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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Solid-state thermal rectification of bilayers by asymmetric elastic modulus.

Junbyeong Lee1, Seokjae Cha1, Byung Ho Lee2

  • 1School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea. mkkim1212@skku.

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|February 14, 2023
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This summary is machine-generated.

Researchers developed a 33% efficient thermal rectifier using silver-graphene oxide. This device, scalable for large panels, directs heat flow from harder to softer materials, paving the way for industrial applications.

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Area of Science:

  • Materials Science
  • Thermal Physics

Background:

  • Developing efficient thermal rectification for large-scale applications remains a challenge.
  • Thermal rectifiers control heat flow direction, crucial for thermal management.

Purpose of the Study:

  • To experimentally achieve high thermal rectification efficiency in a centimeter-scale system.
  • To investigate the mechanism behind thermal rectification in bilayered materials.

Main Methods:

  • Fabrication of a bilayered silver-graphene oxide sponge with engineered elastic modulus asymmetry.
  • Experimental measurement of thermal rectification efficiency.
  • Finite element analysis to explore contributing mechanisms.

Main Results:

  • Achieved a high thermal rectification efficiency of 33%.
  • Demonstrated that forward heat flow is from the harder to the softer material (e.g., silver to graphene oxide).
  • Observed a reversal of heat flow direction when silver was on polystyrene foam, consistent with elastic modulus asymmetry.

Conclusions:

  • Elastic modulus asymmetry is a key mechanism for high thermal rectification, potentially explained by the Frenkel-Kontorova model.
  • Temperature-dependent thermal conductivity and radiation asymmetry do not account for the observed high efficiency.
  • The scalable nature and wide temperature range applicability suggest immediate industrial potential.