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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Thermal Measurement Techniques in Analytical Microfluidic Devices
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Micro-structured medium with large isotropic negative thermal expansion.

Luigi Cabras1, Michele Brun2, Diego Misseroni3

  • 1Dipartimento di Ingegneria Meccanica e Industriale, Universitá di Brescia, via Branze 38, Brescia, 25123, Italy.

Proceedings. Mathematical, Physical, and Engineering Sciences
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Summary

Researchers developed novel micro-structured materials with tunable thermal expansion, including negative properties. This breakthrough in auxetic materials offers precise control for advanced applications in mechanics and structures.

Keywords:
Poisson’s ratioarchitected materialsmechanical-auxetic thermal-shrinkingmicro-structured mediumnegative thermal expansion

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Area of Science:

  • Materials Science
  • Nanomechanics
  • Micro-mechanics

Background:

  • Tailoring thermal expansion properties is crucial for innovative materials in nano- and micro-mechanics.
  • Auxetic materials offer unique mechanical behaviors that can be exploited for advanced functionalities.

Purpose of the Study:

  • To propose and assess a new class of micro-structured media with tunable thermal expansion (positive, negative, or zero).
  • To establish a direct link between microstructural variables and the effective coefficient of thermal expansion.

Main Methods:

  • Analytical modeling of micro-structured media.
  • Experimental validation of predicted thermal expansion properties.
  • Numerical simulations to confirm theoretical findings.

Main Results:

  • A simple relation was derived, linking effective thermal expansion to two microstructural variables.
  • Theoretical predictions for negative thermal expansion were experimentally and numerically validated.
  • The proposed media exhibit a wide range of tunable thermal expansion.

Conclusions:

  • The developed Mechanical-Auxetic Thermal-Shrinking media offer precise control over thermal expansion.
  • The simplicity of the design facilitates the production of advanced materials.
  • Potential applications span from micromechanical devices to large-scale civil and space structures.