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1
artículo
Publicado 2015
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This paper presents an analytical solution for the thermoelastic bending analysis of advanced composite sandwich plates by using a new quasi-3D hybrid type HSDT with 6 unknowns which is based on a generalized formulation. In addition, the nonlinear term of the temperature field is included in the generalized mathematical formulation in such way that it can be freely chosen and if desired can be different from the shear strain shape functions of the displacement field. So, infinite quasi-3D hybrid type HSDTs with just 6 unknowns can be derived from the present generalized formulation. The thermoelastic bending governing equations are obtained through the principle of virtual works and solved via Navier Method. Interesting results are obtained and compared with quasi-3D and 2D HSDTs. Transverse shear stress results are strongly influenced by nonlinear temperature field and for different HS...
2
3
artículo
The purpose of this paper is to study the vibrational behavior of advanced composite plates by using a novel first shear deformation theory (FSDT). This theory contains only four unknowns, with is even less than the classical FSDT. The governing equations are derived by employing the Hamilton's principles and solved via Navier's solution. The present results were validiated by comparing it with the 3D, classical FSDT and other solutions available in the literature. Shear correction factor apper to be unfovarable in some cases (case dependent). Finally, authors recommend further study of this new manner to model the displacement field.
4
artículo
Publicado 2019
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The mechanical behavior of advanced composites can be modeled mathematically through unknown variables and Shear Strain Thickness Functions (SSTFs). Such SSTFs can be of polynomial or non-polynomial nature and some parameters of non-polynomial SSTFs can be optimized to get optimal results. In this paper, these parameters are called “r” and “s” and they are the argument of the trigonometric SSTFs introduced within the Carrera Unified Formulation (CUF). The Equivalent Single Layer (ESL) governing equations are obtained by employing the Principle of Virtual Displacement (PVD) and are solved using Navier method solution. Furthermore, trigonometric expansion with Murakami theory was implemented in order to reproduce the Zig-Zag effects which are important for multilayer structures. Several combinations of optimization parameters are evaluated and selected by different criteria of aver...
5
artículo
Publicado 2015
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The closed-form solution of a generalized hybrid type quasi-3D higher order shear deformation theory (HSDT) for the bending analysis of functionally graded shells is presented. From the generalized quasi-3D HSDT (which involves the shear strain functions “f(ζ)” and “g(ζ)” and therefore their parameters to be selected “m” and “n”, respectively), infinite six unknowns' hybrid shear deformation theories with thickness stretching effect included, can be derived and solved in a closed-from. The generalized governing equations are also “m” and “n” parameter dependent. Navier-type closed-form solution is obtained for functionally graded shells subjected to transverse load for simply supported boundary conditions. Numerical results of new optimized hybrid type quasi-3D HSDTs are compared with the first order shear deformation theory (FSDT), and other quasi-3D HSDTs. The...
6
artículo
Publicado 2019
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The mechanical behavior of advanced composites can be modeled mathematically through unknown variables and Shear Strain Thickness Functions (SSTFs). Such SSTFs can be of polynomial or non-polynomial nature and some parameters of non-polynomial SSTFs can be optimized to get optimal results. In this paper, these parameters are called “r” and “s” and they are the argument of the trigonometric SSTFs introduced within the Carrera Unified Formulation (CUF). The Equivalent Single Layer (ESL) governing equations are obtained by employing the Principle of Virtual Displacement (PVD) and are solved using Navier method solution. Furthermore, trigonometric expansion with Murakami theory was implemented in order to reproduce the Zig-Zag effects which are important for multilayer structures. Several combinations of optimization parameters are evaluated and selected by different criteria of aver...
