Journal
SMART STRUCTURES AND SYSTEMS
Volume 19, Issue 3, Pages 309-322Publisher
TECHNO-PRESS
DOI: 10.12989/sss.2017.19.3.309
Keywords
buckling, and free vibration analysis; FG-CNTRC micro-composite Reddy beam; various distribution patterns of CNTs; Strain gradient theory; longitudinal magnetic field; FEM
Funding
- Iranian Nanotechnology Development Committee [463855/3]
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In this paper, the buckling, and free vibration analysis of tapered functionally graded carbon nanotube reinforced composite (FG-CNTRC) micro Reddy beam under longitudinal magnetic field using finite element method (FEM) is investigated. It is noted that the material properties of matrix is considered as Poly methyl methacrylate (PMMA). Using Hamilton's principle, the governing equations of motion are derived by applying a modified strain gradient theory and the rule of mixture approach for micro-composite beam. Micro-composite beam are subjected to longitudinal magnetic field. Then, using the FEM, the critical buckling load, and natural frequency of micro-composite Reddy beam is solved. Also, the influences of various parameters including a and (the constant coefficients to control the thickness), three material length scale parameters, aspect ratio, different boundary conditions, and various distributions of CNT such as uniform distribution (UD), unsymmetrical functionally graded distribution of CNT (USFG) and symmetrically linear distribution of CNT (SFG) on the critical buckling load and non-dimensional natural frequency are obtained. It can be seen that the non-dimensional natural frequency and critical buckling load decreases with increasing of for UD, USFG and SFG micro-composite beam and vice versa for a. Also, it is shown that at the specified value of a and beta, the dimensionless natural frequency and critical buckling load for SGT beam is more than for the other state. Moreover, it can be observed from the results that employing magnetic field in longitudinal direction of the micro-composite beam increases the natural frequency and critical buckling load. On the other hands, by increasing the imposed magnetic field significantly increases the stability of the system that can behave as an actuator.
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