded properties where the viscoelastic behavior of the sandwich core was modeled using the complex method was investigated by Loja [18]. It was concluded that effective design solutions for specific structural requirements can be achieved by considering such material design variables/profiles.…”

Section: Introductionmentioning

confidence: 99%

Variability on Functionally Graded Plates’ Deflection Due to Uncertainty on Carbon Nanotubes’ Properties

Carvalho,

Martins,

Mota

et al. 2024

MCA

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Carbon nanotubes are widely used as material reinforcement in diverse fields of engineering. Being that their contribution is significant to improving the mean properties of the resulting materials, it is important to assess the influence of the variability on carbon nanotubes’ material and geometrical properties to structures’ responses. This work considers functionally graded plates constituted by an aluminum continuous phase reinforced with single-walled or multi-walled carbon. The nanotubes' weight fraction evolution through the thickness is responsible for the plates’ functional gradient. The plates’ samples are simulated considering that only the nanotubes’ material and geometrical characteristics are affected by uncertainty. The results obtained from the multiple regression models developed allow us to conclude that the length of the nanotubes has no impact on the maximum transverse displacement of the plates in opposition to the carbon nanotubes’ weight fraction evolution, their internal and external diameters, and the Young’s modulus. The multiple regression models developed can be used as alternative prediction tools within the domain of the study.

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“…The reduction of vibrations is advantageous in several mechanical systems, since it allows an increase in the service life and a reduction in its weight. In a previous work [7], Loja studied, among others, a sandwich beam with graded metal-graphene nanocomposites skins and a soft core, since soft and lightweight cores allow a viscoelastic damped behavior. This kind of behavior is of great interest in most engineering applications not only because it is responsible for the vibration attenuation but also for greater fatigue and impact resistance.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Porous Functionally Graded Nanocomposite Materials

Mota

Loja

2019

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Materials used in biomedical applications need to cope with a wide set of requisites, one of them being their structural adequacy to a specific application. Thus, it is important to understand their behavior under specified standard cases, namely concerning their structural performance. This objective constituted the focus of the present study, where nanocomposite functionally graded materials integrating different porosity distributions were analyzed. To this purpose a set of numerical simulations based on the finite element method, reproducing American Society for Testing and Materials (ASTM) tensile and bending tests were considered. The results obtained show a good performance of the models implemented through their preliminary verification. It is also possible to conclude that carbon nanotubes and porosity distributions provide different and opposite effects in the context of the nanocomposite materials analyzed.

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Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

Cited by 6 publications

References 32 publications

Static and Free Vibration Analyses of Functionally Graded Plane Structures

Static and Free Vibration Analyses of Functionally Graded Plane Structures

Variability on Functionally Graded Plates’ Deflection Due to Uncertainty on Carbon Nanotubes’ Properties

Mechanical Behavior of Porous Functionally Graded Nanocomposite Materials

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