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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Structural Metamaterials
Presentation Title Controlling Failure with Fractal Chiral Metamaterials
Author(s) Fabrizio Scarpa, Wenjiao Zhang, Robin Neville, Dayi Zhang
On-Site Speaker (Planned) Fabrizio Scarpa
Abstract Scope 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.
Proceedings Inclusion? Planned:
Keywords Shaping and Forming, Mechanical Properties, Modeling and Simulation

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A Comparison of Energy Absorption Behavior of Additively Manufactured AlSi10Mg Honeycomb, Lattice and TPMS Cellular Structures under Quasistatic Compression
Architectured Bioinspired Alumina with a Metallic Nickel Compliant-phase
Bioinspired Hierarchical Architected Structures Via Additive Manufacturing
Combined Effects of Heterogeneity and Length-scale on Mechanical Properties of Lattice Metamaterials
Controlling Failure with Fractal Chiral Metamaterials
Design of 2D-Mechanical Metamaterials with Spinodal Topologies
Engineering Splat Based Features for Improved Damage Tolerance in Brittle Metamaterials
Exceptional Mechanical Properties of Additively Manufactured Nano-architected Materials with Complex Topologies
Flexibly Tunable Yet Strong Gear-based Mechanical Metamaterials
G-32: Coated Nano- and Micro-lattices via Magnetron Sputtering
G-33: Gaussian Process Regression as a Surrogate Model for the Computation of Dispersion Relations
High-stiffness Metamaterial Composite Structure with Plate Reinforced Strut-microlattice
Interpenetrating Chain Lattices with Tailorable Energy Absorption in Tension
Investigation on Mechanical Properties of Honeycomb-based Cellular Solids and Cylindrical Shells with Structural Hierarchy
Large-strain Compressive Response and Failure Mechanisms of Additively Manufactured Cubic Chiral Lattices
Machine Learning Design of Dynamic/Impact Behaviors
Machine Learning of Symbolic Expressions to Model Dispersion Curves in Metamaterials
Phase Field Modeling of Crack Propagation, Deflection and Delamination in Engineered Interfaces
Seeing Beneath the Surface: Estimating Interior Material Properties with Visual Vibration Tomography
Sensitivity and Uncertainty Quantification Analysis in Phononic Metamaterials through Complex-Variable Finite Element Method
Single Test Evaluation and Design of Directional Elastic Properties in Anisotropic Materials
Structural Locking in Multimodal Origami Metamaterials
Topological States and Bandgaps in Dimerized Minimal Surfaces
Viscoelastic Dynamics of Polymeric Phononic Materials

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