Hygrothermal environment effect on the critical buckling load of FGP microbeams with initial curvature integrated by CNT-reinforced skins considering the influence of thickness stretching

Abstract Due to the need for structures with refined properties bear against different loading conditions, recently, carbon nanotubes (CNTs) have been used widely reinforce them. The extremely high stiffness of CNTs makes them significant as one best reinforcements improve mechanical behaviors structures. This work focuses on microbeam buckling response an initial curvature that includes three layers. mid-layer is known core constituted functionally graded porous (FGP) materials and two CNT-reinforced composite skins are bonded integrate it. whole structure affected by hygrothermal environment springs shear layers put below For first time, such a structure, deformation theory (RSDT) higher-order considers thickness stretching effect in polar coordinates presents more accurate results, especially deeply curved beams. Modified couple stress (MCST) combination virtual displacement principle utilized establish governing equations. obtained results demonstrate significance porosity percentage CNTs’ addition critical load. Also, microstructure at various temperatures analyzed discussed detail.