Feasibility Study of Test Problems for Finite Element/Finite Difference Programs for Structural Dynamics.

Abstract

This research has resulted in additional calculations which will provide essential guides to future work. Using the Shanley model as a cheap and effective tool, calculated results show the influence of the geometrical parameter eta (= thickness of sandwich beam/half span) and of damping. It is seen that the anomalous behavior occurs only in a small range of thickness. Damping changes the response behavior fundamentally: counter-intuitive behavior still occurs but in a much more irregular manner, suggestive of chaotic behavior. Calculations using ABAQUS for the pinned uniform beam of 'standard' dimensions and for a 'test specimen' of slightly different dimensions show the characteristic diagrams for the two cases. It is surprising that qualitatively different shapes are obtained for the critical range of loads. The anomalous behavior being studied is evidently sensitive to parameters in unexpected ways. Keywords: Structural response; Plastic flow; Dynamic instabilities; Flexural stress.

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Document Details

Document Type
Technical Report
Publication Date
Mar 12, 1986
Accession Number
ADA169058

Entities

People

  • H. Kolsky
  • P. S. Symonds

Organizations

  • Brown University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Guns
  • Applied Mathematics
  • Classification
  • Contracts
  • Determinants (Mathematics)
  • Dynamics
  • Engineering
  • Feasibility Studies
  • Geometry
  • Mathematics
  • Military Research
  • Plastic Flow
  • Security
  • Standards
  • Thickness
  • Universities
  • Vibration

Fields of Study

  • Engineering

Readers

  • Mathematics or Statistics
  • Structural Dynamics.
  • Systems Analysis and Design