A5026158058- Cellular and Composite Structures
- Advanced Materials and Mechanics
- Polymer composites and self-healing
- Nonlocal and gradient elasticity in micro/nano structures
- Elasticity and Material Modeling
- Nanoporous metals and alloys
- Brake Systems and Friction Analysis
- Mechanical stress and fatigue analysis
- Composite Structure Analysis and Optimization
- Manufacturing Process and Optimization
- Powder Metallurgy Techniques and Materials
- Supramolecular Self-Assembly in Materials
- Structural Analysis and Optimization
- Additive Manufacturing and 3D Printing Technologies
- Material Properties and Applications
- Topology Optimization in Engineering
- Anodic Oxide Films and Nanostructures
- Fluid Dynamics Simulations and Interactions
- Acoustic Wave Phenomena Research
Virginia Tech
2020-2023
University of Wisconsin–Madison
2015-2019
Designing and printing metamaterials with customizable architectures enables the realization of unprecedented mechanical behaviors that transcend those their constituent materials. These are recorded in form response curves, stress-strain curves describing quasi-static footprint. However, existing inverse design approaches yet matured to capture full desired due challenges stemmed from multiple objectives, nonlinear behavior, process-dependent manufacturing errors. Here, we report a rapid...
Chiral three-dimensional cubic lattices are developed with rigid cubical nodules and analyzed via finite element analysis. The exhibit geometry dependent Poisson's ratio that can be tuned to negative values. tends zero as the cubes become further apart. stretch–twist coupling. Such coupling cannot occur in a classical elastic continuum but it chiral Cosserat solid.
Abstract Chiral three‐dimensional isotropic cubic lattices with rigid cubical nodules and multiple deformable ribs are developed analyzed via finite element analysis. The exhibit geometry‐dependent Poisson's ratio that can be tuned to negative values. decreases from positive values as the number of cells increases. Isotropy is obtained by adjustment aspect ratio. significant size effects. Such a phenomenon cannot occur in classical elastic continuum but it Cosserat solid.
Abstract Lattices of controlled thermal expansion are presented based on planar chiral lattice structure with Poisson's ratio approaching . Thermal values can be arbitrarily large positive or negative. A was fabricated from bimetallic strips and the properties analyzed studied experimentally. The effective coefficient is about K This much larger in magnitude than that constituent metals. Nodes were observed to rotate as temperature changed corresponding a Cosserat thermoelastic solid.
A chiral 3D lattice is designed, made by printing, and studied experimentally. The exhibits squeeze–twist coupling a Poisson's ratio near zero. Squeeze–twist does not occur in classical elasticity which makes no provision for chirality. By contrast, effects are allowed Cosserat elasticity. An experimental strain on the order of unity zero reasonable agreement with prior finite element analysis similar structure, negative anticipated sufficient number cells.
A 3D lattice structure consisting of pivoting cubes with flexible links at the corners is presented. It exhibits anisotropic negative Poisson's ratio −0.54 and −0.75. Size effects occur in torsion bending; these are consistent Cosserat elasticity but not classical elasticity. elastic solids exhibit sensitivity to strain gradients; size also reduction stress concentrations. The observed reveal anisotropy.
Cubic+octet plate-lattices, whose unit cell comprises plates aligned along simple-cubic and face-centered-cubic planes of crystal structures, have attracted scientists engineers because their isotropic, near-optimal mass-specific performance that reaches theoretical upper bounds on stiffness strength at low density. While structural efficiency has been recently examined analytically, numerically experimentally, sensitivity to geometric imperfections remained elusive. Here, using finite...