Resonance in Polyurea-Based Multilayer Structures Subjected to Laser-Generated Stress Waves
Source abstract
Abstract
We report resonance associated with polyurea layers sandwiched between identical acrylic and polycar- bonate plates when subjected to laser-generated stress waves of several nanoseconds in duration. Transmitted stress wave amplitudes almost 16 times the incident stress wave ampli- tudes are observed. An elastodynamics simulation identified the thickness of the polyurea layer as the key parameter controlling the amplitude of the transmitted stress wave. This resonance effect was found absent when the polyurea was sandwiched between the steel and aluminum plates of similar thickness. However, for these samples, a dramatic reduction in the amplitudes of the transmitted stress waves was recorded. A finite element analysis of the wave propa- gation through the sandwiched polyurea layer in these sam- ples tied the large amplitude reduction to the large acoustic impedance mismatch and the viscoelastic dissipation within the polyurea layer.
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Research context
OpenAlex topics: Structural Response to Dynamic Loads · Fire effects on concrete materials · Building materials and conservation
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