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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 expansion and Thermal stress: Problem Solving01:27

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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?
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...
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Measurements of Strain01:27

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Thermosensation01:43

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Video Experimental Relacionado

Updated: Sep 9, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Sensor de tensión inalámbrico flexible intrínsecamente insensible a la temperatura y altamente sensible

Zekai Huang1, Guirong Wu1,2, Yunyi Hu3

  • 1Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China.

ACS sensors
|September 3, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio presenta un nuevo sensor de deformación flexible que es insensible a los cambios de temperatura, ofreciendo alta sensibilidad y capacidades inalámbricas. Este avance aborda los desafíos clave en el control de la tensión en entornos exigentes.

Palabras clave:
NFC y sus derivadossensores flexiblesalta sensibilidadIones y electronesNo sensible a la temperatura

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Área de la Ciencia:

  • Productos electrónicos flexibles
  • Tecnología de sensores
  • Ciencias de los materiales

Sus antecedentes:

  • El monitoreo de la deformación en entornos dinámicos (por ejemplo, propulsores sólidos de cohetes, baterías, ligamentos humanos) es un desafío debido a la deformación mecánica y las fluctuaciones de temperatura coexistentes.
  • Los sensores de deformación convencionales presentan una deriva térmica significativa, lo que limita su fiabilidad en aplicaciones inalámbricas e implantables.

Objetivo del estudio:

  • Desarrollar un sensor de deformación flexible inalámbrico intrínsecamente insensible a la temperatura y de alta sensibilidad.
  • Para superar las limitaciones de los sensores convencionales en entornos con temperaturas fluctuantes.

Principales métodos:

  • Diseñó un sensor de deformación flexible que combina dos materiales de ingeniería con coeficientes de resistencia de temperatura opuestos.
  • Utilizó tecnología de comunicación de campo cercano para la funcionalidad inalámbrica pasiva.
  • Logró estabilidad térmica autocompensada a través de la ingeniería de materiales.

Principales resultados:

  • El sensor muestra un desplazamiento mínimo de la temperatura (160 × 10−6 °C−1), lo que elimina la necesidad de una calibración externa.
  • Logró un alto factor de calibre de 2415,76 en un amplio rango de tensión (0-80%).
  • Se habilitó la lectura de tensión inalámbrica y sin batería a una distancia de 3 cm.

Conclusiones:

  • El sensor desarrollado ofrece una estrategia generalizable para lograr la invarianza térmica en sensores de deformación flexibles de alto rendimiento.
  • Amplia la utilidad de la detección inalámbrica pasiva en entornos duros y dinámicos.
  • Rendimiento robusto probado en el monitoreo de propulsor de motor de cohete sólido, detección de deformación de la batería de iones de litio y detección de tensión del ligamento de la articulación de la rodilla humana.