Thermal buckling analysis of a functionally graded microshell based on higher-order shear deformation and modified couple stress theories

Mehditabar, Aref; Sadrabadi, S. Ansari; Walker, Jason

doi:10.1080/15397734.2021.1908145

Cited by 8 publications

(4 citation statements)

References 47 publications

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“…Their results indicated that in FG composite conical microshells with higher semi-vertex angles, the effect of material property gradient index on nonlinear critical buckling pressure decreases. Mehditabar et al [16] investigated the thermal buckling of a functionally graded microshell using higher-order shear deformation and modified couple stress theories. They derived governing equations and boundary conditions based on classical higherorder shear deformation theory, considering parameters such as temperature distribution profile, edge boundary conditions, length scale parameter, length-to-radius ratio, and FG power-law index on critical buckling temperature.…”

Section: Introductionmentioning

confidence: 99%

Buckling analysis of sandwich cylindrical micro shells with functionally graded porous core subjected to uniform magneto-electric fields based on couple stress theory

Mohammed

Biglari

Tahami

2023

Preprint

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This study examines the buckling behavior of sandwich cylindrical microshells made of functionally graded materials under uniform magneto-electric load. The analysis utilizes a high-order shear and normal deformation shell theory, incorporating a material length scale parameter from the couple stress theory. Hamilton's principle is used to derive the equations of motion and boundary conditions at both ends. The Navier procedure is employed to determine the dimensionless critical buckling load for three types of functionally graded sandwich cylindrical microshells, with a vector used to represent the uniform magneto-electric fields at both ends. Results indicate that angled functionally graded sandwich cylindrical microshells exhibit higher stiffness in couple stress theory than in normal FGS, resulting in an increased dimensionless critical buckling load. Moreover, the material length scale parameter has a significant impact on the dimensionless critical buckling load across various axial and circumferential wavenumbers. An increase in power-law index n for specific values of dimensionless length scale parameter (l/h) leads to a decrease in DCB load according to MCST.

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Section: Introductionmentioning

confidence: 99%

Buckling analysis of sandwich cylindrical micro shells with functionally graded porous core subjected to uniform magneto-electric fields based on couple stress theory

Mohammed

Biglari

Tahami

2023

Preprint

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“…The development of microtechnology systems has led to the development of various devices such as micro switches, sensors, and resonators. These small devices are often subjected to complex stress and strain states during use, and their mechanical properties have a significant impact on their efficiency 10–13 . Among the first researchers interested in MEMS was Freidhoff 14 who conducted investigations related to microbeam design.…”

Section: Introductionmentioning

confidence: 99%

“…These small devices are often subjected to complex stress and strain states during use, and their mechanical properties have a significant impact on their efficiency. [10][11][12][13] Among the first researchers interested in MEMS was Freidhoff 14 who conducted investigations related to microbeam design. Many researchers have studied the static behavior of microbeams, such as Chu et al 15 who analyzed various properties of microbeam systems exposed to electrostatic forces using the mass and spring model.…”

Section: Introductionmentioning

confidence: 99%

Thermal‐induced Buckling analysis of microbeams with intermediate support under thermal load based on modified couple stress theory

Wang¹

2022

Heat Trans

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This study investigates the buckling of microbeams with variable cross‐sections and middle supports in a thermal environment. Based on classical theories and modified couple stress, the size‐dependent behavior of the microbeam is modeled, and the intermediate support is simulated elastically. A temperature‐dependent relationship will also be assumed for the material properties of the microbeam. The governing equations will be derived using Hamilton's principle based on the modified Couple stress theory and the nonlinear thermal field. Using an analytical approach, buckling loads and deformation of microbeams will be determined. The accuracy of the answers will be investigated to demonstrate the effectiveness of the method used and the correctness of the results obtained. A comparison will be made between the obtained results and the results available in the scientific literature to prove the accuracy of the formulation and the method used. A parametric study will then be conducted to determine the effect of boundary conditions, the flexibility of the middle support, temperature distribution, and geometric characteristics on the buckling loads of microbeams.

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“…Many researchers studied the structural integrity in pressurized pipes with and without defects, analytically [28][29][30][31][32] or using numerical algorithms based on the Finite Element Method (FEM) [33,34]. The primary purpose of this study was to investigate the mechanical behaviour of a steel pipe repaired with a composite sleeve.…”

Section: Introductionmentioning

confidence: 99%

Experimental-Numerical Investigation of a Steel Pipe Repaired with a Composite Sleeve

et al. 2022

Self Cite

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Pressure vessels are subjected to deterioration and damage, which can significantly reduce their strength and loading capabilities. Among several procedures nowadays available to repair damaged steel pipelines, composite-repairing systems have become popular over the past few years to restore the loading capacity of damaged pipelines. This study reports a numerical-experimental investigation performed for a composite-repaired pipeline made of API 5L X60 steel. An experimental burst test was carried out on a 4 m long pipe section, closed by two lateral caps, and tested up to failure by means of high-pressure water. In parallel, the test was numerically replicated through a FEM model of the composite-repaired steel tank, allowing for a cross-comparison of results. It was found that the composite repairing system has almost eliminated both the noteworthy thickness reduction of 80% and the related stress concentrations in the pipe body. These outcomes allow for a better understanding of these repairing procedures in order to drive their subsequent optimization.

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Thermal buckling analysis of a functionally graded microshell based on higher-order shear deformation and modified couple stress theories

Cited by 8 publications

References 47 publications

Buckling analysis of sandwich cylindrical micro shells with functionally graded porous core subjected to uniform magneto-electric fields based on couple stress theory

Buckling analysis of sandwich cylindrical micro shells with functionally graded porous core subjected to uniform magneto-electric fields based on couple stress theory

Thermal‐induced Buckling analysis of microbeams with intermediate support under thermal load based on modified couple stress theory

Experimental-Numerical Investigation of a Steel Pipe Repaired with a Composite Sleeve

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