Presented By: Aerospace Engineering
Chair's Distinguished Lecture Series - Programmable metamaterials for redirecting stress waves on the fly
Osama R. Bilal, ETH Postdoctoral Fellow, California Institute of Technology (Caltech)
Osama R. Bilal, ETH Postdoctoral Fellow, California Institute of Technology (Caltech)
Mechanical metamaterials are material systems with tailored, architected geometry, designed to retain static and dynamic properties that do not exist or rare in nature. This class of materials usually features a structural pattern that repeats spatially (i.e., unit cell). Most of the metamaterials properties are inscribed in the unit cell’s frequency dispersion spectrum, ranging form its stiffness at zero frequency to its wave attenuation capacity at finite frequencies. These metamaterials are well suited to provide new materials-based advances (through geometry rather than chemical composition) to both structural and acoustical engineering of aerospace vehicles and structures. These advances, for example, can range from sound and vibration insulation to flow control. A major challenge in metamaterials design is to engineer unit cells that have the ability to change their mechanical properties in a predetermined manner, within practical time frames. As a demonstration of principle, we harness geometric and magnetic nonlinearities to tune the metamaterials’ dispersion characteristics. We program our nonlinear metamaterial to redirect stress waves, on the fly, in a reversible and element-wise fashion.
About the speaker...
Osama R. Bilal received his Ph.D. in Aerospace Engineering from the University of Colorado Boulder. He is currently a postdoctoral scholar in the Department of Mechanical and Civil Engineering at the California Institute of Technology (Caltech). Before relocating to Caltech, he was an ETH postdoctoral fellow in the department of mechanical engineering in ETH Zurich, Switzerland. His research interest spans the realization of advanced material and structures by design, autonomous deployment of material systems, topology optimization, flow control, and multifunctional metamaterials. Osama is the recipient of several awards, including the ARL postdoctoral fellowship (Army), ETH postdoctoral fellowship (ETH), the Graduate Student Service Award (CU-Boulder), the International Student Award (CU-Boulder), the Outstanding Academic Achievement Award (CU-Boulder) and the Phononics 2011 Fellowship (National Science Foundation), among others. More info at http://www.orbilal.com/
Mechanical metamaterials are material systems with tailored, architected geometry, designed to retain static and dynamic properties that do not exist or rare in nature. This class of materials usually features a structural pattern that repeats spatially (i.e., unit cell). Most of the metamaterials properties are inscribed in the unit cell’s frequency dispersion spectrum, ranging form its stiffness at zero frequency to its wave attenuation capacity at finite frequencies. These metamaterials are well suited to provide new materials-based advances (through geometry rather than chemical composition) to both structural and acoustical engineering of aerospace vehicles and structures. These advances, for example, can range from sound and vibration insulation to flow control. A major challenge in metamaterials design is to engineer unit cells that have the ability to change their mechanical properties in a predetermined manner, within practical time frames. As a demonstration of principle, we harness geometric and magnetic nonlinearities to tune the metamaterials’ dispersion characteristics. We program our nonlinear metamaterial to redirect stress waves, on the fly, in a reversible and element-wise fashion.
About the speaker...
Osama R. Bilal received his Ph.D. in Aerospace Engineering from the University of Colorado Boulder. He is currently a postdoctoral scholar in the Department of Mechanical and Civil Engineering at the California Institute of Technology (Caltech). Before relocating to Caltech, he was an ETH postdoctoral fellow in the department of mechanical engineering in ETH Zurich, Switzerland. His research interest spans the realization of advanced material and structures by design, autonomous deployment of material systems, topology optimization, flow control, and multifunctional metamaterials. Osama is the recipient of several awards, including the ARL postdoctoral fellowship (Army), ETH postdoctoral fellowship (ETH), the Graduate Student Service Award (CU-Boulder), the International Student Award (CU-Boulder), the Outstanding Academic Achievement Award (CU-Boulder) and the Phononics 2011 Fellowship (National Science Foundation), among others. More info at http://www.orbilal.com/
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