Bioinspired conductive cellulose liquid-crystal hydrogels ...
BIOINSPIRED DESIGN - University of California, San...
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0 1 2 3 0 0.05 0.1 Stress (MPa) Strain (mm/mm) 0 2 4 6 8 0 15 30 45 60 75 90 Modulus of rigidity (GPa) Spiral reinforcement angle (deg.) Applied load Ice growth Applied load Ice growth BIOINSPIRED DESIGN “Nature is the ultimate experimental scientist, having billions of years of evolution to design, test, and adapt a multitude of complex materials and organisms” Michael M Porter*, Marc A Meyers, Joanna McKittrick Materials Science and Engineering Program Department of Mechanical and Aerospace Engineering University of California, San Diego Magnetic Freeze Casting What is freeze casting? A materials processing method to form bioinspired materials that mimic the microstructures and mechanical performance of natural materials, such as wood, bone, and abalone nacre. Why add magnetic fields? Magnetic fields allow for the manipulation of magnetic particles during ice growth (out of page) to control the microstructural alignment of freeze cast materials in multiple directions. Why study seahorses? The seahorse tail is composed of a bony-plated armor arranged in articulating ring-like segments that interlock to facilitate bending and twisting, while overlapping to protect against crushing. Inspired by this unique design, a flexible robot is developed from hard, 3D printed plates and soft, polymer actuators (mimicking the bony armor and musculature of a seahorse tail). Seahorse Inspired Robotics Enhanced Compressive Properties MIX FREEZE DRY SINTER HYBRID COMPOSITES POROUS CERAMICS Infiltrate polymers No Magnetic Alignment Mineral Bridge Alignment Lamellar Wall Alignment Spiral Reinforcement 100 μm 100 μm 100 μm 5 mm Rotating Magnetic Field Magnetic Field No Magnetic Field Epoxy 2 x Strength & Stiffness 3 x Torsional Rigidity Enhanced Torsional Rigidity Potential Applications: Bone implants, lightweight armor, separation filters, insulators, catalyst supports, fuel cells, piezoelectric devices, and structural materials for automotive and aerospace... Magnetic Field Magnetic Field No Magnetic Field Potential Applications: Medical – flexible prostheses, controllable catheters, robotically-assisted surgical instruments... Military – flexible armor, surveillance/inspection, armored gripping devices for bomb disposal... How are seahorse-inspired robots better than others? Traditional robots have rigid joints that restrict complex motions, while similar robots inspired by snakes, starfish, octopi, elephants, etc. are composed of hard materials that limit flexibility or soft materials susceptible to failure. This hybrid (hard-soft) design protects the robot, while allowing it to bend, twist, compress, extend, squeeze and expand in multiple directions. NATURAL 3D PRINTING SEAHORSE SKELETON ARTIFICIAL Bony plates CAD models 3D printed plates SEGMENT ASSEMBLY Overlapping Plates Interlocking Segments Elastic Connections Ball-and-Socket Joints What’s next? Insert dielectric elastomers and develop control systems to power the robot and navigate motion. ROBOT SKELETON BENDING TWISTING Ice growth Narwhal tusk
Transcript of BIOINSPIRED DESIGN - University of California, San...
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BIOINSPIRED DESIGN
“Nature is the ultimate experimental scientist, having billions of years of evolution to design, test, and adapt a multitude of complex materials and organisms”
Michael M Porter*, Marc A Meyers, Joanna McKittrick
Materials Science and Engineering Program Department of Mechanical and Aerospace Engineering
University of California, San Diego
Magnetic Freeze Casting What is freeze casting? A materials processing method to form bioinspired materials that mimic the microstructures and mechanical performance of natural materials, such as wood, bone, and abalone nacre.
Why add magnetic fields? Magnetic fields allow for the manipulation of magnetic particles during ice growth (out of page) to control the microstructural alignment of freeze cast materials in multiple directions.
Why study seahorses? The seahorse tail is composed of a bony-plated armor arranged in articulating ring-like segments that interlock to facilitate bending and twisting, while overlapping to protect against crushing. Inspired by this unique design, a flexible robot is developed from hard, 3D printed plates and soft, polymer actuators (mimicking the bony armor and musculature of a seahorse tail).
Seahorse Inspired Robotics
Enhanced Compressive Properties
MIX FREEZE DRY SINTER HYBRID COMPOSITES POROUS CERAMICS
Infiltrate
polymers
No Magnetic Alignment Mineral Bridge Alignment Lamellar Wall Alignment Spiral Reinforcement
100 μm 100 μm 100 μm 5 mm
Rotating Magnetic Field
Magnetic Field
No Magnetic Field Epoxy
2 x Strength & Stiffness
3 x Torsional Rigidity
Enhanced Torsional Rigidity
Potential Applications: Bone implants, lightweight armor, separation filters, insulators, catalyst supports, fuel cells, piezoelectric devices, and structural materials for automotive and aerospace...
Magnetic Field Magnetic Field No Magnetic Field
Potential Applications: Medical – flexible prostheses, controllable catheters, robotically-assisted surgical instruments... Military – flexible armor, surveillance/inspection, armored gripping devices for bomb disposal...
How are seahorse-inspired robots better than others? Traditional robots have rigid joints that restrict complex motions, while similar robots inspired by snakes, starfish, octopi, elephants, etc. are composed of hard materials that limit flexibility or soft materials susceptible to failure. This hybrid (hard-soft) design protects the robot, while allowing it to bend, twist, compress, extend, squeeze and expand in multiple directions.
NATURAL 3D PRINTING
SEAHORSE SKELETON
ARTIFICIAL
Bony plates CAD models
3D printed plates
SEGMENT ASSEMBLY
Overlapping Plates
Interlocking Segments
Elastic Connections
Ball-and-Socket Joints
What’s next? Insert dielectric elastomers and develop control systems to power the robot and navigate motion.
ROBOT SKELETON
BENDING
TWISTING
Ice growth
Narwhal tusk
