FURTHER ENHANCEMENT OF FREQUENCY RESPONSE AND DAMPING ANALYSIS CAPABILITIES OF THE VAST FINITE ELEMENT CODE (PHASE III). PART 1: DEVELOPMENT OF HIGHER ORDER SHELL ELEMENTS

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Authors
  1. Jiang, L.
  2. Chernuka, M.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
The report provides details on the theoretical background and computer implementation of two multilayered shell elements in the VAST finite element program. These shell elements were developed using the single-layer and layerwise higher-order shear deformation theories, respectively. The theoretical derivation can also be viewed as a generalization of the concept of degenerated three-dimensional solid elements with the resulting shell elements being able tohandle doubly-curved geometry. In the current implementation of these higher-order shell elements, linear static, natural frequency and frequency response analysis capabilities have been incorporated. In order to model visoelastically damped structures, options for calculating strain energy ratios (SER) and systems loss factors were also provided. Extensive numerical experimentation, involving multilayered beams, plates and a ring, has been conducted for verification purposes and the VAST predictions were in very good agreement with published experimental, theoretical and numerical solutions. The numerical results indicated that for damping characterization, the layerwise higher-order shell element is more effective than the one based on the single-layer higher-order theory.
Keywords
Structural acoustics;Damping Loss factor;Constrained Layer Damping
Report Number
DREA-CR-97-406;TR-96-28 — Contractor Report
Date of publication
01 Dec 1996
Number of Pages
105
DSTKIM No
97-03299
CANDIS No
503242
Format(s):
Hardcopy;Document Image stored on Optical Disk

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