|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Controlling Failure with Fractal Chiral Metamaterials
||Fabrizio Scarpa, Wenjiao Zhang, Robin Neville, Dayi Zhang
|On-Site Speaker (Planned)
Metamaterials with fractal and perforated periodic patterns feature dramatic changes of static and dynamic properties that depend on the fractal order of the periodic pattern characteristic of their unit cells. The failure characteristics of those metamaterials have been seldom explored. We present experimental and numerical results related to the tensile and shear failure of fractal chiral metamaterial perforated plates with up to 3 fractal orders. The fractal metamaterials have been built by laser cutting techniques over PMMA substrates. Analytical, full scale and periodic unit cells Finite Element models have been also developed. These metamaterials show interactions between their fractal architecture and friction-induced dissipative mechanisms when components of the fractal pattern enter in contact during loading. Both experiments and models show that failure stresses exhibit a linear logarithmic scale dependence versus the fractal order of the pattern; crack propagation is also dependent upon the fractal design of the unit.
||Shaping and Forming, Mechanical Properties, Modeling and Simulation