Research Papers

A Nonclassical Model for Circular Mindlin Plates Based on a Modified Couple Stress Theory

[+] Author and Article Information
S.-S. Zhou

Mechanical Engineer
Houston Technology Center,
Baker Hughes Inc.,
Houston, TX 77073

X.-L. Gao

ASME Fellow
Department of Mechanical Engineering,
University of Texas at Dallas,
800 West Campbell Road,
Richardson, TX 75080
e-mail: Xin-Lin.Gao@utdallas.edu

1Corresponding author.

Manuscript received November 4, 2013; final manuscript received December 13, 2013; accepted manuscript posted December 19, 2013; published online January 10, 2014. Assoc. Editor: Pradeep Sharma.

J. Appl. Mech 81(5), 051014 (Jan 10, 2014) (8 pages) Paper No: JAM-13-1454; doi: 10.1115/1.4026274 History: Received November 04, 2013; Revised December 13, 2013

A nonclassical model for circular Mindlin plates subjected to axisymmetric loading is developed using a modified couple stress theory. The equations of motion and boundary conditions are simultaneously obtained through a variational formulation based on Hamilton's principle. The new model contains a material length scale parameter and can capture the size effect, unlike existing circular Mindlin plate models based on classical elasticity. In addition, both the stretching and bending of the plate are considered in the formulation. The current plate model reduces to the classical elasticity-based Mindlin plate model when the material length scale parameter is set to be zero. Additionally, the new circular Mindlin plate model recovers the circular Kirchhoff plate model as a special case. To illustrate the new model, the static bending problem of a clamped solid circular Mindlin plate subjected to an axisymmetrically distributed normal pressure is analytically solved by directly applying the new model and using the Fourier–Bessel series. The numerical results show that the deflection and rotation angle predicted by the new model are smaller than those predicted by the classical Mindlin plate model. It is further seen that the differences between the two sets of predicted values are significantly large when the plate thickness is small, but they are diminishing with the increase of the plate thickness.

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Grahic Jump Location
Fig. 2

Deflection of the clamped circular Mindlin plate

Grahic Jump Location
Fig. 3

Rotation angle of the clamped circular Mindlin plate




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