Feasibility Study of Test Problems for Finite Element/Finite Difference Programs for Structural Dynamics.
Final technical rept. 1 Aug 85-31 Jan 86,
BROWN UNIV PROVIDENCE RI
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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 beamhalf 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.
- Structural Engineering and Building Technology