About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Porous Materials for Energy and Environment Applications
|
| Presentation Title |
Beyond Ideal Strength Scaling in Ceramic Architected Materials Subjected to Hydrostatic Loads |
| Author(s) |
Fakhreddin Emami, Andrew Gross |
| On-Site Speaker (Planned) |
Fakhreddin Emami |
| Abstract Scope |
Architected materials use engineered porous structures to achieve tailored effective properties that differ from those of the parent material. Ideally, they exhibit a linear relationship between relative density and mechanical properties. Ceramic materials exhibit a pressure sensitive shear failure stress. Recognizing this behavior enables a new theoretical limit to be established for beam based ceramic architected materials by considering when the linear shear--pressure relationship for uniaxial loading intersects the nonlinear Mohr-Coulomb failure envelope of a ceramic parent material. This presents an unprecedented opportunity to achieve better than linear strength scaling in porous materials. Considering this new theoretical limit and the other failure modes of beam lattice materials, an optimization is conducted on Kelvin cell foams with relative densities in the range of 0.65%-2.0% subjected to hydrostatic compression. The optimized designs approach the newly proposed theoretical limit, with a strength more than six times higher than the traditional theory predicts. |