In-plane asymmetric buckling of an FGM circular arch subjected to thermal and pressure fields. (15th July 2021)

• Record Type: Journal Article
• Authors: Tang, Yan; Tang, Fujian; Zheng, Junxing; Li, Zhaochao
• Is Part Of: Engineering structures. Volume 239(2021)
• Publication Date: 2021-07-15
• Subjects: Static stability -- FGM -- Circular arch -- Pressure field -- Thermal field -- Power-law index; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.112268
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlight: The material property is distributed non-symmetrically through the cross-section. The FGM arch shows different stability performance from the homogeneous arch. The temperature rise has an evident effect on the mechanical behavior of the FGM arch. Numerical verification agrees well with the derived analytical predictions. Parametric studies are conducted comprehensively. Abstract: Several recent applications, i.e. space-structures and fusion reactors, involve the adoption of functionally graded materials (FGM) in their basic elements, such as the thin-walled cylinders, arches, beams, plates, and so on. These elements may be under a temperature variational environment due to the season's change, day and night temperature variation, or even fire disasters. The load capacity and/or buckling behavior of these thin-walled structures may be different from the ones only under mechanical loadings. Based on this fact, this study refers to the in-plane asymmetric buckling of the heated circular FGM arches under uniform pressure fields. The material of the FGM arch is thermo-elastic. A thermal radially-outward deflection occurs before the pressure field is introduced. This deflection may result in different buckling mechanisms from the arch under pure pressure loading. Analytical predictions on the buckling pressure are derived by combining the thin-walled shell schemes, admissible displacement functions, and the energy theory. Subsequently, a finite element simulation is introduced to trace the kinematic movement of the crown point. The pressure-displacement plots are obtained, from which, the buckling pressure is reachable. It is found the thermal field affects considerably the static stability of the FGM arch. Finally, a discussion refers mainly to the influence of material inhomogeneity on the buckling pressure, especially focusing on the influence of different power-law indexes on the internal forces, stresses, and strains.