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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

2.0K
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?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Thermal Strain01:19

Thermal Strain

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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 Expansion01:22

Thermal Expansion

5.4K
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Updated: Dec 31, 2025

Thermal Measurement Techniques in Analytical Microfluidic Devices
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Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

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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
|January 2, 2020
PubMed
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.