|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Design for Mechanical Behavior of Architectured Materials via Topology Optimization
||Designing Metamaterials for
Enhanced Noise and Vibration Properties
||Lise Noel, Claus Claeys, Elke Deckers, Wim Desmet
|On-Site Speaker (Planned)
To satisfy industrial requirements, lightweight materials are extremely popular. However, their good mechanical properties are often associated with poor noise and vibration performance. Locally resonant metamaterials were recently developed to combine enhanced mechanical and vibro-acoustic properties.
In metamaterials, bandgaps, i.e. frequency ranges with no free wave propagation, are created by including resonant additions on a subwavelength scale. Metamaterials present several advantages. First, bandgaps do not rely on periodicity. Furthermore, low frequencies can be attenuated resorting to light and compact resonators, about two orders of magnitude smaller than the wavelength attenuated. So far, the fine-tuning of metamaterials remains largely based on the designers experience.
Density-based topology optimization is exploited to tackle the automatic design of perforated plates exhibiting bandgaps. Assuming periodicity, dispersion properties can be predicted through unit cell modeling and the application of Bloch-Floquet boundary conditions. Specific constraints are imposed to trigger local resonance.
||Planned: Supplemental Proceedings volume