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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

191
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
191

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Origami Metamaterials Enable Low-Stress-Driven Giant Elastocaloric Effect.

Jun Cai1, Bin Yang1, Abdolhamid Akbarzadeh1,2

  • 1Department of Bioresource Engineering, McGill University, Montreal, Québec H9X 3V9, Canada.

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Origami engineering creates advanced elastocaloric metamaterials. These materials offer giant, hysteresis-free cooling effects across wide temperature ranges, paving the way for next-generation thermal management.

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3D printingElastocaloric effectElastocaloric strengthGraphene origamiMolecular dynamics simulationMultifunctional metamaterials

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Nanotechnology

Background:

  • Elastocaloric materials offer eco-friendly cooling but face limitations like hysteresis and narrow operating temperatures.
  • Existing materials often rely on phase transitions, restricting their performance and applicability.

Purpose of the Study:

  • To explore origami engineering for developing multifunctional elastocaloric metamaterials.
  • To achieve enhanced elastocaloric effects at both nano and meso scales.
  • To overcome limitations of conventional elastocaloric materials.

Main Methods:

  • Computational simulations of graphene origami at the nanoscale.
  • Experimental investigation of thermoplastic polyurethane elastomers at the mesoscale.
  • 3D printing of mesoscale origami-inspired metastructures.

Main Results:

  • Graphene origami demonstrated giant, reversible elastocaloric effects with no hysteresis and high strength.
  • Effects were observed across a broad temperature range (100-600 K) and are tunable.
  • 3D-printed polyurethane metastructures showed enhanced room-temperature elastocaloric performance.

Conclusions:

  • Origami engineering enables the design of architected elastocaloric materials with superior performance.
  • These metamaterials offer a promising pathway for multiscale, sustainable thermal management solutions.
  • The study highlights the potential of surface functionalization and origami principles in this field.