7
objeto de conferencia
Publicado 2020
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ABSTRACT This work evaluated the influence of the concentration of NaOH (100, 200 and 300 g/L NaOH) in the mercerization process at 25 °C for 1 h, and of the percentage (15, 20 and 25% m/m) of Mauritia flexuosa fibers on impact resistance in a polyester matrix composite. The polyester matrix composite was obtained by the compression molding process, at a constant pressure of 24 MPa. The obtained plates had a dimension of 130 mm long x 80 mm wide x 3.4 mm thick. Specimens for the impact assay were extracted from the obtained plates under the EN ISO 179-1 standard. Likewise, the fiber-reinforced composites without treatment were also evaluated, all the fibers were characterized before and after the NaOH treatment by means of the chemical characterization of the fiber, absorption percentage, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy ( FT-IR). The result...
8
artículo
Publicado 2021
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A 32-year-old male patient attended in the Fixed Partial Prosthesis Clinic (PPF), of the Araçatuba Dental School-Paulista State University, stating as the main complaint that his anterior teeth were “ugly and broken”. After clinical examination, the patient was diagnosed with temporomandibular disorder, bruxism and the presence of dental erosions (intrinsic and extrinsic). It was proposed to be followed up by a gastroenterologist and rehabilitation with metal-free prostheses (11, 12, 21 and 22) made of lithium silicate reinforced with zirconium by the CAD / CAM system were proposed. After endodontics of the anterior-superior incisors, the anatomized fiberglass posts with composite resin were installed; the impression was made with retractor wire and addition silicone. After aesthetic testing and occlusal adjustments, the e-max Ceram PPF¨s were prepared for resin cementation with th...
9
artículo
Publicado 2021
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A quasi-three-dimensional solution for the bending analysis of simply supported orthotropic piezoelectric shallow shell panels subjected to thermal, mechanical and electrical potential is introduced. The mechanical governing equations are derived in term of three-dimensional equilibrium relations and the classical Maxwell's equations. The trough-the-thickness temperature is modeled by the Fourier's heat conduction equation. The coupled partial differential equations are solved by Navier closed form solutions. The trough-the-thickness profile for electrical potential, temperature profile and displacements is obtained by using a quasi-exact method so-called the differential quadrature method (DQM). Chebyshev polynomials of the third kind are used as the basis functions and the grid thickness domain discretization for the DQM. The interlaminar conditions for transverse stresses, temperature...
10
artículo
Publicado 2008
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El estudio del clima es imprescindible para explicar la geodinámica externa en la vertiente del Pacífico de los Andes Centrales, entre 15°S y 19°S), debido a que los procesos mediante los cuales se desarrolla el modelado del relieve o morfogénesis están controlados por las variables termo-pluviométricas y la fito-estabilización. Además, la geodinámica interna de la región se encuentra igualmente relacionada con las condiciones climáticas, que determinan la cuantía del aporte de sedimentos a la fosa oceánica (Kulm et al. 1977), afectando a la tasa de erosión por subducción en el plano de contacto entre las placas y a la composición de los magazas que se forman bajo el erógeno andino. En esta ponencia se analizan los efectos del clima en la geodinámica externa, en un marco teórico en el que se considera que un sistema morfoclimático es un conjunto integrado por los age...
11
artículo
Publicado 2021
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Paciente masculino, de 32 años, acudió a la Clínica de Prótesis Parcial Fija (PPF), de la Facultad de Odontología de Araçatuba-Universidad Estadual Paulista, manifestando como queja principal que sus dientes anteriores estaban “feos y rotos”. Después del examen clínico, el paciente fue diagnosticado con desorden temporomandibular, bruxismo y presencia de erosiones dentarias (intrínsecas y extrínsecas). Se propuso el acompañamiento de un médico gastroenterólogo y la rehabilitación con prótesis libres de metal (11, 12, 21 y 22) confeccionadas en silicato de litio reforzado con zirconio por el sistema CAD/CAM. Después de la endodoncia de los incisivos antero-superiores, fueron instalados los pernos de fibra de vidrio anatomizados con resina compuesta; la impresión fue realizada con hilo retractor y silicona de adición. Después de la prueba estética y ajustes oclusale...
