Application of nonlocal strain–stress gradient theory and GDQEM for thermo-vibration responses of a laminated composite nanoshell

Engineering With Computers, Год журнала: 2020, Номер 37(4), С. 3359 - 3374

Опубликована: Март 14, 2020

Язык: Английский

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Viscoelastic dynamics and static responses of a graphene nanoplatelets-reinforced composite cylindrical microshell

Mechanics Based Design of Structures and Machines, Год журнала: 2020, Номер 50(2), С. 509 - 536

Опубликована: Фев. 6, 2020

In this study, a cylindrical microshell stability reinforced by graphene nanoplatelets is investigated while an axial load applied uniformly. addition, viscoelastic foundation covers the composite nanostructure. Therefore, impacts of small scale parameter are studied nonlocal strain gradient theory (NSGT) considered. The present research deals for first time with consideration viscoelastic, strain–stress size-dependent parameters along taking into account various boundary conditions (BCs), especially C-F ones put effect on proposed theory. governing equations (G.Eqs) and BCs have been obtained utilizing energy method solved assistance generalized differential quadrature (GDQM). Besides, validation results, results current model compared to acquired from analytical method. show that, foundation, patterns GPL distribution, parameter, length layers' numbers, condition as well weight function considerable impact GPLRC microshell. Another significant result that; B.Cs, at higher value l/R influence gGPL dimensionless buckling structure much more remarkable in comparison lower one which section detail. investigation would be informative design fabrication microactuators microsensors.

Язык: Английский

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Critical voltage, thermal buckling and frequency characteristics of a thermally affected GPL reinforced composite microdisk covered with piezoelectric actuator

Mechanics Based Design of Structures and Machines, Год журнала: 2020, Номер 50(4), С. 1331 - 1353

Опубликована: Апрель 8, 2020

Due to the remarkable progress in field of manufacturing process, smart composites have become desired target for high-tech engineering applications. Accordingly, first time, thermal buckling, critical voltage and vibration response a thermally affected graphene nanoplatelet reinforced composite (GPLRC) microdisk environment are explored with aid generalized differential quadrature method (GDQM). Also, current microstructure is coupled piezoelectric actuator (PIAC). The extended form Halpin-Tsai micromechanics used acquire elasticity structure, whereas, variation expansion, Poisson’s ratio, density through thickness direction determined by rule mixtures. Hamilton’s principle implemented establish governing equations boundary conditions GPLRC joint PIAC. compatibility satisfied taking perfect bonding between core PIAC into consideration. Maxwell’s equation employed capture piezoelectricity effects. numerical results revealed important role distribution patterns weight fraction GPL (gGPL), non-dimensional (hp/h), outer inner ratio radius (Ro/Ri) applied on frequency behavior, buckling system. Another valuable consequence that influence hp parameter hardly dependent value temperature changes (ΔT). favorable suggestion this survey optimized designing microsized circular plate should pay special attention pattern 3 GPLs, because increasing gGPL structure increases but other GPL, phenomenon inverse.

Язык: Английский

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Research on the Stability and Treatments of Natural Gas Storage Caverns With Different Shapes in Bedded Salt Rocks

IEEE Access, Год журнала: 2020, Номер 8, С. 18995 - 19007

Опубликована: Янв. 1, 2020

Because of complex geo-conditions, many caverns by solution mining in bedded salt rocks have different irregular shapes. To verify the feasibility using irregular-shaped for underground gas storage (UGS), four typical cavern-shapes are selected, and stability each type is evaluated compared numerical simulation methods. The results show that UGS cavern with wall shape has lowest volume shrinkage displacement rock, but larger plastic zones appear their overhanging concave parts. Ellipsoid-shape best stability. Cylinder-shape cuboid-shape poorest In these two types caverns, large deformations occur roof sidewall, which pose a great potential inducing collapse rock. By comparison characteristics positions we found much greater influence than sidewall on cavern. must be designed as an arch to improve Treatments irregularly shaped changing operational pressure utilization way or modifying caverns' also discussed. So, this study not only determined state rocks, provides ways modify applications.

Язык: Английский

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Daily natural gas load forecasting based on the combination of long short term memory, local mean decomposition, and wavelet threshold denoising algorithm

Journal of Natural Gas Science and Engineering, Год журнала: 2021, Номер 95, С. 104175 - 104175

Опубликована: Июль 31, 2021

Язык: Английский

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