Size-dependent behaviour of functionally graded sandwich microbeams based on the modified couple stress theory

Thai, Huu-Tai, Vo, Thuc, Nguyen, Trung-Kien and Lee, Jaehong (2015) Size-dependent behaviour of functionally graded sandwich microbeams based on the modified couple stress theory. Composite Structures, 123. pp. 337-349. ISSN 0263-8223

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Abstract Static bending, buckling and free vibration behaviours of size-dependent functionally graded (FG) sandwich microbeams are examined in this paper based on the modified couple stress theory and Timoshenko beam theory. To avoid the use of a shear correction factor, equilibrium equations were used to compute the transverse shear force and shear stress. Two types of sandwich beams were considered: (1) homogeneous core and FG skins and (2) FG core and homogeneous skins. Numerical results were presented to illustrate the small scale effects on the behaviours of FG sandwich beams. The results reveals that the inclusion of the size effects results in an increase in the beam stiffness, and consequently, leads to a reduction of deflections and stresses and an increase in natural frequencies and critical buckling loads. Such effects are more pronounced when the beam depth was small, but they become negligible with the increase of the beam depth.

Item Type: Article
Additional Information: Available online 4-12-2014 ahead of print
Uncontrolled Keywords: Functionally graded sandwich beam; Modified couple stress theory; Small scale effect; Timoshenko beam
Subjects: H200 Civil Engineering
H300 Mechanical Engineering
H400 Aerospace Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Thuc Vo
Date Deposited: 11 Dec 2014 14:10
Last Modified: 17 May 2017 04:30

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