Cellular Solids: Structure, Properties and Applications free videos and free material uploaded by Massachusetts Institute of Technology Staff .
Introduction
- Examples, images
- Overview of properties: Density, mechanical, thermal
- Examples of applications
- Selection of cellular materials in engineering design
Structure
- Relative density, open vs closed cells, anisotropy
- Topological laws: Euler, Aboav-Weaire
Processing
- Honeycombs
- Foams
- Lattice materials
Mechanics of honeycombs
- Stress strain behavior; mechanisms of deformation
- Linear elasticity: Beam bending
- Compressive collapse stress: Column buckling, plastic hinges, modulus of rupture
- Fracture
- Application of models to natural honeycombs: wood, cork
Mechanics and thermal properties of foams
- Stress strain behavior; mechanisms of deformation; dimensional analysis
- Linear elasticity
- Compressive collapse stress
- Densification
- Fracture
- Microstructural design, lattice materials and property charts
- Thermal properties
- Nanofoams (guest lecture, Prof. Demkowicz)
Trabecular bone and osteoporosis
- Structure of trabecular bone
- Application of foam models to trabecular bone
- Modelling of bone loss in osteoporosis
Tissue engineering scaffolds
- Processing and properties
- Application of foam models to tissue engineering scaffolds
- Case study: Osteochondral scaffold
- Cell-scaffold interactions: cell adhesion, contraction, migration in scaffolds
Applications: Energy absorption devices
- Energy absorption devices: bicycle helmet case study; fluid-filled foams
Applications: Structural sandwich panels
- Stresses in sandwich panels; analogy with I beams
- Minimum weight design of sandwich panels
- Case study: Downhill skis
- Sandwich structures in nature: monocotyledon leaves, skulls, shells
Mechanically efficient cellular structures in plants
- Radial density gradient structures (palm stems, bamboo culms)
- Cylindrical shells with compliant cores (grass stems, animal quills)
- Hierarchical structure and mechanics of plants
This course reviews the processing and structure of cellular materials as they are created from polymers, metals, ceramics, glasses, and composites, develops models for the mechanical behavior of cellular solids, and shows how the unique properties of honeycombs and foams are exploited in applications such as lightweight structural panels, energy absorption devices and thermal insulation. The applications of cellular solids in medicine include increased fracture risk due to trabecular bone loss in patients with osteoporosis, the development of metal foam coatings for orthopaedic implants, and designing porous scaffolds for tissue engineering that mimic the extracellular matrix. Modelling of cellular materials applied to natural materials and biomimicking is explored. Students taking the graduate version of the class are required to complete additional assignments.
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