Dynamic buckling analysis evaluates instability that occurs when a structure is subjected to time-varying compressive loading, often expressed as a parametric resonance problem.
How It Works
The thesis frames the dynamic load as an axial compressive load with static and harmonic components. The finite element model supplies stiffness, geometric stiffness, and mass matrices. Vibration and buckling eigenvalue analyses are then used to determine natural frequencies, critical buckling loads, and the excitation/load combinations that form instability boundaries.
Why It Matters
Thin shell structures can be vulnerable to buckling and vibration. For vehicles exposed to large dynamic axial loads, such as high-speed aircraft, missiles, launch vehicles, re-entry vehicles, or supercavitating underwater vehicles, static buckling checks alone can miss instability regions caused by dynamic loading.
Validation Thread
The source validates dynamic buckling against beam theory, then compares plate and stiffened plate instability regions with experimental trends. The beam example reports a natural frequency of 10.7 Hz and a critical buckling load of 71.73 N, while the plate example reports a natural frequency of 5.17 Hz and a critical buckling load of 49.6 N.
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