On the high temperature mechanical behaviors analysis of heated functionally graded plates using FEM and a new third-order shear deformation plate theory

Published on May 1, 2016in Composites Part B-engineering7.635
· DOI :10.1016/J.COMPOSITESB.2016.02.048
Tinh Quoc Bui54
Estimated H-index: 54
(TITech: Tokyo Institute of Technology),
Thom Van Do11
Estimated H-index: 11
(Le Quy Don Technical University)
+ 6 AuthorsSohichi Hirose15
Estimated H-index: 15
(TITech: Tokyo Institute of Technology)
Abstract Composite functionally graded materials (FGMs) are fabricated and most commonly used to operate in high temperature environments, where are expected to have significant changes in properties of constituent materials. The FGMs inherently withstand high temperature gradients due to low thermal conductivity, core ductility, low thermal expansion coefficient, and many others. It is essential to thoroughly study mechanical responses of FGMs and to develop new effective approaches for accurate prediction of solutions. We present in this paper new numerical results of high temperature mechanical behaviors of heated functionally graded (FG) plates, emphasizing the high temperature effects on static bending deflections and natural frequencies. A displacement-based finite element formulation associated with a novel third-order shear deformation plate theory (TSDT) without any requirement of shear correction factors is thus developed, taking the desirable properties and advantages of the TSDT theory as its kinematics of displacements are derived from elasticity theory rather than the hypothesis of displacement. The FG plates are assumed to be placed suffering high temperature environment, resulting in a uniform distribution of temperature across the plate thickness. The variation of material compositions across the thickness is described by a power-law distribution. Representative numerical examples of heated FG plates with different shapes are considered and obtained results are then investigated. The work additionally involves parametric studies performed by varying volume fraction, temperature range, material combinations, thickness-to-length ratio, etc., which have significant impacts on mechanical deflections and natural frequencies of heated FG plates. It is found that the ZrO 2 /SUS304 plate possesses different static bending behaviors and performance compared to Al 2 O 3 /SUS304 and Si 3 N 4 /SUS304 plates due to the differences not only in the nonlinear thermal expansions but also in the material behaviors of constituent materials. In the contrary similar behaviors of natural frequencies of all FG plates is found.
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