Abstract
Experiments, modeling, and simulation were used to study the nonlinear dynamics of a jointed structure in a shock tube. The structure was a full-span square cylinder with internal bolted connections excited by fluid loading. The Reynolds number based on width was . The cylinder was exposed to an impulsive force associated with the incident shock followed by transverse loading imposed by vortex shedding. Experimentally, aerodynamic loading was characterized with high-speed pressure sensitive paint (PSP). Digital image correlation concurrently measured the structural response. Maximum displacement occurred when the vortex shedding frequency most closely matched the structural mode of the beam associated with a rocking motion at the joint. A finite element model was developed using Abaqus, where Coulomb friction modeled the nonlinear contact in the joint. The PSP data supplied the input load to the model as a one-way-coupled interaction. The simulations matched well the trends observed in the experiment. Overall, the root-mean-square values of the transverse displacement agreed to within 24% of the experiment. The modeling showed rocking about the joint during vortex shedding was critical to the nonlinear damping and energy dissipation observed in the structure. This highlights the importance of jointed connections to energy dissipation in structures under aerodynamic loading.
Published Version
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