Edge stresses analysis in laminated thick sandwich cylinder subjected to distributed hygrothermal loading

Ahmadi, Isa

doi:10.1177/1099636216657681

Cited by 10 publications

(8 citation statements)

References 34 publications

(59 reference statements)

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“…Due to the limitation in the experimental data for cores, the properties of applied materials in the present work are considered to be temperature and moisture-independent, based on Refs. [52,53], as follows:…”

Section: Numerical Resultsmentioning

confidence: 99%

Hygrothermal effects on the buckling of soft‐core sandwich plates with composite layered face sheets

2020

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The present work attempts to investigate the influence of hygrothermal environments on the buckling of soft-core sandwich plates with laminated composite face sheets. The stability equations are derived based on piecewise low-order shear deformation theory (PLSDT) and then solved using different methods, depending on the boundary conditions. For fully simply supported sandwich plates, an analytical method is developed which results in some closed-form solutions. For sandwich plates with two parallel simply supported edges and two clamped edges, a semi-analytical solution is established using one-dimensional generalized differential quadrature (GDQ) technique. Finally, for fully clamped sandwich plates, twodimensional GDQ approach is applied to the governing equations. To validate the results of proposed methods, a comparative study with various examples is carried out verifying that the methods in the present work can accurately predict the buckling load of sandwich plates in hot and wet environments. Then, a comprehensive parametric study is performed to show the effects of temperature and moisture content on the buckling of sandwich plates for different parameters such as length-to-thickness ratio, core thickness, and boundary conditions. It is concluded that both temperature and moisture content have significant influences on the buckling behavior of sandwich plates.

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Section: Numerical Resultsmentioning

confidence: 99%

Hygrothermal effects on the buckling of soft‐core sandwich plates with composite layered face sheets

2020

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“…By using Hooke's law, (18), (20), and ( 21), the constitutive relation for an anisotropic material is determined as (22):…”

Section: Boundary and Continuity Conditionsmentioning

confidence: 99%

“…and i ¼ ffiffiffiffiffiffi ffi À1 p , μ 1 ,and μ 2 are the complex roots are calculated from the characteristic equation. 22…”

Section: Stress Solution For the Interior Region Under Biaxial Tensionmentioning

confidence: 99%

Free-edge effects at circular holes in composite laminates under hygrothermomechanical load

Kharghani,

Mittelstedt

2023

Journal of Composite Materials

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In this paper, the free-edge effects which play an important role in the failure analysis of composite laminates are studied. Pure temperature change and its combination with biaxial tension are investigated for a composite plate with a centric circular hole that is adequately small in comparison to the dimension of the plate. Moreover, the laminate is assumed to be thin, the temperature change of all points of the plate is identical and the biaxial tensile load is applied far from the center of the hole. For this purpose, a semi-analytical method based on a two-dimensional thermoelastic boundary layer theory and a minimum potential energy principle is proposed. It is shown that the present method predicts the interlaminar peeling and shear stresses surrounding the hole with good agreement compared to the results obtained by FEM analysis.

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“…To the best of the authors' knowledge, a limited number of investigations provided comprehensive information about the moisture, thermal, mechanical, and physical properties of the core and face sheets of sandwich structures. Therefore, a sandwich structure with the following material properties is considered here [45,46]: Note that, in this subsection, only the fundamental frequencies of structures are considered. Furthermore, except for Fig.…”

Section: Free Vibrations Of Sandwich Beams Under Hygro-thermo-mechanical Loadsmentioning

confidence: 99%

The effects of humidity and temperature on the natural frequencies of axially loaded sandwich beams: a closed-form solution

Kamarian

Song

2021

Eur. Phys. J. Plus

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The present work is aimed to develop a closed-form solution to investigate the effects of hygrothermal environments on the natural frequencies of sandwich beams subjected to compressive axial loads. The piecewise low-order shear deformation theory (PLSDT), Von Karman nonlinear strain-displacement relation, and Hamilton's principle are used to obtain the governing equations of motion for sandwich beams made of composite face sheets and soft cores. A comprehensive comparison is made to verify the present results. It is shown that the developed closed-form solution is sufficiently accurate to estimate the natural frequencies of axially loaded sandwich beams exposed to hot and wet conditions. A parametric study is carried out to indicate the influence of effective parameters such as temperature, humidity, axial mechanical load, core thickness, beam length, and face sheet layup on the vibration of sandwich beams. It is observed that hygrothermal environments have significant effects on the vibrational behavior of the sandwich beams, the extent of these influences depends on the geometric parameters and the amplitude of axial load. The results of present study can provide a theoretical support for the numerical methods and engineering design.

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Edge stresses analysis in laminated thick sandwich cylinder subjected to distributed hygrothermal loading

Cited by 10 publications

References 34 publications

Hygrothermal effects on the buckling of soft‐core sandwich plates with composite layered face sheets

Hygrothermal effects on the buckling of soft‐core sandwich plates with composite layered face sheets

Free-edge effects at circular holes in composite laminates under hygrothermomechanical load

The effects of humidity and temperature on the natural frequencies of axially loaded sandwich beams: a closed-form solution

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