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Unformatted text preview: .000 f2 , Hz 105.32 105.22 0.999 f3 , Hz Static ANSYS 249.39 248.87 0.998 28.766 28.767 1.000 Deflection, in
Stress , psi Modal F = 40,000 lb F = 0 lb
f1 , Hz [see
VM50] 1–140 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. VM60: Natural Frequency of a Cross-ply Laminated Shell
Reference: J. N. Reddy, “Exact Solutions of Moderately Thick Laminated Shells”, ASCE
Journal Engineering Mechanics, Vol. 110 No. 5, 1972, pg. 806, tab. 6. Analysis Type(s): Mode-frequency Analysis (ANTYPE = 2) Element Type(s): Linear Layered Structural Shell Elements (SHELL99) Input Listing: vm60.dat Test Case
Determine the first mode natural frequency f of a simply-supported equal-sided sector of a spherical shell of radius r. The shell sector consists of a 0°/90° cross-ply laminate (2 layers of equal thickness, t). Figure 60.1 Laminated Spherical Shell Problem Sketch Material Properties
ρ = 1 gm/mm3
Ex = 25 x 106 Pa
Ey = 1 x 106 Pa Geometric Properties
r = 300 mm
a = 100 mm
t = 0.5 mm Gxy = Gxz = 5 x 105 Pa
Gyz = 2 x 105 Pa
υyx = .25 (major Poisson's ratio) Analysis Assumptions and Modeling Notes
Four elements are chosen along each edge of area 1. The reduced method of eigenvalue solutio...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.
- Spring '09
- The Land